The third and last allotropic form of carbon, following diamond and graphite, is C70 fullerene. The name C70 fullerene refers to the fullerene molecule with 70 carbon atoms.
Let's think about the molecule of carbon dioxide. Since we are aware of its chemical formula, CO2, we can infer that each mole of carbon dioxide comprises 6.02 x 1023 molecules.
The Avogadro's constant is a factor that's used to estimate how many particles are present in a specific substance.
The expression for Avogadro's constant in scientific notation is:
6.02214076×10²³ mol⁻¹.
The amount of particles in 1 mole of a substance is determined by Avogadro's constant, a proportionality factor.
It is comparable to 602,252,000,000,000,000,000,000,000 in ordinary units.
In this way, the avogadro constant can be written as 6.022140761023 mol 1 or 602,252,000,000,000,000,000.
One mole of carbon and two moles of oxygen make up one mole of CO2, or 6.023 x 1023 C atoms and 12.04 x 1023 O atoms, respectively. Avogadro's number, which equals 6.023 x 1023, indicates how many atoms or molecules are contained in one mole of a substance. 6.023 x 1023 CO2 molecules make up one mole of carbon dioxide.
To know more about Avogadro constant please click here ; https://brainly.com/question/15989275
#SPJ13
please help me with my homework
5. Identify each of the following as element, compound, homogeneous
mixture, or heterogeneous mixture. Explain your reasoning for each.
a. milk
b. iron nail
c. glass
d. sugar
e. bottled spring water
f. distilled water
g. air
h. alloy bicycle frame
i. propane
i.
baking soda
Milk : Homogenous
glass : Homogenous
sugar : compounds
bottled spring water : Homogenous
distilled water : compounds
air : Homogenous
alloy bicycle frame : Homogenous
propane : compounds
baking soda : Homogenous
When two liquids totally mix, they produce a homogenous combination.
Complete dissolution of a solid in a liquid
When there is no phase difference in a combination, it is said to be homogenous. The composition of a homogeneous mixture is constant and consistent across the whole system.
A mixture of water and ethanol, for instance, is an example of a homogeneous mixture since the two substances are miscible in all amounts.
To know more about homogenous refer to https://brainly.com/question/16938448
#SPJ9
a student analyzes his reaction mixture by tlc. after developing the tlc plate in ethyl acetate, he observes a single spot, with an rf of 0.95. does this indicate that his reaction mixture contains only one compound? what can be done to verify the purity of the sample by tlc? select all answers that apply.
The single spot, with an Rf value of 0.95. observed by the student indicates that his reaction mixture contains only one compound.
The purity of the sample can be verified by checking the single spot using a UV-light.
What is Rf in TLC?Thin-layer chromatography is a form of chromatography in which a thin layer serves as the solid support over which the differet components in the dye are separated.
The Rf value or the retention factor (Rf) is a value used to compare and help identify compounds in a mixture of compounds or dyes separated by thin-layer chromatography.
Mathematically, the Fr value of a compound is calculated as follows:
Rf value = distance traveled by the compound / distance traveled by the solvent front.
A single Rf value indicates a single compound was present.
Learn more about Rf values at: https://brainly.com/question/17751879
#SPJ1
4) A car is speeding along with
5,000 N of force. It
experiences 400 N of friction
and then hits a zombie, which
exerts 500 N of force back
against the car. What is the net force and is it balanced?
The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.
What is net force?The net force is the total of all the forces acting on an object, according to its definition. Mass can be accelerated by net force. Whether a body is at rest or in motion, another force is at work on it. When a system has a lot of forces acting on it, the phrase "net force" is used.
We have given,
Applied force Fa = 5000N
Frictional force Ff = -400N
Force exerted back by zombie Fz = -500N
The net force formula is given by
[tex]F_{Net}[/tex] = F₁ + F₂ + F₃
[tex]F_{Net}[/tex] = 5000 - 400 - 500
[tex]F_{Net}[/tex] = 4100N
Therefore, The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.
Learn more about net force
https://brainly.com/question/14709298
#SPJ9
please help me on this
Answer:
Option A
Explanation:
Because B, C, D, or E are impossible, protons cannot change, electron = protons.
Apply what you've learned about
separating mixtures to explain why as many
particles as possible are allowed to settle
out before the water is passed through
filters.
Answer:We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components. Examples: (a) Tea leaves are separated from tea.
The particles are allowed to settle out at the bottom before the water is passed through to separate the particles of the higher density and recovered from the bottom.
What is sedimentation?Sedimentation is the tendency for the particles to settle out of the fluid content. Then they come to rest against a specific barrier due to their own motion which is in the response to all the forces that are acting on them.
Sedimentation can be described as the opposite process of erosion which is the terminal end where the sediment is transported. Sedimentation allows the particles with different densities which are in the suspended form in water to settle under the gravitational force.
The settled particles from the suspension become sediment, while water treatment is called sludge. When this thick sediment continues to settle, which is assisted by mechanical means is called the process of thickening.
Then you can easily remove the sediment by using a filtration system that contains a water sediment filter.
Learn more about sedimentation, here:
https://brainly.com/question/22443465
#SPJ5
the first arrow in the resonance of the amide is drawn for you. in the second structure, add one curved arrow to show the movement of an electron pair that will result with the positive charge moving to the nitrogen atom. complete the resonance structure by drawing the bond formed by the movement of electrons in the previous step.
When a compound's qualities cannot be fully explained by a single structure, we require more structures. These additional structures are known as resonance structures, and the phenomenon they describe is known as resonance.
Resonance is the term used to describe the phenomena of enhanced amplitude that happens when the frequency of a periodic force is applied (or a Fourier component of it) is equal to or nearly equal to the natural frequency of the system on which it works. In contrast to when the same oscillating force is applied at other, non-resonant frequencies, a dynamic system will oscillate at a higher amplitude when the oscillating force is applied at its resonant frequency.
Resonant frequencies or resonance frequencies of the system are frequencies at which the response amplitude is a relative maximum. Small periodic forces that are close to a resonant frequency of the system can produce large amplitude oscillations in the system due to the storage of vibrational energy.
Learn more about resonance here:
https://brainly.com/question/28318319
#SPJ4
This process happens in such a way that total mechanical energy, equal to the ______ of the kinetic and potential energies, is _______.
This process happens in such a way that total mechanical energy, equal to the sum of the kinetic and potential energies, is conserved.
What is the mechanical energy process?Potential and kinetic energy are sources from which mechanical energy is generated by converting them into power. Turbines that are powered by steam, water, wind, gas, or liquid fuels are a few examples of this. Before being employed as power, machines are frequently used to convert various sources of energy.
As long as there is no energy loss via friction, the system's mechanical energy remains constant. When the speed increases, the energy would become kinetic energy. As long as there is no energy loss via friction, the system's mechanical energy grows.
When an immovable item starts moving, mechanical energy is converted into kinetic energy.
learn more about kinetic energy refer
https://brainly.com/question/25959744
#SPJ4
Why does oxygen bond with hydrogen in the ratio 1:2 (and how can you apply this concept to other element compounds)?
Answer:
This is because oxygen requires two electrons to gain stability, while hydrogen has only one olectron, therefore two hydrogen atoms are required
what is the formula for radiant to chemical energy to make glucose
The radiant energy that is absorbed by the plant in the process of photosynthesis is stored in the plant in the form of chemical energy contained in sugars.
What is photosynthesis?The term photosynthesis has to do with the process by which there is a combination of water and carbon dioxide in the plant such that the products that are formed are sugar and oxygen. The oxygen is released back into the environment.
We know that radiant energy from the sun is what acts as the catalyst that makes the reaction possible. The combination occurs in the chloroplasts of the plant cells .
Learn more about photosynthesis:https://brainly.com/question/1388366
#SPJ1
Consider this skeleton equation:
Mg + Mn2O3 → MgO + Mn
Which of the following is the correct, balanced chemical equation?
Answer:
3Mg + Mn2O3 --> 3MgO + 2Mn
Explanation:
To know whether an equation is balanced, make sure to count how many atoms of a specific element are in each side.
In these options, the only one that has the same amount on each side is option 2.
On the reactant side, we have:
3 Mg, 2 Mn, and 3 O
On the product side, we have:
3 Mg, 2 Mn, and 3 O
If you have a coefficient in front of the molecule, that means that there is that amount of each element. For example 3 MgO, there is 3 Mg and 3 O.
If you have a subscript (the small number) after the element, that means there is specifically that amount of atoms of that element. For example Mn2O3, there is specifically 2 Mn and 3 O.
what is the difference between ""drying the organic layer with sodium sulfate"" and ""evaporating the organic solvent?"" (hint: do these imply the same physical/chemical process? how are they the same or different?)
The difference between drying the organic layer and solvent evaporation is explained below.
When an organic component is extracted, there is always the possibility of traces of water or moisture remaining in the organic layer. To eliminate water from the organic layer, the organic layer is frequently treated with sodium sulfate, a process known as drying the organic layer. The organic layer is concentrated once it has been freed of water by evaporating the organic solvent. There is always some water remaining in the organic layer after aqueous extractions. Adding anhydrous sodium sulfate for drying the organic layer, eliminates this water by creating sodium sulfate hydrate, which is likewise a solid and so easily filtered away.
Solvent evaporation is the process of emulsifying polymer in aqueous phase and dispersing it in a volatile solvent such as dichloromethane, chloroform, or ethyl acetate. The solvent is then evaporated using high heat, vacuum, or continuous stirring. By placing the solution in an open container, solvent evaporation occurs (an Erlenmeyer, evaporating dish, beaker, vial). The solvent is boiled out by placing the container on a heat source (steam bath, hot plate, heating mantle, sand bath).
Learn more about drying the organic layer here:
https://brainly.com/question/13692663
#SPJ4
A specialty food store received orders for 725 fruit baskets during the 7-day period leading up to a major holiday. According to the fruit basket recipe shown, how many strawberries will the specialty store need to fulfill all 725 orders? 1 fruit basket = 4 oranges (O) + 3 apples (A) + 2 pears (P) + 6 strawberries (S) 1 fruit basket = 4O + 3A + 2P +6S ⟶ O4A3P2S6
The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
What is fruit basket?Fruit basket is defined as a gift basket filled with a variety of fruits.
A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.
As one basket has 6 strawberries.
So, for completing 725 order we need
= 725 / 6
= 120.8 = 120 strawberries
Thus, the fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
To learn more about fruit basket, refer to the link below:
https://brainly.com/question/26073272
#SPJ1
which observations support boyle's law? select one or more: the product of a gas's pressure and volume is constant. pressure and volume both increase at the same rate. when volume of a gas is decreased, its pressure will increase. as gas pressure decreases, its volume increases.
Boyle’s law is supported by the following options - (a) product of pressure and volume is constant, (c) decrease in volume leads to increase in pressure, and (d) decrease in pressure leads to increase in volume.
Boyle's law, an experimental gas law, states that as a container's capacity rises, a gas's pressure tends to drop.
According to Boyle's law, in a closed system with constant temperature and gas volume, the absolute pressure a given mass of an ideal gas exerts is inversely proportional to the volume it occupies.
According to this, the volume of a gas is inversely proportional to the pressure it exerts at a given temperature. In other words, a gas will condense to fit into an enclosed area when it is poured into it, but the pressure it exerts on the container will rise.
Therefore, (a) the product of the pressure and volume of a gas is constant, (c) The pressure will increase with a decrease in the volume of the gas, and (d) the pressure decreases with an increase in the volume of the gas.
Learn more about Boyle’s law here:
https://brainly.com/question/1437490
#SPJ4
For these equations, different acids have been used so you will need to think carefully about how to balance them.
1 In a titration, 20 cm3 of 1.0 mol dm-3 sulphuric acid, H2SO4, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
2 In a titration, 20 cm3 of 1.0 mol dm-3 nitric acid, HNO3, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
3 In a titration, 20 cm3 of 1.0 mol dm-3 phosphoric acid, H3PO4, reacted with 25 cm3 of NaOH. What was the concentration of the sodium hydroxide?
4 In a titration, 25.0 cm3 of 0.5 mol dm-3 sulphuric acid, H2SO4, reacted with 25 cm3 of KOH. What was the concentration of the potassium hydroxide?
The concentration of the given solutions based on the titration is given below:
1. concentration of NaOH is 1.6 mol/dm³
2. concentration of NaOH is 0.8 mol/dm³
3. concentration of NaOH is 2.4 mol/dm³
4. concentration of KOH is 1.0 mol/dm³
What is a titration reaction?A titration reaction is a reaction in which a solution of known concentration and volume is reacted with a given volume of a solution of unknown concentration in order to determine the unknown concentration of the second solution.
1. Volume of H₂SO₄ = 20 cm³
The concentration of H₂SO₄= 1.0 mol/dm³
Volume of NaOH reacted = 25 cm³
Mole ratio of NaOH and H₂SO₄ = 2 : 1
The concentration of NaOH = 20 * 1.0 * 2/25
The concentration of NaOH = 1.6 mol/dm³
2. Volume of HNO₃ = 20 cm³
The concentration of HNO₃= 1.0 mol/dm³
Volume of NaOH reacted = 25 cm³
Mole ratio of NaOH and HNO₃ = 1 : 1
The concentration of NaOH = 20 * 1.0 / 25
The concentration of NaOH = 0.8 mol/dm³
3. Volume of H₃PO₄ = 20 cm³
The concentration of H₃PO₄ = 1.0 mol/dm³
Volume of NaOH reacted = 25 cm³
Mole ratio of NaOH and H₃PO₄ = 3 : 1
The concentration of NaOH = 20 * 1.0 * 3 / 25
The concentration of NaOH = 2.4 mol/dm³
4. Volume of H₂SO₄ = 25 cm³
The concentration of H₂SO₄= 0.5 mol/dm³
Volume of KOH reacted = 25 cm³
Mole ratio of KOH and H₂SO₄ = 2 : 1
The concentration of KOH = 25 * 0.5 * 2 / 25
The concentration of KOH = 1.0 mol/dm³
Learn more about titration at: https://brainly.com/question/2496335
#SPJ1
trail, d., savage, p.s., moynier f. (2019) experimentally determined si isotope fractionation between zircon and quartz. geochim. cosmochim. acta, 260, 257-274.
Zircon and detrital quartz have the potential to provide information regarding scalar changes to the Earth's weathering processes and silicon isotope composition. Due to the fact that there are currently few data on the Si isotope equilibrium fractionation of minerals, determining the source melt Si isotope composition from out-of-context minerals is difficult.
The term "quartz" comes from the Polish words "kwardy" and "twardy," both of which imply "hard" in English. Quartz is an igneous rock made up of silicon and oxygen atoms in a continuous structure called silicon-oxygen tetrahedra (SiO4). The ultimate chemical formula of quartz is SiO2, which is recognized in science as the result of the sharing of each oxygen atom between two tetrahedra atoms. In terms of mineral abundance in the continental crust of the earth, quartz is second only to feldspar. The two types of quartz which are known as regular alpha quartz and high-temperature beta quartz are both chiral materials. All of the alpha-to-beta quartz transformations take place at temperatures below 573 degrees Celsius.
Learn more about Quartz here:
https://brainly.com/question/12822959
#SPJ4
enter a balanced compleenter a balanced complete ionic equation for na3po4(aq) fecl2(aq)→fe3(po4)2(s) nacl(aq)te ionic equation for lioh(aq) hno3(aq)→h2o(l) lino3(aq)
The balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
What are the net ionic equations?The net ionic equation is an equation of a chemical reaction that expresses only elements, ions, or compounds, that directly participated in that chemical reaction.
We can write a balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The complete ionic equation can be written for reaction of Na₃PO₄ and FeCl₂:
6Na⁺ (aq) + 2PO₄³⁻ (aq) + 3 Fe³⁺ (aq) + 6Cl⁻ (aq) → Fe₃(PO₄)₂ (s) + 6 Na⁺ (aq) + 6Cl⁻ (aq)
The balanced chemical equation for HNO₃ and LiOH:
HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)
The complete ionic equation for HNO₃ and LiOH::
H⁺(aq) + NO₃⁻ (aq) + Li⁺(aq) + OH⁻ (aq) → H₂O (l) + Li⁺(aq) + NO₃⁻ (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
Learn more about the net ionic equation, here:
brainly.com/question/15466794
#SPJ1
a 0.897g sample containing chloride ion is treated with excess lead (ii) nitrate. the lead (ii) chloride precipitated is filtered into a filter paper that weighed 0.923g. after washing and drying the precipitate filter paper weighed 2.686g. calculate the following:
The reaction between a sample containing chloride ions with excess Lead (II) nitrate leads to the formation of [tex]PbCl_2[/tex] in the form of precipitate.
a) The precipitate formed in the reaction of excess Lead (II) nitrate and chloride ions is [tex]PbCl_2[/tex].
Total ionic is [tex]2Cl^- + Pb(NO_3)_2 \rightarrow PbCl_2 (ppt) + 2NO_3^-[/tex]
Net ionic is [tex]2Cl^- + Pb^+ \rightarrow PbCl_2 (ppt)[/tex]
b) Excess Lead (II) nitrate was used in the reaction to precipitate each and every chloride ion.
c) The total mass of [tex]PbCl_2[/tex] = 2.686 - 0.923 = 1.763g
Molar mass of [tex]PbCl_2[/tex] = 278g/mol
Therefore, moles of [tex]PbCl_2[/tex] = 1.763/278 = 6.342 x [tex]10^{-3}[/tex]
d) No. of moles of chloride = 2 x moles of [tex]PbCl_2[/tex] = 12.684 x [tex]10^{-3}[/tex]
Mass of chloride = 35.5 x 12.684 x [tex]10^{-3}[/tex]
Mass of chloride = 0.45g
e) % of chloride = 0.45/0.897 x 100 = 50.2%.
f) No, the mass of the sample is not same as the mass of the precipitate formed during the reaction.
The complete question is:
A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. After washing and drying the precipitate+ filter paper weighed 2.686g. Calculate the following:
a) Write the total ionic and net ionic equation for the reaction producing the precipitate:
total ionic:
net ionic:
b) Why was excess lead (II) nitrate used in the above procedure?
c) moles of lead (II) chloride formed:_______
d) Moles of chloride present in the sample__________ and Mass of chloride present in the sample _________
e) % of chloride in the sample: ___________
f) Is the mass of the sample same as the mass of precipitate? _________
Learn more about Lead (II) nitrate reactions here:
https://brainly.com/question/26980915
#SPJ4
A sample of copper has a mass of 50 g and a volume of 5 cm^3. What is its density?.
draw a three-dimensional orbital representation for each of the following molecules, indicate whether each bond in it is a σ or π bond, and provide the hybridization for each non-hydrogen atom
a) CH2O
The carbon atoms are present in sp2 hybridization
b) CH2=CH-CH=CH2
All carbon atoms are present in sp2 hybridization
c) CH2=C=C=CH2
The 2,3-carbons are in sp hybridization and the remaining carbons are in sp2 hybridization.
The idea of combining two atomic orbitals to create a new class of hybridized orbitals is known as hybridization in chemistry. This mixing typically produces hybrid orbitals with completely distinct energies, geometries, etc. Hybridization primarily involves atomic orbitals at the same energy level. However, if an orbital has equivalent energy, it can participate in this process, as can an orbital that is partially filled.
On the other side, we may claim that the idea of hybridization is an expansion of the valence bond theory and that it aids in our understanding of how bonds are formed, how they are energetically, and how long they are.
When two atomic orbitals in a molecule combine to generate a hybrid orbital, the energy of the orbitals of the individual atoms is redistributed to give orbitals of equivalent energy. Hybridization is the name of this procedure.
Learn more about Hybridization here:
https://brainly.com/question/14140731
#SPJ4
a balloon originally had a volume of 4.39 l at 44 °c and a pressure of 729 torr. the balloon must be cooled to °c to reduce its volume to 3.62 l (at constant pressure).
The final temperature must be 273 K or 0 °C to reduce the volume to 3.62 L.
Let's solve the problem by using Charles Law which states that at constant temperature and pressure, the quotient of the volume and the temperature will always have the same value.
Now , mathematically, we can write as
[tex]\frac{V}{T}[/tex] = K
For initial and final states, the above equation can be written as
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
Since, we are given
V1 = 4.39 L
T1 = 44 °C = 317 K (being O°C = 273 K)
V2 = 3.78 L
T2 = ?
Substituting the abovementioned values in Charles's law we get:
[tex]\frac{4.39L}{317K}[/tex] = [tex]\frac{3.78L}{T2}[/tex]
Now solving the above equation.
[tex]T_{2}[/tex] x [tex]\frac{4.39L}{317k}[/tex] = 3.78L
[tex]T_{2}[/tex] = 3.78L ÷ [tex]\frac{4.39L}{317K}[/tex]
[tex]T_{2}[/tex] = 273K i.e. 0°C
Hence, the final temperature must be 273 K or 0 °C to reduce the volume to 3.62 L.
If you need to learn more about temperature click here:
https://brainly.com/question/26141817
#SPJ4
which one of edwin hubble’s findings support the big bang theory
Answer:
There are billions of galaxies in the universe, not just one.
The universe formed from a central point.
Most galaxies in the universe are moving away from Earth.
Explanation:
If 1.85 grams of Mg(OH)2 reacts with 3.71 grams of HCl how much MgCl2 is produced?what is the limiting reactant? 1Mg(OH)2+2HCl=1MgCl2+2H2O
Answer
Mg(OH)2 is the limiting reactant
Mass of MgCl2 produced = 3.02 g
Explanation
Given: The balanced chemical equation
mass of Mg(OH)2 = 1.85 g
mass of HCl = 3.71
Solution
Mg(OH)2
[tex]1.85g\text{ Mg\lparen OH\rparen}_2\text{ x }\frac{1\text{ mol Mg\lparen OH\rparen}_2}{58,3197g}\text{ x }\frac{1\text{ MgCl}_2}{1\text{ Mg\lparen OH\rparen}_2}\text{ = 0.031 mol MgCl}_2[/tex]HCl
[tex]3.71g\text{ HCl x }\frac{1\text{ mol HCl}}{36,458g}\text{ x }\frac{1\text{ MgCl}_2}{2\text{ HCl}}\text{ = 0.051 mol MgCl}_2[/tex]Therefore Mg(OH)2 is the limiting reactant.
Calculation of MgCl2 mass
[tex]0.031\text{ mol MgCl}_2\text{ x }\frac{95,211g}{1\text{ mol MgCl}_2}\text{ = 3.02 g}[/tex]State the main points of Dalton’s atomic theory. Which parts were found to be erroneous? Explain why they are
The main points of Dalton's atomic theory is Atoms are not indivisible and all atoms of an element are not identical.
What are the Postulates of Dalton's atomic theory?Atoms are the minuscule, indivisible building blocks of all stuff.
A certain element's atoms are all the same mass, size, and other characteristics. Nevertheless, the characteristics and mass of atoms from various elements varies.
Atoms are eternal and cannot be generated or destroyed. Atoms also can not be separated into smaller particles.
Compounds can be created by combining atoms of various elements in specific whole-number ratios.
In chemical reactions, atoms can be joined, separated, or rearranged.
What is the drawbacks of Dalton's atomic theory?The fact that an atom may be further divided into protons, neutrons, and electrons disproves the idea that it is indivisible. The smallest particle that participates in chemical processes is an atom, nevertheless. Dalton asserts that the atoms of the same element are identical in every way.
Learn more about Dalton's atomic theory here :
brainly.com/question/5256778
#SPJ13
Name: PbCl4
A. lead chloride
B. lead tetrachloride
C. lead(IV) chloride
D. lead chloride (IV)
Answer:
C. Lead(IV) Chloride
Explanation:
Because PbCl4 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis. This is placed directly after the metal.
The name of PbCl₄ is lead (IV) chloride. Therefore, option C is correct.
Lead (IV) chloride (PbCl₄) is a hypothetical compound, it does not exist under normal conditions. The highest oxidation state that lead typically exhibits is +4, but it is highly unstable and tends to be disproportionate to lower oxidation states.
Lead commonly forms compounds such as lead (II) chloride (PbCl₂), where lead has an oxidation state of +2. In PbCl₂, each lead atom is bonded to two chloride ions. This is the most stable and commonly observed form of lead chloride.
Learn more about lead, here:
https://brainly.com/question/6529765
#SPJ6
Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Which statement best describes these three components of air?
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
Oxygen, nitrogen, and carbon dioxide can be classified as elements.
Answer: its thee 3rd one I'm pretty sure.
Explanation:
Answer:
C
Explanation:
They are chemically bonded is the truest of all
3. From a stock solution of Dye A, a series of four dilutions were made. The concentration and absorbance
data are given below, beginning with a calibrated blank of distilled water. Plot a Beer-Lambert law graph of absorbance versus concentration.
Concentration
Absorbance
0.000 (blank)
4
0.00 M
1.00 x 10-5 M
0.270
2.00 x 10-5 M
0.550
3.00 x 10-5 M
0.810
4.00 x 10-5 M
1.100
Thus mass of dye A = 10.24 mg/L
Plot Beer-Lambert law
Beer-Lambert law states that absorbance of an analye (here, dye A) is directly proportional to its concentration (C) and pathlength (l) of the solution
i.e. A \propto C*l
or A = \epsilonCl
where \epsilon = proportionality constant and is called absorptivity coefficient. It is characteristic for an analyte at a given wavelength, unit = M-1cm-1
Thus above equation can be compared with a straight line equation as y = mx+c
where y = absorbance, x = concentration and \epsilon = slope, c = intercept = 0 for absorbance vs concentration plot.
b. Calculate the slope (m) of graph:
for absorbance vs concentration plot.
The given data was plotted and fitted to a liner fit that gave the equation as:
y = 27335 x
slope of the line = 27335
thus \epsilon = 27335 M-1cm-1
c. Concnetration using Beer-Lambert plot:
Absorbance of dye A in Sports drink, A = 0.700
point absorbance of 0.007 on y-axis and interpolate to the linear fit. Check the corresponding value at x-axis as follows:
the corresponding line meets x-axis at 0.00002 + 4-squares
In the graph drawn, 7 squares in x-axis = 0.00001
thus 4 squares on x-axis = 0.00001*4/7 = 5.71*10-6
thus for y = 0.700 the corresponding x-axis reads = 0.00002+5.71*10-6
or C = 2.57*10-5 M
d. Concnetration of dye A using slope of fitted line:
Absorbance of dye A in Sports drink, A = 0.700
substituting the absorbance in the linear fit equation we can calulate the concentration as:
0.700 = 27335*C
C = 0.700/27335
C = 2.56*10-5 M
e. Mass of dye A in mg/L
Molar mass of dye = 400 g/mol
Concentration (molarity) of dye A = 2.56*10-5 M
1 M = number of moles of solute present in 1 L of solution volume
number of moles = mass / molar mass
\therefore Molarity = mass of solute/(molar mass of solute*volume of solution)
for solution volume = 1L
Molarity = mass of solute/molar mass of solute
rearranging this we get:
mass of solute = (Molarity*molar mass of solute) g/L
mass of dye A = 2.56*10-5* 400 g/L
m = 0.01024 g/L
1 g = 1000 mg
Thus mass of dye A = 10.24 mg/L
To learn more about Molar mass visit:https://brainly.com/question/12127540
#SPJ1
suppose you performed a titration of a weak acid and you found that the equivalence point occurred at 11.38 ml of added naoh. at what volume would you use the ph to determine the pka of the acid? enter your answer numerically to three significant figures.
At volume 6.78ml, pH will be equal to pKa of the acid.
According to the Henderson- Hasselbach equation,
pH= pKa + log {A-}/ {HA}
where {A-} is the concentration of conjugate base and
{HA} is the concentration of weak acid
At the equivalence point, the volume of base added is just enough to exactly neutralize all the acid.
At one half of this volume of added base, called the half equivalence point, enough has been added to neutralize half of the acid. Since, half of the acid reacted to form A-, the concentration of A- and HA-, at the half equivalence point are the same.
ph= PKA+log1
pH= pKa (log1=0)
Therefore, V eq = 13.57ml
V 1/2 eq= 13.57/2
=6.78ml
Hence, at volume 6.78ml, pH will be equal to pKa of the acid.
To learn more about volume, click:
https://brainly.com/question/463363
#SPJ4
Determine the temperature Kelvin of CO2(g) having a root mean square velocity of 4.37 * 10 ^ 2 m/s
Answer:
The temperature is 336.9K.
Explanation:
To calculate the temperature of CO2, it is necessary to replace the values of CO2 molar mass (0.044kg/mol), gas constant (R=8.314J/mol.K) and in this case the root mean square velocity (4.37x10^2m/s) in the root mean square velocity formula:
[tex]\begin{gathered} V_{rms}=\sqrt{\frac{3*R*T}{m}} \\ 4.37*10^2\frac{m}{s}=\sqrt{\frac{3*8.314\frac{J}{mol*K}*T}{0.044\frac{kg}{mol}}} \\ (4.37*10^2\frac{m}{s})^2=\frac{3*8.314\frac{J}{mol*K}*T}{0.044\frac{kg}{mol}} \\ 190,969\frac{m^2}{s^2}=566.86\frac{J}{kg*K}*T \\ \frac{190,969\frac{m^2}{s^2}}{566.86\frac{J}{kg*K}}=T \\ 336.9K=T \end{gathered}[/tex]So, the temperature is 336.9K.
advanced study assignment (asa) a student reacts a 0.050g sample of magnesium in excess hydrochloric acid in order to produce hydrogen gas collected at room temperature (23.2°c). 48.6 ml hydrogen gas is collected in an eudiometer tube with water initially at 20.0°c. 1. how many moles of magnesium are reacted? moles of magnesium reacted: 2. from the balanced chemical equation, how many moles of hydrogen gas are created? moles of hydrogen gas created: 3. if the pressure inside the eudiometer tube is equalized to atmospheric pressure (1.00 atm), what is the pressure of only the hydrogen gas in the tube (without water vapor)? pressure of hydrogen gas only: 4. considering that this reaction was not performed at stp, calculate the volume of hydrogen gas that would have been produced at stp. (hint: use equation 1) volume of hydrogen gas at stp: 5. using the information you calculated, what is the molar volume at stp for hydrogen gas? molar volume of hydrogen gas: 6. given the known molar volume of an ideal gas at stp, calculate the percent error in your experiment. percent error:
Reaction between 0.050g Magnesium and HCl in excess gives the following results.
Magnesium interacts with hydrochloric acid (HCl), and this presentation may be used to show a single replacement reaction, the typical interaction of metals with acid, or the production of hydrogen gas.
A eudiometer is a laboratory tool used to gauge how much a gas mixture expands or contracts after undergoing a physical or chemical change.
Magnesium is a shiny gray solid whereas HCl is a colourless aqueous solution with a pungent odour. On a reaction between these two, single displacement of Cl from HCl to [tex]MgCl_2[/tex] occurs.
Given:
Mass of Mg = 0.050g
Molar mass of Mg = 24g/mol
Calculations:
(a) No. of moles of Mg = 0.050 / 24 = 0.0021 moles of Mg reacted
(b) [tex]Mg (s) + 2HCl (l) \rightarrow MgCl_2 (s) + H_2 (g)[/tex]
As moles of Mg reacted = moles of [tex]H_2[/tex] produced
Therefore, No. of moles of [tex]H_2[/tex] produced = 0.0021 moles
(c) Vapour pressure of water at 20℃ is 17.5 torr = 0.023atm
Pressure of only [tex]H_2[/tex] gas = 1 – 0.023 = 0.977atm
(d) Using P1V1/T1 = P2V2/T2,
0.977 x 48.6 / 293 = 1 x V2 / 273
Volume of [tex]H_2[/tex] gas at STP = 44.24mL
(e) Molar volume of [tex]H_2[/tex] gas at STP = 44.24 / 0.0021 = 21.067L/mol
(f) Percent error = 22.4 – 21.067 / 22.4 x 100 = 5.95%
Learn more about Magnesium and HCl reactions here:
https://brainly.com/question/14624069
#SPJ4
Place one of the 50 kg boxes in the center of the track. Move the friction bar to “None”. Set the Applied Force box by entering 100 Newtons. You will start the force at the same time you start the stopwatch. You can do that by using the return key on the Simulation and the cursor on the stopwatch.
The mass of the cart needs to accelerate at 0.75 m/s² is 166.6kg.
The net force on an object is zero but its velocity and direction of motion remain unchanged. The net force is the sum of all horizontal or vertical forces. When the box is not moving, the friction plus the applied force is zero, so the net force is zero. The answer is zero. An object moving at constant velocity has zero acceleration, so the net force is zero.
Newton's second law of motion can be observed by comparing the acceleration of a car and a truck after the same force is applied. It's easy to see that the car accelerates faster than the truck after pushing the car and the truck with equal force. Friction is the force that resists movement between contact surfaces. Friction works in our favor and against us.
Learn more about Newtons' law here:-https://brainly.com/question/25545050
#SPJ1