Therefore, 0.25 moles of unit cells will be present in 58.5 g.
How many atoms make up a mole of sodium chloride?Therefore, 6.0231023 6.023 10 23 molecules make up 1 mole of NaCl. The total number of atoms in 1 mole of NaCl N a C l is twice Avogadro's number, or 6.0231023 6.023 10 23 because each molecule of the salt has two atoms (Na and Cl).
How can you determine an ion's mass?Similar to covalent compounds, the formula mass of an ionic compound is determined by adding the average atomic masses of all the atoms in the compound's formula.
Calculation:1 mole of NaCl
Avogadro's number, or 6.0231023
0.25 moles of unit cells will be present in 58.5 g.
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what is the percent yield if 200 g of a product is produced during a reaction that has the potential of producing 250 g?
The answer for the percentage yield is 80%.
What is percentage yield?
Recovery is the ratio of actual recovery to theoretical recovery. It is calculated by dividing the experimental yield by the theoretical yield and multiplying by 100%. If the actual and theoretical yields are equal, the yield rate is 100%. Yields are usually less than 100% because actual yields are often lower than theoretical. This may be due to incomplete or competing reactions and sample loss during recovery. Recoveries can exceed 100%. This means that more samples were recovered from the reaction than expected. This can occur when other reactions that form the product occur. Another potential source of error is overage caused by incomplete removal of moisture or other contaminants from the sample. Yield is always positive.
Therefore, The answer for the percentage yield is 80%.
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Select all that apply. The discoveries of niels bohr were: quantum energy emissions charge on the electron orbits of electrons static electricity.
Orbits of electrons, -quantum energy emissions and -relationship between outer shell and chemical properties.
What is electron?electron is a subatomic particle with a charge of sub-atomic electricity found in all atom and is the primary carrier of electricity in solid.
Neil Bohr was the first who explained that electrons moves around the nucleus in the separate orbits or shells in an atom. The properties of an element is determined by the number of electrons in outer shell. He also discovered that electrons can only be in a particular orbits of fixed energy and when electrons allowed to jump from one orbit to another, they absorbed or emitted electromagnetic radiation.
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Complete Question
Select all that apply. The discoveries of Niels Bohr were:
- orbits of electrons
-charge on the electron
- quantum energy emissions
- static electricity
- relationship between outer shell and chemical properties
how many grams of ch3ohch3oh must be added to water to prepare 225 ml of a solution that is 2.5 m ch3ohch3oh ?
18.0121 grams of CH₃OH must be added to water to prepare 225ml of a solution that is 2.5 m CH₃OH.
Molarity of the solution is defined as the number moles of the solute present in one liter of the solution. Molarity is calculated from the equation,
M = No. of moles of solute / Volume of the solution in terms of liter.
Volume of solution given is 225 ml. As molarity is expressed in moles per liter.
Volume of solution = 0.225 L
Calculate the mole of CH₃OH by the expression of molarity,
225ml × 2.5 mole/1000 ml = 0.562 moles of CH₃OH .
Now convert 0.175 moles by multiplying molar mass of the solution. So,
0.562 moles × 32.05g of CH₃OH /1mole CH₃OH = 18.0121 grams
The volume equals to 18.0121 grams of CH₃OH.
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Assuming that no new water molecules entered the glass while the water was freezing, would you say that frozen water (ice) takes up more space than liquid water, less space, or about the same?
Answer:
Frozen water(ice) indeed takes up a larger volume than water in liquid state.
Explanation:
This is because when water liquid turns into a solid, energy is absorbed hence it gets cooler, the bonds are strengthen and expands to its maximum.
this means that the structure changes when water turns to ice, from the semi random arrange in liquid state to lattice in ice. this expansion between the molecules have alot of space between it, the molecules are less compact.
Since the molecules are less compact, ice is therefore less dense than water, hence it floats on water and not sink.
And this almost means that ice increases in volume by approximately 9% than its initial liquid water.
When red, green, and blue light are combined in equal proportions the result is? Yellow light Green light Black light White light O Ultraviolet radiation
Answer: white light
Explanation:
because complementary colors... but dont expect the same thing to work with paint. obviously
Photosynthesis would occur in which of the following organisms?
frogs
tree trunks
honeybees
grass
Answer:
grass
Explanation:
only the grass would actively have photosynthesis occur. frogs and honeybees do not use photosynthesis to produce "food". tree trunks are not the part of the organism that performs photosynthesis.
Answer: Grass!
Explanation: Grass produces food for itself through a process called photosynthesis, Just like trees. Leaves soak up light Thats what the word photo means In "Photosynthesis" And then the light soaked up from the leaves and a chemical occurs called chlorophyll
Describe what happens to the freezing point when tin is added.
Answer:
The freezing point of a substance is the temperature at which it changes from a liquid to a solid. When tin is added to a substance, it can lower the freezing point of the substance. This is known as a colligative property of matter, which refers to the ability of certain substances, such as solutes, to alter the physical properties of a solvent (such as the freezing point or boiling point) without changing the chemical composition of the solvent.
In the case of tin, when it is dissolved in a solvent, it can disrupt the interactions between the solvent molecules, making it more difficult for the solvent to form a solid. As a result, the freezing point of the solvent is lowered. This effect is more pronounced when the concentration of the solute is higher.
It's important to note that the freezing point depression caused by tin (or any other solute) is dependent on the concentration of the solute and the nature of the solvent. Different solvents will have different freezing points, and the freezing point depression caused by a given solute may vary depending on the solvent used.
Explanation:
In a single displacement reaction between al2s3 and li, what products will form and why?.
Lithium Sulphide ([tex]Li_{2}[/tex]S)and Al (Alumunium) will be formed In a single displacement reaction between al2s3 and li.
What is a single displacement reaction?
A single exchange reaction, also called a single substitution reaction, is a reaction in which one element in a compound is replaced by another. The starting materials are always pure elements such as pure zinc metal or hydrogen gas and aqueous compounds. When an exchange reaction occurs, a new aqueous compound and another pure element are produced as products.
Therefore, Lithium Sulphide ([tex]Li_{2}[/tex]S)and Al (Alumunium) will be formed In a single displacement reaction between al2s3 and li.
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What are the values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°c?.
Answer: nose
Explanation:sorry
Calculate the kinetic energy of the cart at the point shown below. It has a mass of 0.5 kg, is 2.0 m high, and is moving at a velocity of 1.5 m/s. Round your answer to the hundredths place (two the decimal places).
Answer:
this is ez 123
Explanation:
PLEASE HELP!!! LOTS OF POINTS!!!
Number of valence electrons:
Barium: 2
Phosphorus: 5
Oxygen: 6
b) Based on the number of valence electrons, write the monatomic ion (symbol with charge) each element may form.
c) Phosphorus and oxygen can bond to form a polyatomic ion. Write the formula of for this ion and be sure to include the ion charge.
d) Using the monatomic ions you listed above in (b), the polyatomic ion from (c), write the formulas for the three ionic compounds these ions could form.
Answer: oxygen needs two take away- two rings
phosphorus needs three taken away- three rings
barium needs two added- six rings
oxygen and barium are the same.
Explanation:
place the best reagent in the bin for each of these reactions involving cyclohexylmethanol.
The best reagent in the bin for each of these reactions involving cyclohexylmethanol to cyclohexyl methyl bromide is NaBr.
The reagent used in the reaction of the cyclohexylmethanol to cyclohexyl methyl bromide is NaBr. the reaction is given as follows :
cyclohexylmethanol + NaBr ------> cyclohexyl methyl bromide
The reagent is used in the chemical reaction in order to find out the the another substances if it is present. A reagent is a substance is used to perform the laboratory test. the reagent is used to perform the above reaction is NaBr.
Thus, NaBr is the reagent used in cyclohexylmethanol to cyclohexyl methyl bromide.
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Oxygen can be produced in the chemistry lab at a low temperature if mixed with manganese dioxide, which acts as a catalyst in the reaction. The chemical equation for the production of oxygen using potassium chlorate is:.
The process of 2KClO3 → 2KCl + 3O2 exhibits both oxidation-reduction and breakdown.
When a specie is broken down into its component parts, it is said to be decomposing. KClO3 was converted into KCl and O2 during this process. Because of this, the reaction is categorized as one of breakdown.
It is also an oxidation-reduction reaction since the oxidation number of the chlorine atom was decreased from +5 to -1 while the oxidation number of the oxygen atom was enhanced from -2 to zero.
So, It's important to keep in mind that a reaction can only be a combustion if oxygen is one of the reactants.
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A layer of ethyl alcohol (n = 1. 361) is on top of water (n = 1. 333). To the nearest degree, at what critical angle relative to the normal to the interface of the two liquids is light totally reflected?.
The angle relative to the normal interface of the two liquids at which the light is totally reflected is 78 degrees.
What is Snell's law?
The incident rays' landing point and the angle it forms with the refracted ray—not to mention the normal line that is dropped on the plane perpendicularly—create the point of refraction. In contrast to reflection, the medium through which the light rays are flowing produces a significant change in refraction. The refractive indices highlight Snell's Law's dependence on the medium.
Snell's Law, also referred to as the Law of Refraction, is an equation that connects the angles of incident and transmitted light at the meeting point of two dissimilar media. All materials and phases of matter are subject to Snell's Law.
the refractive index of the ethyl alcohol =1.361
the refractive index of the water =1.333
According to Snell's Law of refraction;
Ф=78
Therefore, we can conclude that the angle relative to the normal interface of the two liquids at which the light is totally reflected is 78 degrees.
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Which changes always happen during a fission reaction?(1 point)
What happens during a fission reaction is that matter is converted to energy.
What is fission?We define the term fission as the kind of reaction that involves the breaking of the nucleus of an atom and then there would be a release of energy. There are various kinds of nuclear reactions that we have but the most common types of nuclear reactions are the fission and the fusion reaction.
In the fusion reaction we have the combination of two or more lighter nucleus so as to produce a heavier nucleus while in the case of the fission reaction the nucleus would have to be broken up so that energy can be released in the process.
Thus, we see that the total mass on the left hand side may not be the same as the total mass on the left hand side because some of the mas is converted to energy.
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Missing parts;
Which change occurs during a nuclear fission reaction?
(1) Covalent bonds are converted to ionic bonds.
(2) Isotopes are converted to isomers.
(3) Temperature is converted to mass.
(4) Matter is converted to energy
Which of these is a renewable resource found in Nevada?
A.
gravel deposits
B.
petroleum products
C.
zinc metal
D.
geothermal energy
Answer:
D.geothermal energy
Explanation:
The State of Nevada has abundant solar, wind, and biomass energy sources, but has more potential for geothermal energy production than any other state.
The normal boiling point of Substance A is 129.4 °C. Given that the vapor pressure of Substance A is 481.9 torr at 8.5 °C, calculate the molar enthalpy of vaporization to the nearest kJ/mol
Problem #8: A 5.00 L flask contains 3.00 g of mercury. The system is at room temperature of 25.0 °C. By how many degrees should we increase the temperature of the flask to triple the mercury vapor pressure. The enthalpy of vaporization for mercury is 59.11 kJ/mol?
Solution:
1) Let us use the Clausius-Clapeyron Equation:
with the following values:
P1 = 1 T1 = 298 K
P2 = 3 T2 = x
3) Set up equation with values:
ln (3/1) = (59110 / 8.31447) (1/298 minus 1/x)
1.0968 = 7109.2926 (1/298 minus 1/x)
1.0968 = 23.8567 minus 7109.2926/x)
x = 312.4 K = 39.4 °C
model an atom as an electron in a rigid box of length 0.100 nm, roughly twice the bohr radius. what are the four lowest energy levels of the electron?
The least energetic electrons are those in energy level I, also known as energy level K.Higher level electrons have more energy as you move away from the nucleus, and this energy increase is fixed and discrete.
What are the four main levels of energy?Sharp, Principle, Diffuse, and F are the four you need to be aware of (fine or fundamental).So, s, p, d, & f.Only that many sublevels are contained in the Principal Energy Level (the number).
Where is the place with the least energy?A 1s sublevel, which has a single orbital, is always the sublevel with the lowest energy.In its ground state, the hydrogen atom's lone electron will be located in the 1s orbital.As we move on to atoms containing multiple electrons, those additional electrons are added to the subsequent lowest sublevel, such as 2s, 2p, 3s, and so forth.
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rank the following ionic compounds based on increasing lattice energy. mgo, cacl2, nacl, nabr
The highest lattice energy among the given compounds is for MgO. The increasing order of lattice energy for these compounds is NaBr <NaCl< CaCl₂ < MgO.
What is lattice energy?Lattice energy of a compound is the energy required to convert one mole of the compound into its constituent ions in gaseous states. Lattice energy increases with decrease in size and increase in charge.
Thus, compound containing smaller ions with higher charges are having greater lattice energy. Both Mg and oxygen are smaller in size and have charges of +2 and -2 respectively. Na and Ca are bigger than Mg.
Ca2+ is smaller and greater in charge than Na+. Among NaCl and NaBr, Cl is smaller compared to Br thus NaCl has higher lattice energy.
Therefore, the increasing order of lattice energy is NaBr <NaCl< CaCl₂ < MgO.
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Assertion (A): Slaking of lime is an exothermic and combination reaction. Reason (R): Quick lime reacts with water to produce slaked lime.
Assertion (A) : Slaking of lime is an exothermic and combination reaction. Reason (R ) : Quick lime reacts with water to produce slaked lime. Thus the correct answer is option A Both (A) and (R) are true and (R) is correct explanation of the assertion.
Why is the Assertion correct?Slaking of lime, which is the process of adding water to quicklime to produce slaked lime, is an exothermic and combination reaction.
Quicklime, also known as calcium oxide, is a highly reactive substance that reacts with water to produce slaked lime, which is calcium hydroxide.
Therefore, The reaction is exothermic because it releases heat, and it is a combination reaction because it involves the combination of two substances to form a new compound. The reason given in (R) correctly explains the assertion in (A).
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See full question below
Assertion (A) : Slaking of lime is an exothermic and combination reaction.
Reason (R ) : Quick lime reacts with water to produce slaked lime.
A
Both (A) and (R) are true and (R) is correct explanation of the assertion.
B
Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
judy tests a common household substance and finds that it has a ph of 7. what type of substance is in the scenario?
On the pH scale, the pH range for an acid is 0–7 and the pH range for a base is 7–14. pH 7 refers to a neutral solution. pH-7 pure water is a substance considered neutral.
Is hydrogen an ion of H+?This substance, which consists of a water molecule with a proton (H+) added, is an ion because it has a charge. It is known as the hydronium ion and has the formula H3O+. When an acid dissolves in water, the hydronium ion is always produced. Always interacting with the nearby water molecule to generate H3O+, the acid's H+.
What are the uses of H3O+?For the detection of trace gases in the air, chemical ionization using proton-transfer reactions with hydronium ions (H3O+) is frequently used.
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gel electrophoresis separates molecules according to all of the following except question 1 options: a) color b) charge c) size d) shape\
Gel -electrophoresis is used to separate mixture of proteins, and other organic compounds based on their charge, size or shape but not by color.
What is gel electrophoresis?Gel electrophoresis is used to separate combinations of DNA, RNA, or proteins based on their molecular sizes. In gel electrophoresis, the molecules that need to be separated are forced through a gel that has tiny pores by an electrical field.
The speed at which the molecules move through the pores in the gel is inversely proportional to their size. This indicates that a smaller molecule will move through the gel further than a larger the molecule.
However, gel electrophoresis does not involve a separation based on the color of the compounds. Thus, option a is correct.
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Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?.
a. Decrease water reabsorption : decrease blood pressure.
b. Decrease peripheral resistance : decrease blood pressure
c. Vasodilation : decrease blood pressure
d. Decrease salt intake : decrease blood pressure
e. Decrease blood volume : decrease blood pressure
f. Vasoconstriction : increase blood pressure
g. Increase peripheral resistance: increase blood pressure
h. Increase salt intake: increase blood pressure
i. Increase blood volume : increase blood pressure
j. Increase water reabsorption: increase blood pressure
Total peripheral resistance: This phrase describes the obstruction to blood flow that the vascular system presents. The contact between the blood and the vessel's walls causes this resistance. It is, in other words, the vessels' resistance to blood flow. The sum of all the gruesome circuit resistances in the body is the total peripheral resistance. Total peripheral resistance rises as a result of mechanisms that cause vasoconstriction, while total peripheral resistance falls as a result of mechanisms that cause vasodilation.
Blood pressure:
This phrase describes the force that the blood exerts when it flows against the vessel walls. The volume and strength of the blasted blood as well as the vessel's size and suppleness all affect this pressure. Continuous blood pressure variations are caused by factors such as activity, temperature, nutrition, and emotional state.
Complete question:
Very small changes in the solute concentrations in the various fluid compartments cause water to move from one compartment to another, which alters blood composition and blood pressure. How do the following physiological changes affect blood pressure?
a. Decrease water reabsorption
b. Decrease peripheral resistance
c. Vasodilation
d. Decrease salt intake
e. Decrease blood volume
f. Vasoconstriction
g. Increase peripheral resistance
h. Increase salt intake
i. Increase blood volume
j. Increase water reabsorption
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a compound composed of 3.3% h, 19.3% c, and 77.4% o has a molar mass of approximately 60 g/mol. what is the molecular formula of the compound?
The molecular formula of the compound would be [tex]H_2CO_3[/tex].
Molecular formulaThe molecular formula of compounds is related to their empirical formula, such that:
[Empirical formula]n = Molecular formula
Where n is the ratio of the molar mass of the molecular formula and the molar mass of the empirical formula.
Now, let's find the empirical formula of the compound:
H = 3.3 C = 19.3 O = 77.4
The moles equivalent of each atom can be calculated by dividing by their molar weights.
H = 3.3/1 = 3.3 mol
C = 19.3/12 = 1.6 mol
O = 77.4/16 = 4.8
Dividing through by the smallest mole:
H = 3.3/1.6 = 2.1
C = 1.6/1.6 = 1.0
O = 4.8/1.6 = 3.0
Thus, the empirical formula of the compound is [tex]H_2CO_3[/tex].
Molar mass of the empirical formula = 2+12+48 = 62 g/mol
Molar mass of the molecular formula = 60 g/mol
n = 62/60 = 1.
In other words, the molecular formula of the compound is the same as the empirical formula, [tex]H_2CO_3[/tex].
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a 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 300.0 ml hbr.
Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
What is a Titration?Titration is a popular laboratory technique for quantitative chemical analysis to calculate the concentration of an identified analyte (also known as titrimetry and volumetric analysis) (a substance to be analyzed). A standard solution with a known concentration and volume is created as the reagent, also known as the titrant or titrator. To ascertain the concentration of the analyte, the titrant reacts with a solution of the analyte (also known as the titrant). The titration volume is the amount of titrant that interacted with the analyte.
Now;
Conc of Ca, pH of the solution before the addition of any HBr. :
pOH = -log(OH)
[OH-] = 2*[Ca(OH)2] = 2*(0.1) = 0.2 M
pOH = -log(0.2) = 0.698
pH = 14-0.698
pH = 13.3
pH of the solution after the addition of 300.0 mL HBr:
mmol of OH- = 2*MV = 2*100*0.1 = 20 mmol of OH-
mmol of H+ = MV = 0.1*V = 0.1*300= 30 mmol of HBr
left ion = 30-20 = 10 mmol of OH-
V = 100+300 = 400 mL
[H+] = 10/400 = 0.025 M
pH= -log(0.025 ) = 1.6
Formula to determine Ph after Titration: pOH = -log(OH).
The pH of the solution after the addition of 300.0 ml of HBr is 1.6.
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how to claculate (b) what fraction of the chemical energy transformed appears as internal energy in the batteries?
a.) The resistance of the bulb is calculated l to be 4.58 Ohm and b.) The fraction of the chemical energy transformed which appears as internal energy in batteries is 8.4%.
What is electromotive force?Energy transfer to an electric circuit per unit of electric charge measured in volts is called electromotive force .
Given, Voltage= 1.5 Volts
Internal resistance A is 0.240 Ohms
Internal resistance B is 0.180 Ohms
and current = 600 mA = 0.6 Amps
a. To find resistance of the bulb:
The total electromotive force (E) of the electric circuit:
E = 2*1.5
= 3.0 Volts
Total internal resistance = 0.240 + 0.180 = 0.42 ohms
Electromotive force (E) is given by the formula:
E= V+ I r
E is electromotive force
V is voltage and I is the current.
r is internal resistance.
Ohm's law is given by:
V= I R
Given, Resistance, R = 4.58 Ohms
E = IR + I r
R= E/I - r
= (3/0.6) - 0.42
= 4.58 ohms
b. To determine what fraction of chemical energy transformed appears as internal energy in batteries:
the electromotive force (E) in the batteries. E b = I R
= 0.6 * 0.42
= 0.252 Volt
Percent= (Eb / E) * 10
=0.252/3
percent = 8.4 %
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Note: The question given on the portal is incomplete. Here is the complete question.
Question : Two 1.50-V batteries—with their positive terminals in the same direction—are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.240 Ω, the other an internal resistance of 0.180 Ω. When the switch is closed, a current of 600 mA occurs in the lamp. (a) What is the bulb's resistance? Ω (b) What fraction of the chemical energy transformed appears as internal energy in the batteries? %
Which substance has the stronger IMF's?
NaCl or CCL
Answer: NaCL
Explanation:
Because NaCl has a stronger IMFs because NaCl is closer to the highest IMF which is water and NaCl is in water.
How many protons, neutrons, and electrons does Iron (Fe) have if it has a +4 charge?
The number of protons, neutrons, and electrons that iron (Fe) have if it has a +4 charge are 26, 29 and 22 respectively.
How to calculate proton, electron and neutron numbers?Atomic number of an element is the number of protons in the atom of that element. The number of protons of a neutral atom i.e. charge 0 is equal to the number of electrons.
Iron is a metallic chemical element having atomic number 26 and symbol Fe. Since the atomic number is 26, the number of protons is 26.
If the charge of the iron is +4, this means that the number of protons will be 26 while the number of electrons will be 22. The number of protons will be 55 - 26 = 29.
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If you are given two moles of a substance, which of the following would be correct?
You have the same number of particles as in 12 grams of carbon-12.
You have one-third the number of particles that are in 12 grams of carbon-12.
You have two times the number of particles that are in 12 grams of carbon-12.
You have one half the number of particles that are in 12 grams of carbong-12.
Answer:
C. You have two times the number of particles that are in 12 grams of carbon-12.
Explanation:
Avogadro's number, 6.022 ×10^23, equals the number of particles in 12 grams of carbon-12.
This mean 1 mole of a substance will equals to the number of particles that are in 12 grams of carbon-12.
Therefore, 2 moles of a substance will equals to two times the number of particles that are in 12 grams of carbon-12.
the empirical formula of a compound is ch2. its molecular mass is 70 g/mol. the molecular formula of the compound is
The molecular mass is indicated as being 70 g/mol. The molecule's chemical formula is C5H10
How can I determine the molecular mass?Use the mass listed in the Table Of the elements or Atomic Weight Tables to get the atomic mass for every element. To calculate the molecular mass, multiply the subscript (count of atoms) by the atomic mass of the relevant element then add the weights of all the other elements in the molecule.
How many moles is a gramme?The molarity of an element's atoms is determined by multiplying its standard comparative atomic mass by the molar constant, 1 103 grammes = 1 g/mol.
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