Answer:
The law of Universal Gravitation.
An organic compound contains 24.24%carbon,4.04% hydrogen,and 71.72%chlorine what is its empirical formula if the molecular mass of the coumpound is 148.5 determine its molecular formula
The empirical formula of an organic compound with 24.24% carbon. 4.04% hydrogen, and 71.71% chlorine will be [tex]CHCl_2[/tex].
If the molar mass of the compound is 148.5, the molecular formula will be [tex]C_2H_2Cl_4[/tex].
Empirical and Molecular FormulasThe compound contains:
C = 24.24H = 4.04Cl = 71.71The mole of each atom can be found by dividing them by their respective molecular weights.
C = 24.24/12 = 2.02H = 4.04/1 = 4.04Cl = 71.71/35.5 = 2.02Now, let's divide through by the smallest number of moles
C = 1H= 2Cl = 1Thus, the empirical formula of the compound is [tex]CHCl_2[/tex].
The molar mass of the empirical formula is calculated as:
12 + 1 + (35.5 x2) = 84 g/mol
Molecular formula = [empirical formula]n
Where n = Molecular formula mass/empirical formula mass
In this case, n = 148.5/84
= 1.77 (approximatel 2)
Thus, the molecular formula of the compound is [tex]C_2H_2Cl_4[/tex].
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Please help
Calcium carbonate can undergo a chemical reaction to produc calcium oxide (CaO) and carbon dioxide (CO₂). Which possible masses of calcium oxide and carbon dioxide can form when 400g of calcium carbonate undergoes this chemical reaction?
*
1 point
400g CaO and 0g CO₂
224g CaO and 176g CO₂
40g CaO and 10g CO₂
The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
1 point
1 gram Ne = 20.180 moles = 1.215×1025 atoms
1 gram Ne = 20.180 moles = 6.022×1023 atoms
1 mole Ne = 20.180 grams = 1.215×1025 atoms
1 mole Ne = 20.180 grams = 6.022×1023 atoms
When reactants of a reaction are known, which fact can always be deduced about the products?
*
1 point
the state of the products
the number of atoms in the products
the number of products
the mass of each product
The atomic mass of carbon (C) is 12.01amu and oxygen (O) is 16.00amu. Which molar mass is correct for carbon dioxide (CO₂)?
*
1 point
28.01 g/mol
44.01 g/mol
192.16 g/mol
268.01 g/mol
How many moles is in 43g of CO₂?
*
1 point
1204 mol
1.54 mol
2.59 x 10²⁵
According to the law of conservation of matter, which statement best describes a balanced chemical equation?
1 point
The number of moles of atoms of each element must be the same in the reactants and in the products.
The total number of moles of atoms must be the same in the reactants and in the products.
The total number of molecules must be the same in the reactants and in the products.
The number of moles of each molecule must be the same in the reactants and in the products.
Nitrogen gas combines with hydrogen gas to produce ammonia (N₂+3H₂⟶Ammonia). Based on the law of conservation of mass, which could be the product of the reaction?
*
1 point
NH₂
NH₃
2NH₃
3NH₂
How do you calculate the number of moles from mass?
*
1 point
it is the product of moles and molar mass
it is the quotient of mass and molar mass
it is the product of mass and molar mass
it is the quotient of avogadro's number and molar mass
Sugar reacts with oxygen gas to produce carbon dioxide and water (C₆H₁₂O₆ + 6O₂⟶6CO₂+6H₂O). Which ratio of components is correct?
*
1 point
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed.
For each mole of O₂, 1 mole of C₆H₁₂O₆ is needed.
For every 5 moles of water produced, 6 moles of oxygen is needed.
What is the molar mass of NH₄Cl?
*
1 point
53.5 g/mol
50.5 g/mol
497.0 g/mol
The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is
224g CaO and 176g CO₂; option CThe correct measurement of the element neon (Ne):
1 mole Ne = 20.180 grams = 6.022 × 10²³ atomsWhen reactants of a reaction are known, the fact that can always be deduced about the products is:
the number of products; option CThe correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B
The number of moles in 43 g of CO₂ is 0,977 moles.
According to the law of conservation of matter, the statement that best describes a balanced chemical equation:
The number of moles of atoms of each element must be the same in the reactants and in the products.
Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.
To calculate the number of moles from mass, take the quotient of mass and molar mass; option B
The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A
The molar mass of NH₄Cl is 53.5 g/mol; option A.
What mass of calcium oxide (CaO) and carbon dioxide (CO₂) are produced when 400 g of Calcium carbonate decomposes?The decomposition of 1 mole of calcium carbonate yields 1 mole of CaO and 1 mole of CO₂ as shown in the equation below:
CaCO₃ ---> CaO + CO₂.
Molar mass of CaCO₃ is 100 g.
400 g of CaCO₃ is equal to 4 moles
4 moles of CaCO₃ produces 4 moles of CaO and CO₂
Mass of 4 moles of CaO = 4 * 56 = 224 g
Mass of 4 moles of CO₂ = 4 * 44 176 g
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Name one hobby and/or career in which it would be important for people to understand the gas laws. Explain why it is important to that hobby/career.
One career in which it would be important for people to understand the gas laws is chemist.
Who is a chemist?A chemist is a person who specializes in the science of chemistry, especially at a professional level.
The gas laws are an integral component of chemistry as a subject or course of study. The fundamental gas laws in chemistry are as follows;
Boyle's Law Gay- Lussac Law Avogadro's LawIdeal Gas Law: PV = nRTThese laws explain the interaction of an ideal gas, which is a gas whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container.
Therefore, being a chemist as a career path means understanding the gas laws.
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look at the picture
high school
Answer:
determining the melting point of a substance
Explanation:
The following chemical reaction takes place in aqueous solution:
FeCl₂(aq)+K₂S(aq) → FeS(s)+2 KCl(aq)
Write the net ionic equation for this reaction.
Answer: Fe(aq) + S(aq) yields FeS(s)
Explanation:
Fe+2 + 2Cl- + 2K+ + S-2 yields FeS(S) + 2K+ + 2Cl-
Cross out the aqueous ions and you are left with
Fe+2 + S-2 yields FeS(s).
Write a balanced chemical equation for each of the following neutralization reactions.
HNO3 + Al(OH)3
The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.
What is the balanced chemical equation neutralization reaction?A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.
A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.
The balanced chemical equation for the given value of the neutralization reaction is given below.
Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.
So we can conclude that Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.
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French toast (the breakfast food) would be
an example of a/an
compound
molecule
pure substance
mixture
French toast (the breakfast food) would be an example of molecule because of chemical change.
What are molecules ?A molecule is the smallest unit of a material that keeps its content and properties. It is composed of two or more atoms that are joined together by chemical bonds. Chemistry is built upon molecules. The element symbol and a subscript indicating the number many atoms are used to identify molecules.
How are molecules created?Atoms interact with each other and with their nuclei when they are close to one another. A molecule is created whenever two or more atoms combine in a way that lowers the state's overall energy.
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In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a
reaction. The opposite process is a
reaction.
In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction
fireworks are a class of low explosive devices used for aesthetic and entertainment purposes
Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction
2KNO₃ → 2KNO₂ + O₂
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Is distilled water act as preservative?
why is oxygen used in the production of raw copper?
Oxygen is used in the production of raw copper because it is a catalyst for the reaction that turns alumina into pure copper.
Alumina is an ore, and it is a refractory metal. Alumina has three components: aluminum oxide (Al2O3), silica (SiO2), and water. When this ore is heated, the aluminum oxide breaks down into smaller pieces of aluminum and oxygen gas.
When this process happens, these gases react with each other to produce pure oxygen gas. The reaction between the gases also produces heat, which causes more alumina to break down from its original form.
The oxygen produced by this reaction can be used as a catalyst for turning alumina into pure copper at high temperatures.
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If You Had Three Wishes, What Would You Wish For
Assuming you can't wish for infinite wishes:
1. Hyperintelligence
2. Elite athleticism (within the confines of human limitations of course. So just being a 99th percentile athlete)
3. The ability to summon a delicious steak of any variety at any level of doneness at any moments notice
What is the relationship among force, mass, and acceleration? (1 point)
O Force equals mass divided by acceleration.
O Force equals mass times acceleration.
O Force equals mass minus acceleration.
O Force equals mass plus acceleration.
The relationship among force, mass, and acceleration is force equals mass times acceleration. Therefore, option B is correct.
What is an acceleration ?The term acceleration is defined as the rate of change of velocity. When an object moves in a circular path at a constant speed, it is still accelerating because its velocity direction changes.
The application of a net force to an object alters its motion, the greater the net force, the greater the acceleration. More massive objects necessitate greater net forces to accelerate at the same rate as less massive objects.
“Force equals mass times acceleration.” This is because this shows the equation for force, and thus it shows the relationship between them in how they are used.
Thus, option B is correct.
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I need help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
There was distilled water in the cuvette when the student put the standard solution in it.
The correct option is A.
What is the use of concentration of solution?The concentration of a solution can be used to determine how much solute has been dissolved in a given quantity of liquid or solution. A concentrated solution is one that has a large concentration of the dissolved solute. If there is only a small amount of dissolved solute in the solution, it is said to be dilute.
Why is it important to understand the concentration of the solutions ?In chemistry, a solution's concentration refers to the proportion of a solute that is present in a given amount of solvent or solution. Understanding the solute concentration is necessary for controlling the stoichiometry of reactants in solution reactions.
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The complete question is -
A student uses visible spectrophotometry to determine the concentration of CoCl₂ (aq) in a sample solution. First the student prepares a set of CoCl₂ ( aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The student made the standard curve above. Which of the following most likely caused the error in the point the student plotted at 0.050 M Co²⁺(aq)?
A-There was distilled water in the cuvette when the student put the standard solution in it.
B-There were a few drops of the 0.100 M Co²⁺(aq) standard solution in the cuvette when the student put the 0.050 M standard solution in it.
C-The student used a cuvette with a longer path length than the cuvette used for the other standard solutions.
D-The student did not run a blank between the 0.050 M Co²⁺(aq) solution and the one before it.
An atom of Lithium has three protons. It is neutral so it has no electrical charge.
Which statement is true using ONLY this information?
A There is a charge of +3 on an atom of lithium.
B There are three neutrons in the nucleus.
C There are three electrons
D There is charge -3 on an atom of lithium.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. The correct option is option C
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.
As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The proton number is 3 that means number of electron is also 3 because proton number is equal to number of electron and this equals to atomic number.
Therefore there are three electrons in Lithium if it has three proton. The correct option is option C
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At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g)+2B(g)↽−−⇀4C(g)c=1.33×1031 3 A ( g ) + 2 B ( g ) ↽ − − ⇀ 4 C ( g ) K c = 1.33 × 10 31 If, at this temperature, 1.80 mol of A and 3.50 mol of B are placed in a 1.00 L container, what are the concentrations of A, B, and C at equilibrium?
The equilibrium concentrations of A, B, and C at equilibrium are:
the concentration of A = 0.12 Mthe concentration of B = 2.38 Mthe concentration of C = 2.24 MWhat are the equilibrium concentrations of A, B, and C?The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:
Kc = [C]⁴ / [A]³ * [B]² -----(1)
Kc = 1.33 * 10
The initial concentrations of A and B are as follows:
A = 1.80 mol / 1 L = 1.8 M
B = 3.50 mol / 1 L = 3.50 M
The concentrations at equilibrium are given by the ICE table below:
3 A (g) + 2 B (g) ⇄ 4 C (g)
I 1.80 3.50 0
C - 3x - 2x + 4x
E 1.80 - 3x 3.50 - 2x 4x
Substituting the concentrations at equilibrium into the equilibrium equation above
1.33 * 10³¹ = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²
x = 0.56
Therefore;
the concentration of A = 1.80 - 3 * 0.56
the concentration of A = 0.12 M
the concentration of B = 3.50 - 2 * 0.56
the concentration of B = 2.38 M
the concentration of C = 4 × 0.56
the concentration of C = 2.24 M
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Help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Answer:
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Explanation:
Not really sure what the problem is, the answer is given in the question.
The question asks "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
The first part of the question is "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
The second part of the question is literally the answer, "Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
it could be that you just accidentally pasted the same thing twice, and the original question was just "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
In that case, remember that the order of greenhouse gas potency is Carbon dioxide, methane, nitrous oxides, chlorofluorocarbons. Thus, nitrous oxide and methane are both more potent than carbon dioxide.
When 0.442g of sodium metal is added to an excess of HCl acid, 4590J of heat are produced. What is the enthalpy of the reaction as written:
2Na(s) + 2HCl (aq) yields 2NaCl + H2(g)
What is enthalpy of reaction in KJ.
I tried to work this out but am not sure if I need to multiply my answer by two because of the 2 moles of Na or if that is accounted for already in the grams of sample.
My work as far:
chemical reaction is exothermic, so delta H wil be negative
Q=number of moles x delta H
There are 2 moles of Na in equation producing 2 mol NaCl
Na is 22.989769 g/mol so 0.4429 sample has .4429/22.989769 = 0.019 mol
Delta H is Q/number of moles
-4590J/.019mol = -241,578.9J divided by 1000 is -241.579KJ. (enthalpy)
So I wonder if I need to multiply this by 2 since the chemical equation has two moles
if so, the answer would be -483.158KJ.
IF I'm not using the correct formula to solve, I also need to know that.
The enthalpy of the reaction is obtained as 242 kJ/mol
What is the enthalpy?We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.
We have been supplied with the amount of that is produced in the process. Hence we have;
Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles
Thus, we have the enthalpy as;
H = 4590 * 10^-3 kJ/0.019 moles
= 242 kJ/mol
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0.5 pts This is a reaction that you can find the two half reactions for on a REDOX tower in your discussion manual: NAD+ +H2 --> NADH + 2H+
Group of answer choices
Which compound is the electron donor?
Which compound is the electron acceptor?
When the electron donor loses the electron it becomes:
When the electron acceptor accepts the electron it becomes:
Overall the electron travels from:
The electron donor is [tex]H_2[/tex].
The electron acceptor is [tex]NAD^+[/tex]
When the electron donor loses the electron, it becomes oxidized.
When the electron acceptor accepts the electron, it becomes reduced.
Overall, the electron travels from H to [tex]NAD^+[/tex].
Oxidation and reductionOxidation is defined as:
Loss of electronsIncrease in oxidation numberLoss of hydrogenGain of oxygenReduction is defined as:
Gain of electronsDecrease in oxidation numberGain of hydrogenLoss of oxygenLooking at the reaction, [tex]NAD^+[/tex] gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is [tex]H_2[/tex] .
Thus, the electron acceptor is [tex]NAD^+[/tex]. When the electron donor, [tex]H_2[/tex], loses the electron, it becomes oxidized to [tex]H^+[/tex].
When the electron acceptor, [tex]NAD^+[/tex], accepts the electron, it becomes NADH.
This means that electron travels from [tex]H_2[/tex] to [tex]NAD^+[/tex]
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A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine =4.6*10^-4f
The concentration of the methylamine chloride is 0.0000013 M.
What is the concentration of methylamine chloride in the solution?We know that the concentration has to do with the amount of the substance that is present. Hence, the question is essentially trying to ask us to be able to find the the concentration of methylamine chloride in the solution.
[H^+] = Antilog(-0.20) = 0.63 M
Ka = 1 * 10^-14/4.6*10^-4 = 2.22 * 10^-11
Let us first set up the ICE table as shown below;
CH3NH2(aq) + H^+ ⇄ CH3NH3^+(aq) + OH^-(aq)
I 0.15 0.63 0 0
C -x -x +x +x
E 0.15 - x 0.63 -x x x
Ka = [CH3NH3^+] [OH^-]/[CH3NH2] [H^+]
2.22 * 10^-11= x^2/[0.15 - x] [0.63 -x ]
2.22 * 10^-11(0.09 -0.15x - 0.63x + x^2) = x^2
2.22 * 10^-11(0.09 - 0.48x +x^2) = x^2
1.9 * 10^-12 - 1.1 * 10^-11x + 2.22 * 10^-11x^2 = x^2
x^2 - 2.22 * 10^-11x^2 + 1.1 * 10^-11x - 1.9 * 10^-12 = 0
x^2 + 1.1 * 10^-11x - 1.9 * 10^-12 = 0
x =0.0000013 M
Concentration of the methylamine chloride = 0.0000013 M
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What is the molality of an aqueous solution made with 5.00 kg of water and 3.6 mol of solute?
0.72 m NaOH
3.6 m NaOH
0.090 m NaOH
1.4 m NaOH
The molarity of the aqueous solution is determined as 0.72 M NaOH.
What is molarity?
Molarity is used to express the concentration of a solution. It is described as the number of moles of a solute in a given concentration of a solution.
Mathematically, molarity is given as;
M = n/V
where;
n is the number of moles of the soluteM is the concentration of the solutionV is the volume of the solutionThe volume of the water is calculated as follows;
volume = mass / density
volume = (5 kg) / (1000 kg/m³)
volume = 0.005 m³
The volume of the water in liters is calculated as follows;
volume = 0.005 m³ = 5 liters
The given parameters;
number of moles of the solute = 3.6 moles
Molarity = 3.6 moles / 5 L
molarity = 0.72 M
Thus, the molarity of the aqueous solution of sodium hydroxide is determined from the ratio of number of moles to the volume of the solution.
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hello, can someone please help me with this problem
This reaction is exothermic reaction and amount of heat that was released or absorbed by the reaction is 208.8kJ and reaction enthalpy means ΔH is 705.91kJ/mol
An exothermic process releases heat causing the temperature of the immediate surroundings to rise
Here given reaction is
KOH → K⁺ + OH⁻
So, here given data is 14.4 gram of potassium hydroxide in 250 gram of water and the temperature of water rise from 20°C to 34.5°C and
We have to find which type of reaction is this =? and
Calculate heat released or absorbed by this reaction =? and
Calculate reaction of enthalpy ΔH = ?
So this reaction is exothermic because when potassium react with water it gives potassium hydroxide and in that potassium hydroxide the potassium is positive charge and OH has negative charge
Amount of heat released or absorbed by the reaction the formula are
q = m×c×ΔT and ΔT = 20°C - 34.5°C = 14.5°C and c = 0.452J/g°C
q = 14.4 gram×0.452×14.5°C
q = 94.377kJ
Reaction enthalpy means ΔH so,
ΔHreaction = m×s×ΔT
ΔHreaction = 14.4 gram×94.377kJ×14.5°C
ΔHreaction = 705.91kJ/mol
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Water is exposed to electromagnetic radiation of wavelength 3.80 x 10-8 m. Assume that all the radiation is absorbed and converted to heat. How many photons are required to raise the temperature of 4.48 g of water by 4.65 K?
The number of photons is obtained from the calculation as 1.68 * 10^19 photons.
What is energy?
By definition, we know that energy is the ability to do work. Now we know that we have the wavelength of the radiation can be seen from the question and the values that are given to be 3.80 x 10-8 m.
Then energy = hc/λ
h = Plank's constant
c = speed of light
λ = wavelength
E = 6.6 * 10^-34 * 3 * 10^8/ 3.80 x 10^-8
E = 5.2 * 10^-18 J
Energy of the water = mcdT
= 4.48 * 4.2 * 4.65 = 87.5 J
Number of photons required = 87.5 J/5.2 * 10^-18 J
= 1.68 * 10^19 photons
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Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O.
The empirical formula of the caffeic acid is C₂H₂O.
What is mass composition of each element?The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;
mass of carbon dioxide CO₂ = 44 g/molmass of water H₂O = 18 g/molatomic mass of carbon = 12 g/molatomic mass of hydrogen gas = 2 g/moltotal mass of the caffeic acid = 1 x 10² mg = 0.1 gmass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g
mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g
mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g
The molar composition of the elements is calculated as follows;
H = 0.0045 /1 = 0.0045
C = 0.06 / 12 = 0.005
O = 0.0355 / 16 = 0.0022
Divide through with the smallest molar composition
H = 0.0045 / 0.0022 = 2
C = 0.005/0.0022 = 2
O = 0.0022/0.0022 = 1
The empirical formula is C₂H₂O
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The complete question is below:
Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.
HELP NEEDED ASAP!!!! Which of the following statements about the filament sliding model is FALSE?
A. Actin subunits form the dark A band.
B. The thick filament has an head with an ATP-binding site.
C. The tick filament, or the M-line pulls the thin filament to contract a muscle
D. Actin and myosin are both motor proteins.
Considering the given statements about the filament sliding model in muscles, the statement that is false is;
Actin subunits form the dark A band; option AWhat are muscle filaments?Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.
There are three main proteins filaments that make up the myofibrils, and they are:
myosin - this is a contractile protein that makes up the dark A band in muscle fibersactin - this a contractile protein that makes up the light band in muscle fibertitin- this is an elastic proteinLearn more about muscle filaments at: https://brainly.com/question/1370027
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look at the picture
Each isotopes has a different atomic mass , and each occurs in nature in different abundance this statement is true.
What are Isotopes?Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons) due to the difference in the total number of neutrons in their nuclei. The total number of neutrons in the nucleus of an isotope can be determined by subtracting the atomic number of the element from the mass number of the isotope.
For example, the mass number of the isotope 12C of carbon is 12. The atomic number of carbon is 6. Therefore, the isotope carbon-12 has a total number of neutrons of 6.
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situation
A strip of solid lead metal
is put into a beaker of
0.045M Sn(NO3)2 solution.
A strip of solid tin metal is
put into a beaker of
0.092M Pb(NO3)2 solution.
che
rea
From the reactivity order, we can see that Tin is more reactive than lead. Hence Tin can replace lead from its salt through the strip of solid lead metal.
What is the reactivity series?A chart listing metals in decreasing order of reactivity is called the metals reactivity series.
A metal generally reacts with other chemicals more forcefully the more reactive it is. The easier it is for positive ions to form when losing electrons (cations).
An empirical, calculated, and structurally analytical progression of a group of metals, grouped in order of their "reactivity" from highest to lowest, is known as a "reactivity series" in chemistry.
The equations can be stated as
Pb(s) + Sn[tex](NO_{3})_2[/tex] (aq) → no reaction
Sn (s) + Pb [tex](NO_{3})_2[/tex] → reaction occurs
The final reaction can be stated as
Sn (s) + Pb [tex](NO_{3})_2[/tex] (aq) → Sn[tex](NO_{3})_2[/tex] (aq) + Pb(s)
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Complete Question
A strip of solid lead metal is put into a beaker of 0.045M Sn(NO3)2 solution.
A strip of solid tin metal is put into a beaker of 0.092M Pb(NO3)2 solution.
Provide the complete chemical reaction for the two statements.
emmissions generated by a coal powered utility
Answer:
Explanation:
Coal is a cheap and abundant resource, and carbon dioxide (CO2) from coal use is responsible for about 40 percent of global greenhouse gas (GHG) emissions from fossil fuel use.
5. How many moles are in a gas at 273 K and 1.4 atm in a container with a volume of 30 L?
There are 0.0476 moles in a gas at 273 K and 1.4 atm in a container with a volume of 30 L.
Describe moles.
The mole (symbol: mol) is the unit of substance amount used by the International System of Units (SI). The amount of a material determines how many elementary entities of that substance are present in an object or sample.
A mole contains precisely 6.022 14076 × 1023 elementary entities. Depending on the substance, an elementary entity may be an atom, a molecule, an ion, an ion pair, or a subatomic particle like an electron. Ten moles of water, a chemical compound, and ten moles of mercury, a chemical element, both contain exactly one atom for each molecule of water, despite having differing volumes and masses.
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Asteroids are left over pieces of rocks that didn't become planets or satellites. Where are most of these located in the Solar System?
A. The Oort Cloud
B. The Kuiper Belt
C. The Asteroid Belt
Asteroids are left over pieces of rocks that didn't become planets or satellites. These are mostly located in The Asteroid Belt in the Solar System.
The main asteroid belt is a region between the orbits of Mars and Jupiter. The Asteroid Belt is a torus shaped region. Some of the asteroids may go in the front or behind the Jupiter.
The Oort cloud has around 2.3% of left over pieces of asteroid rocks. It is a predicted percentage.The asteroids were located in more amount earlier when the interplanetary zones were clearing in the solar system.
The Kuiper Belt has bits of rocks, comets, ice, and the dwarf planets. It is similar to the asteroid belt but it is more complex and larger.
Asteroids are discovered by a systematic search for a planet between Mars and Jupiter in the asteroid belt.
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Once started, why can nuclear fission continue to occur on its own? The thermal energy released can cause the products to join. The neutron formed by the reaction can cause more nuclei to combine. The thermal energy released can cause the products to split. A neutron begins the reaction, and more neutrons are formed in it.
Once started, nuclear fission reactions are able to continue to occur on their own because a neutron begins the reaction, and more neutrons are formed in it; option D
What is nuclear fission?Nuclear fission is a type of nuclear reaction in which the nucleus of atoms of large molecular mass is split into two or more smaller atomic nuclei.
Nuclear fission reactions result in the release of large amounts of heat energy and radiation.
Nuclear fission reactions once started, are able to go on occurring on their own until all fissionable material is used up. This is known as a chain reaction.
A chain reaction in nuclear fission occurs because when the atomic nucleus of the large atom is bombarded with fast-moving neutrons, the neutrons that are captured by the nucleus of the large atom results in the fission of the atom and the release of more neutrons that initiate more fission reactions.
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