Steps Of Balancing Equations Quiz
A simple way to learn: practicing! By applying the Law of conservation of mass it is easy to have any chemical equation balanced! A few rules and everything is possible!
Questions and Answers
- 1.
What happens in a chemical reaction?
- A.
Atoms are destroyed
- B.
Atoms are created
- C.
Atoms are rearranged
- D.
Atoms are heated or cooled
Correct Answer
C. Atoms are rearrangedExplanation
Remember the Law of Conservation of matter: Matter cannot be created nor destroyed, although it may be rearranged.Rate this question:
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- 2.
a ssa A substance that undergoes a change in a chemical reaction is
- A.
A product
- B.
A chemical
- C.
A reactant
- D.
An enzyme
Correct Answer
C. A reactantExplanation
A reactant (left to the --->)is the substance that undergoes changes.Rate this question:
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- 3.
A chemical equation is balanced by changing or adding
- A.
Chemical symbols
- B.
Subscripts
- C.
Coefficients
- D.
Reactants
Correct Answer
C. CoefficientsExplanation
The coefficients (number in front of atoms or molecules)are the only item that can be changed when balancing chemical equations.Rate this question:
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- 4.
A balanced chemical equation shows the proportions of reactants and products necessary for
- A.
The reaction to occur
- B.
Mass to be conserved.
- C.
Energy use to be minimized.
- D.
Electrolysis to occur.
Correct Answer
A. The reaction to occurExplanation
When we balance an equation we know how much reactants we need for the reaction to occur. It the same as writing a recipe (one cup of rice needs two cups of water, try it!).Rate this question:
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- 5.
If you start with 5 mol of O2 in the reaction 2Mg + O2 ----> 2MgO, how many moles of Mg will you need?
- A.
4
- B.
5
- C.
8
- D.
10
Correct Answer
D. 10Explanation
Based on the balanced equation, one mol of Oxygen reacts with 2 mol of Magnesium, therefore if I multiply one mol five times I need to multiply the two moles of Mg five times too (2 X 5 = 10)Rate this question:
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- 6.
What coefficients will satisfy the following equation Hg + O2 ----> HgO
- A.
1,1,1
- B.
2,2,1
- C.
2,1,2
- D.
1,2,2
Correct Answer
C. 2,1,2Explanation
In the reactants side, I have 1 mercury atom and 2 Oxygen atoms, so I need to have the same in the products side, a number 2 in front of HgO will give 2 Oxygen, but also gives me 2 Hg, so now I need to add a 2 in front of my Hg in the reactant side to have 2,1,2Rate this question:
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- 7.
What coefficients will satisfy the following equation AgNO3 + NaCl ----> AgCl + NaNO3
- A.
2,2,2,1
- B.
1,1,1,1
- C.
1,2,1,2
- D.
2,1,2,1
Correct Answer
B. 1,1,1,1Explanation
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- 8.
What coefficients will satisfy the following equation Al + O2 --> Al2O3
- A.
1,3,2
- B.
4,3,2
- C.
2,2,2
- D.
2,1,3
Correct Answer
B. 4,3,2Explanation
To balance the equation Al + O2 -> Al2O3, we need to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, we have 1 Al atom on the left side and 2 Al atoms on the right side, so we need to multiply the coefficient of Al by 2. Similarly, we have 2 O atoms on the left side and 3 O atoms on the right side, so we need to multiply the coefficient of O2 by 3. Therefore, the coefficients that satisfy the equation are 4, 3, 2.Rate this question:
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- 9.
What coefficients will satisfy the following equation H2 + O2 ---> H2O
- A.
2,2,1
- B.
2,1,2
- C.
4,1,2
- D.
2,2,2
Correct Answer
B. 2,1,2Explanation
The equation represents the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O). The coefficients in front of each compound indicate the number of molecules involved in the reaction. In this case, the equation is balanced when there are 2 molecules of hydrogen gas, 1 molecule of oxygen gas, and 2 molecules of water. This ensures that the number of atoms on both sides of the equation is equal, satisfying the law of conservation of mass.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 01, 2008Quiz Created by
Ana Selby
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