# Steps Of Balancing Equations Quiz

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
| By Ana Selby
A
Ana Selby
Community Contributor
Quizzes Created: 4 | Total Attempts: 47,941
Questions: 9 | Attempts: 1,776

Settings

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!

• 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

C. Atoms are rearranged
Explanation
Remember the Law of Conservation of matter: Matter cannot be created nor destroyed, although it may be rearranged.

Rate this question:

• 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

C. A reactant
Explanation
A reactant (left to the --->)is the substance that undergoes changes.

Rate this question:

• 3.

### A chemical equation is balanced by changing or adding

• A.

Chemical symbols

• B.

Subscripts

• C.

Coefficients

• D.

Reactants

C. Coefficients
Explanation
The coefficients (number in front of atoms or molecules)are the only item that can be changed when balancing chemical equations.

Rate this question:

• 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.

A. The reaction to occur
Explanation
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:

• 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

D. 10
Explanation
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:

• 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

C. 2,1,2
Explanation
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 2,1,2

Rate this question:

• 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

B. 1,1,1,1
Explanation
Are you loving it?

Rate this question:

• 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

B. 4,3,2
Explanation
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:

• 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

B. 2,1,2
Explanation
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:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 01, 2008
Quiz Created by
Ana Selby

Related Topics