Which of the following best describes the role of coefficients in a chemical equation?

They show the number of molecules or formula units.

They show the number of atoms in a molecule.

They show the type of chemical bond.

They show the charge of the ion.

A student writes the equation $$\mathrm{CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O}$$ . Is this equation balanced? Explain your reasoning.

Yes, because the number of each type of atom is the same on both sides.

No, because there are more oxygen atoms on the product side.

No, because there are more hydrogen atoms on the reactant side.

No, because there are more carbon atoms on the product side.

A student claims that $$\mathrm{2H_2 + O_2 \rightarrow 2H_2O}$$ is not balanced because there are more hydrogen atoms than oxygen atoms. Is this reasoning correct? Why or why not?

No, because the number of atoms must be equal for each element separately, not compared between elements.

Yes, because the number of atoms must be equal for each element.

Yes, because hydrogen and oxygen must be equal.

No, because the equation is not balanced at all.

Understanding Chemical Equations Quiz

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-PS1-5, MS-PS1-1, HS-PS1-7

+1

Standards-aligned

Ricardo Oyanedel Olivares

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is the correct chemical formula for water?

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1

2

0

4

Tags

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Number of oxygen atoms in the molecule

Number of molecules

Number of electrons

Number of protons

Tags

NGSS.MS-PS1-1

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Yes

No

Tags

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which equation is balanced?

Tags

NGSS.MS-PS1-5

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Understanding Chemical Equations Quiz

20 questions

Which of the following is the correct chemical formula for water?

Which equation is balanced?

Which of the following equations is unbalanced?

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