Finding Percents

Finding Percents

10th Grade

15 Qs

quiz-placeholder

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Percent Composition by Mass

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Finding Percents

Finding Percents

Assessment

Quiz

Science

10th Grade

Hard

NGSS
MS-PS1-1, HS-PS1-7

Standards-aligned

Created by

Lisa Thompson

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of sodium in NaCl?

39%

61%

35%

65%

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of oxygen in water (H2O)?

33%

66%

89%

11%

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a solution of saltwater, if the mass of salt is 20g and the mass of water is 80g, what is the percent concentration of salt?

20%

25%

30%

40%

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of carbon in carbon dioxide (CO2)?

27%

33%

44%

12%

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If a metal alloy contains 70g of copper and 30g of zinc, what is the percent composition of zinc in the alloy?

30%

40%

50%

60%

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the percent by mass of hydrogen in methane (CH4)?

25%

50%

75%

12.5%

Tags

NGSS.MS-PS1-1

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