Finding Percents

Quiz
•
Science
•
10th Grade
•
Hard
Standards-aligned
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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