Counting Atoms -Multiple Choice Questions Quiz

Question 1: How many atoms are there in one molecule of water (H2O)?

(a) 2
(b) 3
(c) 1
(d) 4

Question 2: How many oxygen atoms are there in two molecules of carbon dioxide (CO2)?

(a) 2
(b) 4
(c) 1
(d) 3

Question 3: How many atoms are there in one molecule of methane (CH4)?

(a) 4
(b) 1
(c) 5
(d) 2

Question 4: How many hydrogen atoms are there in three molecules of ammonia (NH3)?

(a) 1
(b) 3
(c) 9
(d) 6

Question 5: How many atoms are there in one molecule of glucose (C6H12O6)?

(a) 6
(b) 12
(c) 24
(d) 18

Question 6: How many nitrogen atoms are there in two molecules of nitrogen gas (N2)?

(a) 1
(b) 2
(c) 4
(d) 6

Question 7: How many atoms are there in one molecule of sulfuric acid (H2SO4)?

(a) 3
(b) 5
(c) 7
(d) 8

Question 8: How many oxygen atoms are there in one molecule of carbon monoxide (CO)?

(a) 2
(b) 1
(c) 3
(d) 0

Question 9: How many atoms are there in one molecule of ethanol (C2H5OH)?

(a) 7
(b) 6
(c) 8
(d) 9

Question 10: How many atoms are there in one molecule of nitrogen dioxide (NO2)?

(a) 2
(b) 3
(c) 4
(d) 5

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Total score: /10

Answer key:

Question 1: a

Question 2: b

Question 3: c

Question 4: d

Question 5: d

Question 6: c

Question 7: d

Question 8: b

Question 9: c

Question 10: c