C/E & Counting Atoms

C/E 1

100

Which of the following is an element?

• A. H₂O
• B. Au
• C. CO₂

B. Au

200

Which of the following is a compound?

• A. O₂
• B. NaCl
• C. Fe

B. NaCl

300

Which formula represents an element?

• A. NH₃
• B. H₂O
• C. He

• C. He

400

Which substance is made of two or more different elements chemically combined?

• A. Oxygen (O₂)
• B. Gold (Au)
• C. Carbon dioxide (CO₂)

C. Carbon dioxide (CO₂)

500

Which is an element?

• A. Cu
• B. CaCO₃
• C. CH₄

A. Cu

600

Which of the following is a compound?

• A. Ne
• B. C₆H₁₂O₆
• C. Zn

B. C₆H₁₂O₆

700

Which substance contains only one type of atom?

• A. HCl
• B. Ag
• C. NaOH

B. Ag

800

Which is a compound?

• A. N₂
• B. S
• C. H₂SO₄

C. H₂SO₄

900

Which of these is an element?

• A. Mg
• B. CO
• C. NaCl

A. Mg

1000

1. Which formula is a compound?

• A. Ar
• B. H₂O₂
• C. Cl₂

B. H₂O₂

C/E 2

100

11. Which is an element?

• A. C₂H₆
• B. CaCl₂
• C. Al

• C. Al

200

12. Which substance is a compound?

• A. NaHCO₃
• B. Kr
• C. Fe

A. NaHCO₃

300

13. Which of these is an element?

• A. NH₄Cl
• B. Pb
• C. H₂CO₃

B. Pb

400

14. Which is a compound?

• A. O
• B. Br₂
• C. MgO

C. MgO

500

15. Which formula represents an element?

• A. Si
• B. H₂CO₃
• C. KNO₃

A. Si

600

16. Which of the following is a compound?

• A. Ca
• B. CO
• C. Xe

B. CO

700

17. Which is an element?

• A. Na₂SO₄
• B. Ni
• C. NH₃

B. Ni

800

18. Which substance is a compound?

• A. I₂
• B. Pt
• C. CaCO₃

• B. Pt

900

19. Which formula represents an element?

• A. Hg
• B. CH₃OH
• C. NaOH

A. Hg

1000

20. Which is a compound?

• A. He
• B. H₂O
• C. Cu

B. H₂O

Count A1

100

How many total atoms are in H₂O?

• A. 2
• B. 3
• C. 4

B. 3

200

How many total atoms are in CO₂?

• A. 3
• B. 2
• C. 4

A. 3

300

How many total atoms are in NH₃?

• A. 3
• B. 3
• C. 4

C. 4

400

How many total atoms are in CH₄?

• A. 5
• B. 4
• C. 6

A. 5

500

How many total atoms are in NaCl?

• A. 1
• B. 2
• C. 3

B. 2

600

How many total atoms are in CaO?

• A. 1
• B. 2
• C. 4

B. 2

700

How many total atoms are in H₂O₂?

• A. 4
• B. 2
• C. 6

A. 4

800

How many total atoms are in N₂O?

• A. 2
• B. 3
• C. 4

B. 3

900

How many total atoms are in SO₃?

• A. 3
• B. 4
• C. 5

B. 4

1000

1. How many total atoms are in C₂H₆?

• A. 8
• B. 6
• C. 7

A. 8

Count A2

100

11. How many total atoms are in Na₂O?

• A. 2
• B. 2
• C. 3

C. 3

200

12. How many total atoms are in MgCl₂?

• A. 3
• B. 2
• C. 4

A. 3

300

13. How many total atoms are in Al₂O₃?

• A. 4
• B. 5
• C. 6

B. 5

400

14. How many total atoms are in PCl₅?

• A. 5
• B. 4
• C. 6

C. 6

500

15. How many total atoms are in H₂SO₄?

• A. 7
• B. 6
• C. 8

A. 7

600

21. How many total atoms are in Ca(OH)₂?

• A. 4
• B. 5
• C. 6

B. 5

700

22. How many total atoms are in Al₂(SO₄)₃?

• A. 15
• B. 16
• C. 17

C. 17

800

23. How many total atoms are in Mg(NO₃)₂?

• A. 9
• B. 8
• C. 10

A. 9

900

24. How many total atoms are in Ca₃(PO₄)₂?

• A. 11
• B. 13
• C. 15

B. 13

1000

20. How many total atoms are in 3CO₂?

• A. 9
• B. 6
• C. 12

A. 9