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20. Which of the following are pure substances? I. Concrete 11. Wood Table salt IV. Milk V. Copper a. I only b. II and IV IV and V d. III and V III, IV, and V e.lll, lV , and B
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20. Which of the following are pure substances?

I. Concrete
11. Wood
Table salt
IV. Milk
V. Copper
a. I only
b. II and IV
IV and V
d. III and V
III, IV, and V
e.lll, lV , and B

User Skymook
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3 votes
the answer is III and V
User Rtimoshenko
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