5. What is chemical formula of table salt?
a. NaCl
b. ClNa
c. Na2Cl
d. NaCl2
6. Which of the following is not a pure substance?
a. hydrogen
b. oxygen
c. water
d. milk
7. Which substance can be decomposed by a chemical change?
a. carbon
b. boron
c. magnesium
d. methanol
8. Which substance cannot be decomposed by a chemical change?
a. water
b. carbon
c. citric acid
d. carbon dioxide
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5. A. NaCI
6. D. Milk
7. D. Methanol
8. B. Carbon
Answer:
1.A
2.C
3.A
4.A
Explanation:
I didn't know if it was right but I just tried