Choose the correct alternative.

1. Which of the following substances is an element?

quartz
carbon dioxide
water
gold
feldspar

2. Which of the following substances is not an element?

quartz
nitrogen
carbon
oxygen
hydrogen

3. Which of the following substances is a metal?

quartz
nitrogen
carbon
oxygen
iron

4. Which of the following substances is not a metal?

gold
copper
carbon
silver
aluminum

5. Which of the following is the chemical sign of iron?

Ra
C
H
Fe
O

6. Which of the following is the chemical sign of carbon?

Ra
C
H
Fe
O

7. What material does ore contain?

coins
carbon
oil
metal
oxygen

8. Which of the following materials does not come from a living organism?

crude oil
natural gas
coal
limestone
quartz