Question

mercury in a thermometer
*
Pure Substance
Mixture
copper wire
*
Pure Substance
Mixture
Air
*
Pure Subtance
Mixture
blood
*
Pure Substance
Mixture
hydrogen peroxide
*
Pure Subtance
Mixture
Concrete
*
Pure Substance
Mixture
tree bark
*
Pure Substance
Mixture
Pen Ink
*
Pure Subtance
Mixture
Pure Water
*
Pure Substance
Mixture
ocean water
*
Pure Substance
Mixture
paper
*
Pure Substance
Mixture
hot tea
*
Pure Substance
Mixture
gasoline
*
Pure Substance
Mixture
Sugar
*
Pure Substance
Mixture
Iron
*
Pure Substance
Mixture
milk
*
Pure Substance
Mixture
soda
*
Pure Substance
Mixture

Answer 1

Here are the classifications for the various substances listed:

1. **Mercury in a thermometer**:
- **Pure Substance**

2. **Copper wire**:
- **Pure Substance**

3. **Air**:
- **Mixture**

4. **Blood**:
- **Mixture**

5. **Hydrogen peroxide**:
- **Pure Substance** (when in a concentrated form; note that solutions can change this)

6. **Concrete**:
- **Mixture**

7. **Tree bark**:
- **Mixture**

8. **Pen Ink**:
- **Mixture**

9. **Pure Water**:
- **Pure Substance**

10. **Ocean water**:
- **Mixture**

11. **Paper**:
- **Mixture**

12. **Hot tea**:
- **Mixture**

13. **Gasoline**:
- **Mixture**

14. **Sugar**:
- **Pure Substance**

15. **Iron**:
- **Pure Substance**

16. **Milk**:
- **Mixture**

17. **Soda**:
- **Mixture**

If you need further clarification or have additional questions, feel free to ask!