Educational worksheet for identifying states of matter: solid, liquid, or gas.

Problem Analysis:

The task involves classifying various substances as solid, liquid, or gas based on their physical states. Additionally, there are sentences to complete using the words solid, liquid, or gas.

Step-by-Step Solution:

#### Part 1: Classify Each Substance
We need to determine whether each substance is a solid, liquid, or gas. Here’s the classification:

1. Milk - Liquid
Milk flows and takes the shape of its container but has a definite volume.

2. Cookie - Solid
A cookie has a definite shape and volume and does not flow.

3. Oxygen - Gas
Oxygen is a gas at room temperature and pressure, meaning it expands to fill any container and does not have a definite shape or volume unless contained.

4. Fish - Solid
A fish has a definite shape and volume and does not flow.

5. Pencil - Solid
A pencil has a definite shape and volume and does not flow.

6. Maple syrup - Liquid
Maple syrup flows and takes the shape of its container but has a definite volume.

7. Shampoo - Liquid
Shampoo flows and takes the shape of its container but has a definite volume.

8. Cotton candy - Solid
Cotton candy has a definite shape and volume and does not flow.

9. Ice cube - Solid
An ice cube is frozen water and has a definite shape and volume.

10. Paint - Liquid
Paint flows and takes the shape of its container but has a definite volume.

11. Salt - Solid
Salt crystals have a definite shape and volume and do not flow.

12. Oil - Liquid
Oil flows and takes the shape of its container but has a definite volume.

13. Water vapor - Gas
Water vapor is the gaseous state of water and expands to fill any container.

14. Gasoline - Liquid
Gasoline flows and takes the shape of its container but has a definite volume.

15. Helium - Gas
Helium is a gas at room temperature and pressure, meaning it expands to fill any container.

16. Sand - Solid
Sand consists of small, solid particles that have a definite shape and volume.

#### Part 2: Complete the Sentences
We need to use the words solid, liquid, or gas to complete the sentences based on their properties.

1. A solid has a definite shape. It does not take the shape of its container. It also has a definite volume because it can be measured.
- Solid: Solids have a fixed shape and volume.

2. A liquid does not have a definite shape. It takes the shape of its container. It does have a definite volume because it can be measured.
- Liquid: Liquids take the shape of their container but have a fixed volume.

3. A gas does not have a definite shape. It sometimes takes the shape of its container and sometimes fills freely around you. These particles are not connected to each other and take up whatever space is available.
- Gas: Gases expand to fill any container and have no fixed shape or volume unless contained.

Final Answer:

#### Classification of Substances:
1. Milk - Liquid
2. Cookie - Solid
3. Oxygen - Gas
4. Fish - Solid
5. Pencil - Solid
6. Maple syrup - Liquid
7. Shampoo - Liquid
8. Cotton candy - Solid
9. Ice cube - Solid
10. Paint - Liquid
11. Salt - Solid
12. Oil - Liquid
13. Water vapor - Gas
14. Gasoline - Liquid
15. Helium - Gas
16. Sand - Solid

#### Completed Sentences:
1. A solid has a definite shape. It does not take the shape of its container. It also has a definite volume because it can be measured.
2. A liquid does not have a definite shape. It takes the shape of its container. It does have a definite volume because it can be measured.
3. A gas does not have a definite shape. It sometimes takes the shape of its container and sometimes fills freely around you. These particles are not connected to each other and take up whatever space is available.

Final Answer Boxed:
\[
\boxed{
\text{1. Liquid, 2. Solid, 3. Gas, 4. Solid, 5. Solid, 6. Liquid, 7. Liquid, 8. Solid, 9. Solid, 10. Liquid, 11. Solid, 12. Liquid, 13. Gas, 14. Liquid, 15. Gas, 16. Solid}
}
\]