Question

matter can change - questions

1. matter is
2. state something you can do to change matter
3. what happens when you heat solid ice?
4. solid ice ____________ to a liquid when you ____________ it up
5. explain how to change liquid water into steam.
6. do you need to freeze matter to turn it into a solid? ______________ explain using evidence from the text
7. in your own words, explain what a physical change means.
8. according to the article, solid wood can be cut to change its size and shape. give another example of a physical change by cutting
9. in your own words, explain what a chemical change means.
10. give an example of a chemical change.
11. write a short story about a time when you saw matter change size, shape, state, or appearance. be sure to name the matter that changed, how it changed, and why it changed.

Explanation:

1. Matter is anything that has mass and takes up space.
2. One can change matter by heating, cooling, cutting, etc. For example, heating ice changes its state.
3. When you heat solid ice, it melts and turns into liquid water.
4. Solid wax melts to a liquid when you heat it up.
5. To change liquid water into steam, you heat it to its boiling - point (100°C at standard atmospheric pressure). Heat energy causes the water molecules to move faster and break free from the liquid state to form a gas.
6. No, you don't always need to freeze matter to turn it into a solid. For example, molten metal can be cooled to form a solid without freezing in the sense of water - like freezing. Another example is that when molten wax cools, it becomes a solid.
7. A physical change means a change in the physical properties of matter such as size, shape, state (solid, liquid, gas), or appearance, without changing its chemical composition. For example, cutting paper or melting ice.
8. Another example of a physical change by cutting is cutting a piece of clay to change its shape and size.
9. A chemical change means a change in which one or more new substances are formed. Chemical bonds are broken and new bonds are formed.
10. An example of a chemical change is burning wood. Wood reacts with oxygen in the air to form carbon - dioxide, water vapor, and ash.
11. One day, I saw an ice - cube on the kitchen counter. The matter that changed was water in the form of ice. It changed from a solid to a liquid. It changed because the room temperature was higher than the melting - point of ice, so heat energy from the surroundings was transferred to the ice, causing it to melt.

Answer:

1. Anything that has mass and takes up space.
2. Heat it (or other valid answers like cool it, cut it).
3. It melts into liquid water.
4. Melts; heat it up.
5. Heat it to 100°C at standard atmospheric pressure. Heat energy makes water molecules move faster and become steam.
6. No. For example, molten wax cools to become a solid.
7. A change in physical properties like size, shape, state, or appearance without changing chemical composition.
8. Cutting a piece of clay.
9. A change where new substances are formed and chemical bonds are broken and new ones are formed.
10. Burning wood.
11. An ice - cube on the kitchen counter changed from solid to liquid. The matter was water. It changed because of heat transfer from the surroundings as the room was warmer than the ice's melting - point.