Question

4 fill in the blanks with the word physical to describe a physical change, or chemical to describe a chemical change. no new substance forming when matter undergoes a change combining multiple chemicals to change the water chemistry in a pool bending a glow stick to make it glow ironing a shirt before wearing it an artist burning a piece of wood to make an intricate design

Explanation:

• No new substance forming when matter undergoes a change: A physical change is defined as a change in which no new substances are formed.
• Combining multiple chemicals to change the water chemistry in a pool: This involves a chemical reaction as new substances are formed (change in water chemistry).
• Bending a glow stick to make it glow: Bending is a physical action, but the glow is due to a chemical reaction inside the glow stick.
• Ironing a shirt before wearing it: Ironing causes a physical change (smoothing the fabric), no new substances are formed.
• An artist burning a piece of wood to make an intricate design: Burning is a chemical reaction (oxidation), new substances (ash, gases) are formed.

Answer:

1. physical
2. chemical
3. chemical
4. physical
5. chemical