Question

1. which best explains why melting ice is a physical change instead of a chemical change? a it does not smell bad. b it changes from a solid to a liquid. c it does not form a new substance. d it changes quietly with no loud sound. 12. which best describes what happens when water condenses on a glass? a a physical change occurs, because the water changes form. b a physical change occurs, because the water changes color. c a chemical change occurs, because the water gives off light. d a chemical change occurs, because the water forms a new substance. 13. water is boiled and water vapor forms. which best describes this process? a a chemical change occurs because a completely new substance forms. b a chemical change occurs because the temperature of the water changes. c a physical change occurs because the water disappears as it is absorbed by air. d a physical change occurs because water and vapor are different states of the same substance. 14. which change would result in a new substance being formed? a sugar dissolving in water b a glass bottle breaking c ice melting in a bowl d a metal can rusting

Explanation:

1. For question 11, a physical change does not create a new substance. Melting ice just changes its state from solid to liquid without forming a new substance.
2. For question 12, when water condenses on a glass, it changes from a gas (water - vapor) to a liquid. This is a change in form, which is a physical change, and no new substance is formed.
3. For question 13, boiling water to form water vapor is a phase - change. Water and water vapor are the same substance in different states, so it is a physical change.
4. For question 14, rusting of a metal can is a chemical change because a new substance (rust, which is an iron oxide) is formed. Sugar dissolving in water, a glass bottle breaking, and ice melting are all physical changes as no new substances are formed.

Answer:

1. C. It does not form a new substance.
2. A. A physical change occurs, because the water changes form.
3. D. A physical change occurs because water and vapor are different states of the same substance.
4. D. a metal can rusting