Question

1. which state of matter has a fixed shape and volume and its molecules move very slowly? a) plasma b) solid c) liquid d) gas 20. when a gas turns into a liquid, it is called ____ a) melting b) freezing c) evaporation d) condensation 21. true or false? taste is not a physical property of matter a) false b) true 22. which of the following can be classified as matter? a) the letter a b) the month august c) an idea d) a lake

Explanation:

1. Matter has three main states: solid, liquid, and gas. Solids have a fixed shape and volume, and particles move slowly. Liquids have a fixed volume but take the shape of their container. Gases have no fixed shape or volume. Plasma is a fourth - state of matter.
2. Phase changes include melting (solid to liquid), freezing (liquid to solid), evaporation (liquid to gas), and condensation (gas to liquid).
3. Physical properties of matter are characteristics that can be observed or measured without changing the substance's chemical identity. Taste is a chemical property as it involves chemical reactions in the taste buds.
4. Matter is anything that has mass and takes up space. Letters, ideas, and months are not matter as they do not have mass and volume. A lake is matter as it is made up of water (a substance with mass and volume).

Answer:

1. b) Solid
2. d) Condensation
3. b) True
4. d) a lake