Question

1. match the substance with the state of matter

ice cubes
a) liquid
c) gas
b) solid

1. match the substance with the state of matter

sand
a) solid
c) gas
b) liquid

1. match the substance with the state of matter

nitrogen
a) gas
b) solid
c) liquid

1. match the substance with the state of matter

orange juice
a) gas
b) liquid
c) solid

1. all of the following are examples of physical changes except

a) melting
c) solidifying
b) burning
d) evaporating

1. which of the following is an example of a chemical change?

a) melting wax
c) bending a pop can
b) burning paper
d) evaporation of milk

1. an example of a chemical change is

a) frying a hamburger
c) mashing potatoes
b) dew disappearing from the grass
d) magnet sticking to the refrigerator

1. photosynthesis is a chemical reaction which uses ____ as a form of energy

a) iron
c) light
b) heat
d) gravity

Explanation:

1. Ice cubes are in solid - state as they have a definite shape and volume.
2. Sand is a solid as it has a definite shape and volume.
3. Nitrogen is a gas under normal conditions as it has no definite shape or volume and fills the container it is in.
4. Orange juice is a liquid as it has a definite volume but takes the shape of its container.
5. Melting, solidifying, and evaporating are physical changes. Burning is a chemical change as it involves a chemical reaction and formation of new substances.
6. Melting wax, bending a pop - can, and evaporation of milk are physical changes. Burning paper is a chemical change as new substances like ash and gases are formed.
7. Frying a hamburger involves chemical reactions due to heat, so it is a chemical change. Dew disappearing is evaporation (physical change), and a magnet sticking is a physical interaction.
8. Photosynthesis is a chemical reaction that uses light energy to convert carbon dioxide and water into glucose and oxygen.

Answer:

1. b) solid
2. a) solid
3. a) gas
4. b) liquid
5. b) burning
6. b) burning paper
7. a) frying a hamburger
8. c) light