Chemical and Physical Changes Quiz

Scenario: A piece of paper is torn into small pieces. Does a chemical or physical change occur?

• Chemical change

• Physical change

• Change in state

• Change in color

Why does a physical change occur when a piece of paper is torn into small pieces?

• The paper disappears completely

• The paper turns into a different material

• The size and shape of the paper have been altered without changing its chemical composition.

• The paper becomes invisible

Scenario: Iron rusts when exposed to air. Does a chemical or physical change occur?

• Change in state

• Chemical change

• Physical change

• Change in color

Why does a chemical change occur when iron rusts?

• The composition of the iron is altered, resulting in the formation of a new substance.

• The color of the iron changes, indicating a chemical change

• The temperature of the iron increases, causing a chemical reaction

• The weight of the iron decreases, showing a chemical reaction

Scenario: Water evaporates when heated. Does a chemical or physical change occur?

• Change in state

• Chemical change

• No change

• Physical change

Why does a physical change occur when water evaporates?

• Release of heat energy

• Change in color

• Absorption of heat energy

• Formation of a new substance

Scenario: Milk turns sour. Does a chemical or physical change occur?

• chemical change

• emotional change

• spiritual change

• physical change

Why does a chemical change occur when milk turns sour?

• The milk is mixed with water

• The milk is exposed to too much sunlight

• The milk is too old to drink

• Lactic acid is produced by the breakdown of lactose in the milk.

Scenario: Ice melts into water when heated. Does a chemical or physical change occur?

• Physical change

• Chemical change

• Emotional change

• Biological change

Why does a physical change occur when ice melts into water?

• The ice absorbs heat from the surroundings, causing it to change into water

• The molecules in the solid ice rearrange themselves into the liquid state without changing their chemical composition.

• The chemical composition of the ice changes, leading to the formation of water

• The temperature of the ice increases, causing it to change into water