Chemical and Physical Change

Ratliff cracks open an egg and finds that it has a very bad smell. The egg has turned rotten. This change is best described as...

• a. physical, because no new substances are formed
• b. physical, because a new substance was formed
• c. chemical, because no new substance are formed
• d. chemical, because a new substance was formed

Which change would be most difficult to reverse?

• a. melting an ice cube, because it is a physical change
• b. dissolving sugar in water, because it is a chemical change
• c. burning a match, because it is a chemical change
• d. rusting an iron nail, because it is a physical change

Scientists heat, boil, and evaporate 200 mL of water. Why is this an example ofa physical change?

• a. The water keeps the same chemical properties.
• b. Bubbles appear in the water.
• c. The water temperature increases to 100ºC.
• d. The water changes into a new substance.

Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

• a. chemical
• b. mechanical
• c. nuclear
• d. physical

While roasting marshmallows over a campfire, your marshmallow gets too close to the fire and bursts into flame. The stink of the burning marshmallow fills the air and by the time you blow the burning marshmallow out, the outside ofthe marshmallow is blackened, and the inside has melted. What types of

• a. outside: chemical , inside: physical
• b. outside: chemical , inside: chemical
• c. outside: physical , inside: physical
• d. outside: physical , inside: chemical

Which of the following is an example of a chemical change?

• a. frying an egg 
• b. melting an ice cube 
• c. cutting hair 
• d.cracking an egg 

When wood is completely burned, what happens to the matter in the wood?

• a. no matter is destroyed, all matter changes form
• b. some matter is destroyed, and some matter changes form
• c. some of the matter is destroyed, some matter is created
• d. all matter is destroyed

Which is an example of a physical change? 

• burning wood 
• rotting milk 
• cutting hair 
• decomposing road kill 

Which is an example of a chemical change? 

• coloring a paper 
• rusting steel wool 
• bending steel wool 
• freezing water 

What kind of properties can only be observed when a substance changes into a different substance? (A New Substance)

• physical properties

• chemical properties

• liquid properties

• real properties