Big Idea 9: Changes in Matter

1. Jerome put water in the freezer and made ice. Which of the following happened?

• Water underwent a chemical change

• Water changed from a solid to a liquid

• Water changed from a gas to a solid

• Water changed from a liquid to a solid

During condensation, which change best describes what happens to water?

• a gas changes to a liquid

• a gas changes to a solid

• liquid changes to a gas

• liquid changes to a solid

How does heat affect an ice cube?

• turns it to snow

• turns in to a solid

• causes it to melt

• does not change it

Liquid water is heated up and turned into a gas, called water vapor. When it is cooled down, it condenses and turns back into a liquid. Is this a physical or chemical change?

• Chemical, but it completely changed into something new

• Physical because it completely changed into something new

• Physical because it was able to turn back into a liquid

• Chemical because it was able to turn back into a liquid

1. A mixture of yeast, water, and sugar were placed into a balloon and the balloon was tied. The pictures below show the balloon at the beginning and the balloon after one hour.

****Look at the image to solve correctly.

• physical

• chemical

• scientific

• no change

Which two properties of a crayon will stay about the same after the crayon is melted into a liquid?

• shape and physical state

• temperature and hardness

• color and mass

• thickness and texture

Which of the following will result in a substance with new chemical properties? (chemical change)

• shredding newspaper

• breaking a mirror

• popping popcorn

• burning wood

Ms. Maher is baking a cake. She puts flour, sugar, cake mix, eggs and vanilla into her bowl. She then puts in the oven. Is this an example of a physical or chemical change?

• chemical because we can not reverse the baking of the ingredients and something new was formed: a cake

• physical because we can not reverse the baking of the ingredients and something new was formed: a cake

• chemical because we can reverse the baking of the ingredients and something new was formed: a cake

• physical because we can reverse the baking of the ingredients and something new was formed: a cake

Ms. Petion went to the beach and swam in the ocean. When she got home, she noticed her beach towel had dried and there was salt left on her towel from the ocean. What could have caused this?

• ocean water condensed and left salt on the towel

• ocean water evaporated in to salt

• ocean water evaporated from her towel, leaving the salt residue on her towel

• she poured salt on her towel on accident

Ice cream in a bowl changed from solid to a liquid in a few minutes. Which of the following most likely caused this change?

• Bacteria grew on the ice cream.

• heat was added to the ice cream

• when water evaporates, sugar was left in the cup

• sprinkles were added to the ice cream