Changing Matter

Water is boiled and turns to vapor. The vapor is cooled and changes back into water. Which best describes what has occurred?

• a physical change, because the matter changed its state

• a chemical change, because the matter changed its state

• a physical change, because a new substance was formed

• a chemical change, because a new substance was formed

Brad accidentally left his crayon box in the car on a hot day. Which best explains what happened to his crayons?

• crayons melted; changed from solid to liquid

• crayons melted; changed from liquid to solid

• crayons evaporated; changed from liquid to solid

• the crayons didn't change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which best describes an activity that results in a new material being formed?

• plowing a field

• ironing a shirt

• burning wood

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

John filled a bottle half way with water, placed a lid on it, then put it in the freezer. How does the weight of the water and bottle compare before and after it is in the freezer?

• The water and bottle weigh the same as they did when they went in the freezer.

• The water and bottle weigh more when they come out of the freezer because ice weighs more.

• The water and bottle weigh less when they come out of the freezer because water evaporates when it gets cold.

Tags

NGSS.MS-PS1-2

A rock weighing 50 g is broken into 2 pieces. What are possible weights for the two pieces of rock?

• 20 g and 20 g

• 30 g and 20 g

• 30 g and 30 g

• 10 g and 30 g

Which best describes why deflating the air from a basketball is an example of a physical change?

• The basketball’s shape is changed.

• The basketball’s color is changed.

• The basketball’s size is changed.

• The basketball didn't change.

Amanda melted a 4-oz chocolate bar in a pot with a lid. What is most likely true about the weight of the melted chocolate?

• It weighs more than 4 oz.

• It weighs less than 4 oz.

• It weighs exactly 4 oz.

Ivy mixed 30 g of hot chocolate mix with 200 g of hot milk. She then added 5 marshmallows with a mass of 8 g each. Which best describes the mass of her hot chocolate?

• 235 grams

• 238 grams

• 243 grams

• 270 grams

Tags

NGSS.MS-PS1-2

A glass of salt water is put on a windowsill. After several days the water has disappeared, and there is only a film of white crystals left in the bottom. Which best explains what has happened?

• The salt caused the water to dry up.

• The water evaporated and left the salt behind.

• The water and the salt evaporated and left a film behind.

• The salt evaporated and left the water behind.

Tags

NGSS.MS-ESS2-4

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which is an example of a chemical change?

• melting ice to make water

• baking cake batter to make a cake

• putting cheese on bread to make a cheese sandwich

• pouring water from a pitcher to a glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5