Heat 1 (Physical and Chemical Changes)

One type of cold remedy is an effervescent tablet that breaks down in water. When the tablet is placed in water, it forms gas bubbles. In this example, the formation of a gas

• is a physical property.

• occurs when adding water to acid.

• is a sign of a chemical change.

• occurs when the water boils.

Tags

NGSS.MS-PS1-2

What changes occur when an ice cube is heated to a temperature above 100°C?

• The ice cube will change from a liquid to a solid.

• The ice cube will change from a gas to a liquid.

• The ice cube will change from a solid to a liquid to a gas.

• The ice cube will change from a solid to a liquid and then back to a solid.

Tags

NGSS.MS-PS1-4

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

• The mass of the balloon increases because the size of the balloon has increased.

• The mass of the balloon increases because the temperature of the balloon has increased.

• The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

• The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which describes a chemical change?

• sugar dissolving in tea

• sunshine warming a sidewalk

• scissors cutting paper into pieces

• acid in the stomach digesting food

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a chemical change?

• frying an egg

• boiling water

• breaking a glass cup

• crushing a piece of bread

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Examine the diagram above. What would a teacher most likely use this image to explain?

• Heat being added and taken away is causing physical changes in water.

• Air being added and taken away is causing physical changes in water.

• Heat being added and taken away is causing chemical changes in water.

• Air being added and taken away is causing chemical changes in water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which is the best example of a change that can be undone?

• clay put in an oven to harden

• cake batter put in an oven to bake

• chocolate left in a warm car to melt

Chris fit the pieces of a space shuttle model together. Which statement BEST describes how the pieces compare to the completed model?



• Each piece is stronger than the completed model.

• The mass of the completed model equals the mass of all the pieces.

• Each piece is made from a different material than the completed model.

• The mass of the completed model is more than the mass of the all the pieces.

Tags

NGSS.MS-PS1-5

A student pours ¼ cup of salt on a scale. The student then puts 3 cups of water in a container on the scale, and records the weight of the salt and the container of water. The student pours the salt into the container of water, and waits for it to dissolve. The student then weighs the salt and water solution. Which of the following best describes the weight of the salt and water mixture compared to the weight of the salt and water before they were mixed?

• The weight of the salt and water mixture will be the same, because the mass of the salt and the mass of the water did not change.

• The weight of the salt and water mixture will be less, because the salt lost some of its mass when it dissolved.

• The weight of the salt and water mixture will be more, because the salt molecules will inflate, causing the mass to increase.

• The weight of the salt and water mixture will be more because the water absorbs the salt, which increases in mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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.