Physical and Chemical Changes

Which of the following is an example that includes evidence of a chemical change?

• Water is boiled and turns to gas

• A solid block is ice is heated, and it completely melts into a liquid.

• An iron nail that turns rusty

• A sample of mineral is broken down into smaller pieces.

Tags

NGSS.MS-PS1-2

Monica and Andre are investigating the differences between physical and

chemical changes.

They list their observations below.

Physical changes

ice melting

a burning fire

Chemical changes

crushing a can

gas forming

cutting paper

Which of the following observations did Monica and Andre label incorrectly?

• ice melting

• a burning fire and crushing a can

• gas forming

• fireworks

Tags

NGSS.MS-PS1-4

A chemical reaction in a glow stick produces the light we see.

Doing which of the following will most likely decrease the rate of the chemical reaction in the glow stick?

• Shake the glow stick

• Put the glow stick in hot water

• Put the glow stick next to a light bulb

• Place the glow stick in a freezer

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

James has to provide an example of a physical change on his science test. Which of the following would be a correct response?

• An aluminum can being crushed

• Making a camp fire

• Baking a cake

• Making pancakes on the stove

The image shows what happens when fireworks go off.

What evidence would indicate that a chemical change has occurred?

• This is not a chemical change

• They come back to the ground

• They fly into the air

• Light is released

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Noah is baking a cake for his family. During which step of preparing the cake did Noah observe a chemical change?

• cracking an egg into the batter

• Mixing the batter together

• Adding baking soda into the batter

• Baking the cake in the oven

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens in a physical change that distinguishes it from a chemical change?

• In a physical change no new substances are produced

• The substance will change into a new substance but return back to the original substance eventually in a physical change

• A completely new substance forms in a physical change

• In a physical change a new substance is produced as a clone of the original substance.

Which answer shows all four signs of a chemical change?

• a gas forms, ripping, a an precipitate forms, unexpected color change

• a gas forms, a precipitate forms, an unexpected color change, and light or energy is released

• a gas forms, an unexpected color change, light or energy is released, and melting or freezing

• a precipitate forms, an unexpected color change, melting or freezing, and ripping

Tags

NGSS.MS-PS1-2

Which of the following shows all physical changes?

• a gas forming, melting or freezing, and dissolving

• ripping, melting or freezing, and dissolving

• a precipitate forms, melting or freezing, and dissolving

• an unexpected color change, dissolving, light or energy is released

Out of all the changes listed, which one is the physical change?

Light or energy is released

A gas is formed

A precipitate is formed

Melting

An unexpected color change occurs

• Light or energy is released

• A gas is formed

• Melting

• An unexpected color change occurs