Chemical Reactions

Which example best describes a chemical change?

• wax melting
• an apple turning brown
• a piece of paper being cut into small pieces

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?

• chemical
• electrical
• thermal
• physical

Tags

NGSS.MS-PS1-2

Which best explains why burning leaves is a chemical change?

• The leaves emit light during the change. 
• The temperature of the leaves increases.
• The shape of the leaves changes.
• The leaves turn to ashes.

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

Tonya observes a mixture of two clear liquids in a container to see if a chemical change occurs. Which observation demonstrates the mixture is undergoing a chemical change?

• The mixture remains at a constant temperature.
• A gas forms after the liquids are mixed.
• One liquid floats on top of the other.
• The mixture does not change color.

Tags

NGSS.MS-PS1-2

Ramano is burning wood in a bonfire. What change is occurring during the fire?

• The wood is dissolving into liquid.
• The wood is gaining more mass.
• The wood is dissolving into a liquid.
• The wood is releasing a gas as smoke.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Which example best describes a physical change?

• baking a pie
• burning a candle
• making a paper airplane
• lighting a match

Which of these is an example of a new substance being formed?

• a nail rusting

• a wall being painted

• water changing to steam

• paper being folded

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an example of a different substance being formed?

• glass breaking

• metal melting

• water freezing

• wood burning

Tags

NGSS.MS-PS1-2

Examine the diagram. 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-PS1-4