Identify changes in matter as physical or chemical

Which of the following is an example of a physical change?

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

What is the main difference between a physical change and a chemical change?

• Physical changes are reversible, while chemical changes are not.

• Chemical changes involve a change in state, while physical changes do not.

• Physical changes result in new substances, while chemical changes do not.

• Chemical changes are temporary, while physical changes are permanent.

Which of the following processes is a chemical change?

• Dissolving sugar in water

• Freezing water

• Digesting food

• Cutting paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Explain why rusting of iron is considered a chemical change.

• It involves a change in the physical state of iron.

• It results in the formation of a new substance, iron oxide.

• It is a reversible process.

• It only changes the appearance of iron.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a sign of a chemical change?

• Change in shape

• Change in temperature

• Change in size

• Change in texture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A student observes that a piece of metal has tarnished over time. What type of change is this, and why?

• Physical change, because it can be polished back to its original state.

• Chemical change, because it involves a reaction with oxygen.

• Physical change, because it only affects the surface.

• Chemical change, because it changes the metal's color.

Tags

NGSS.MS-PS1-2

Which of the following scenarios best illustrates a physical change?

• A candle burning

• A nail rusting

• Water boiling

• Bread baking

Describe the process of photosynthesis as a chemical change.

• It involves the physical transformation of sunlight into energy.

• It converts carbon dioxide and water into glucose and oxygen, forming new substances.

• It is a reversible process that changes the state of water.

• It only affects the color of the leaves.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following is not a characteristic of a chemical change?

• Formation of a precipitate

• Change in color

• Change in mass

• Production of gas

Tags

NGSS.MS-PS1-2

A student mixes vinegar and baking soda, resulting in bubbling and fizzing. What type of change is occurring, and what evidence supports this?

• Physical change, because the substances can be separated.

• Chemical change, because a gas is produced.

• Physical change, because the temperature remains constant.

• Chemical change, because the mixture changes color.

Tags

NGSS.MS-PS1-2