In a chemical reaction in which sodium and chlorine are chemically combined to form salt, which of the following are the reactants?

• Sodium and chlorine

• Salt and chlorine

• Sodium and salt

• Salt only

Tags

NGSS.MS-PS1-1

In a chemical reaction in which sodium bicarbonate and vinegar are chemically combined to form carbon dioxide, water, and sodium acetate, which of the following are the products?

• Sodium bicarbonate and water

• Sodium acetate, water, and carbon dioxide

• Sodium bicarbonate and vinegar

• Carbon dioxide only

Tags

NGSS.MS-PS1-2

Which answer choice is NOT evidence that a chemical change occurred?

• The temperature changes.

• The reactants can be mixed.

• A new substance forms.

• A gas forms.

Tags

NGSS.MS-PS1-2

Both physical and chemical changes affect matter, but physical changes are __________ and chemical changes are __________.

• reversible, irreversible

• irreversible, reversible

• permanent, reversible

• temporary, permanent

Tags

NGSS.MS-PS1-4

An ice cube melts in a cup of water. Has a chemical reaction occurred?

• Yes, a new substance formed.

• Yes, a gas was given off.

• No, the color did not change.

• No, a phase change does not always indicate a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

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

• Rust forming on your bike

• A popsicle melting in the Sun

• Rolling a ball of dough into a flat pizza

• Boiling a pot of water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• Rust forming on your bike

• Sugar and butter being heated to form caramel

• Rolling a ball of dough into a flat shape

• Burning a log at a campfire

Which component represents a reactant in the diagram above?

• Carbon dioxide gas

• Water

• Baking soda

• Oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which component represents a product in the diagram above?

• Carbon dioxide gas

• Air

• Vinegar

• Baking soda

Tags

NGSS.MS-PS1-2

Baking soda and vinegar chemically change. What evidence from their combination supports a chemical change?

• The baking soda dissolves.

• A gas is produced.

• A mixture is formed.

• The color changes.

Tags

NGSS.MS-PS1-2