Exploring Changes in Matter

Which of the following best describes the Law of Conservation of Mass?

• Mass can be created and destroyed in a chemical reaction.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is always increased in a chemical reaction.

• Mass is always decreased in a chemical reaction.

Tags

NGSS.MS-PS1-5

What is the main difference between an open system and a closed system in terms of matter exchange?

• An open system allows energy but not matter to be exchanged with the surroundings.

• A closed system allows both energy and matter to be exchanged with the surroundings.

• An open system allows both energy and matter to be exchanged with the surroundings.

• A closed system allows only matter to be exchanged with the surroundings.

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

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

Tags

NGSS.MS-PS1-4

Identify the chemical change from the following options.

• Dissolving sugar in water

• Freezing water

• Digesting food

• Cutting paper

Tags

NGSS.MS-PS1-2

In a chemical reaction, what term is used to describe the substances that are present before the reaction takes place?

• Products

• Reactants

• Catalysts

• Inhibitors

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following statements is true about exothermic reactions?

• They absorb heat from the surroundings.

• They release heat to the surroundings.

• They neither absorb nor release heat.

• They only occur in closed systems.

Tags

NGSS.MS-PS3-3

What is the main characteristic of an endothermic reaction?

• It releases light.

• It absorbs heat.

• It releases sound.

• It absorbs sound.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which of the following is a synthetic material?

• Cotton

• Wool

• Nylon

• Silk

Tags

NGSS.MS-PS1-3

Which of the following is considered a natural resource?

• Plastic

• Coal

• Polyester

• Glass

Tags

NGSS.MS-ESS3-1

What is a polymer?

• A single molecule

• A large molecule made up of repeating units

• A type of metal

• A type of gas