Physical and Chemical Review

When baking soda and vinegar react, the product includes bubbles. What has most likely occurred?

• gas formation

• exothermic reaction

• precipitate formation

Tags

NGSS.MS-PS1-2

What is the best evidence for a chemical reaction?

• change of state

• cutting a metal

• color change

Tags

NGSS.MS-PS1-2

When a marshmallow is toasted over a fire, which is the best description for what happens to the outside of the marshmallow?

• physical change

• chemical change

• enzyme creation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is the best description for iron rusting quickly when exposed to water and salt?

• a change of state

• a chemical reaction

• a physical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best demonstrates a physical change?

• formation of a precipitate

• formation of a gas

• change in state

Tags

NGSS.MS-PS1-4

Liquids placed in a beaker will settle in specific layers. Which physical property of matter does this illustrate?

• density

• polarity

• solubility

• malleability

A piece of paper burns, producing heat and light. Which best describes the process of burning?

• Burning is a physical change. The paper mixes with the oxygen in the air, producing heat and light.

• Burning is a chemical change. The paper reacts with the oxygen in the air, producing heat and light.

• Burning is a physical change. The paper changes from a solid to a gas, producing heat and light.

• Burning is a chemical change. The paper breaks down in sunlight, producing heat and light.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best describes a solid produced in a solution during a chemical reaction?

• acid

• solute

• reactant

• precipitate

Which best describes the type of change that occurs when liquid water freezes to become ice and will float in liquid water?

• physical change in which the ice is less dense than the liquid water

• chemical change in which the ice is less dense than the liquid water

• physical change in which the ice is more dense than the liquid water

• chemical change in which the ice is more dense than the liquid water

Tags

NGSS.MS-PS1-4

Which is represented when liquid water becomes a gas at 100°C?

• density of water

• solubility of water

• boiling point of water

• chemical reactivity of water

Tags

NGSS.MS-PS1-4