Unit 2 Review

What is a physical change in matter?

• A change that results in the formation of a new substance

• A change that alters the appearance or state of a substance without changing its composition

• A change that involves a chemical reaction

• A change that cannot be reversed

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• Melting ice

• Dissolving sugar in water

• Burning wood

• Boiling water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How can you distinguish between a physical and a chemical change?

• By observing a change in color

• By checking if the change is reversible

• By determining if a new substance is formed

• By measuring the temperature change

Tags

NGSS.MS-PS1-2

What is the role of a solvent in a solution?

• It is the substance that is dissolved

• It is the substance that does the dissolving

• It is the solid part of the solution

• It is the gaseous part of the solution

In a saltwater solution, what is the solute?

• Water

• Salt

• Both water and salt

• Neither water nor salt

What does it mean for a solution to be saturated?

• It can dissolve more solute

• It has dissolved the maximum amount of solute possible

• It has no solute

• It is diluted

How does temperature generally affect the rate of dissolution for solids?

• Higher temperatures decrease the rate

• Higher temperatures increase the rate

• Temperature has no effect

• Lower temperatures increase the rate

Tags

NGSS.MS-PS1-4

What effect does increasing the surface area of a solute have on its rate of dissolution?

• It decreases the rate

• It increases the rate

• It has no effect

• It makes the solution saturated

Which factor does NOT affect the rate of dissolution?

• Temperature

• Surface area

• Agitation

• Color of the solute

What is the effect of agitation on the rate of dissolution?

• It decreases the rate

• It increases the rate

• It has no effect

• It makes the solution more concentrated