SC.8.P.9.2 - Physical and Chemical Changes Test Prep

Chemical changes result in new substances, but physical changes do not. Which process is an example of a physical change?

• Sodium and water are combined and form sparks.
• Bleaching lightening hair color
• A loaf of bread being sliced into pieces.
• Sodium and chlorine are combined to form table salt.

There are several differences between chemical and physical changes. Which statement is true of a chemical change, but not true of a physical change?

• A chemical change can produce warmth.
• A chemical change can be easily changed back.
• A chemical change can separate a mixture into its components.
• A chemical change can combine substances without altering them.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change of matter takes place when one or more substances change into entirely new substances with different properties. Although physical changes affect the appearance of a substance, chemical changes affect its composition. Which process indicates that a chemical change is taking place?

• A lake freezes over into ice.
• A metal bar is rolled into a flat sheet.
• Vinegar bubbles when baking soda is added.
• Sand, water, and salt combine to form a mixture.

Tags

NGSS.MS-PS1-2

Rita wants to make some toast for breakfast. She puts a slice of bread in the toaster. After 10 minutes, Rita notices that the sides of the bread are black. What caused this chemical change to take place?

• added warmth
• added mass
• added volume
• added particles

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What should a scientist do if they want to speed up the chemical reaction?

• Increase the density of the substance
• Decrease the density of the substance
• Increase the temperature of the substance
• Decrease the temperature of the substances

When paper is burned, the mass of the remaining ash is less than the mass of the original paper.Which statement best describes this result?

• A. The ash is denser than the paper.
• B. Some of the mass is lost as it escapes in smoke.
• C. The mass of the ash cannot be accurately determined.
• D. Some of the paper’s matter is destroyed during the reaction.

Harry makes a salt solution, by combining 10 g of salt with 100 g of water. What is the total mass of the solution formed?

• A. 10 g
• B. 90 gg
• C. 100 g
• D. 110 g

Increasing the temperatureduring a chemical reaction willdecrease the amount of time ittakes to happen.

• True
• False

In the laboratory, Giselle has a mixture of water and rubbing alcohol. Giselle separates the water and alcohol by heating the mixture until the alcohol boils away. What happens as Giselle separates the mixture?

• A. displacement
• B. physical change
• C. chemical changes
• D. increased mas

Pablo is making a solution. He puts 1 g of sugar into 1 L of water. Which kind of change takes place when Pablo mixesthe sugar and the water?

• an energy change
•  a chemical change
• a physical change
• a thermal change