N Chemical & Physical Changes - SC.8.P.9.2

(SC.8.P.9.2) Mrs. Flores asked her class to describe a chemical change. Which of the following descriptions is correct?

• A chemical change produces new substances with different properties than the original substances.
• A chemical change occurs whenever a substance is undergoing a change in its state.
• A chemical change can occur without changing the molecules of the substances.
• A chemical change does not affect the composition of a substance.

(SC.8.P.9.2) Jorge conducted an experiment, and included the graph shown below as part of his lab report. Jorge’s experiment involved which of the following?

• a chemical change
• a change in the chemical properties of a substance
• a physical change
• the formation of a new substance

(SC.8.P.9.2) Heavy rains can wash away (erode) soil and cause mudslides. Which of the following describes what occurs with soil erosion?

• a physical change
• a chemical change
• a change in chemical properties
• a change in composition

(SC.8.P.9.2) Dry ice changes from a solid directly into a gas at room temperature. The process of a change of state from a solid to a gas is called sublimation. What does sublimation demonstrate?

• the creation of a new substance
• a chemical reaction
• a chemical change
• a physical change

(SC.8.P.9.2) The illustration below shows Earth’s water cycle. Which of the following does Earth’s water cycle demonstrate?

• physical changes
• changes in chemical identity
• chemical changes
• chemical reactions

(SC.8.P.9.2) As Jose mixed two substances in a test tube, he noticed that the test tube became warm. He also noticed an odor coming from the test tube. Based on Jose’s observations, what was most likely occurring inside the test tube?

• changes in physical properties
• new substances were being formed
• a physical change
• the substances were melting

(SC.8.P.9.2) Which of the following is most likely evidence of a chemical change?

• An object gets smaller.
• An object changes state.
• A substance no longer occupies the same volume.
• A substance gives off heat and light.

(SC.8.P.9.2) The Statue of Liberty is made out of copper metal. When it was first constructed, the color of the copper metal was burnt-orange. However, over time it slowly developed a green color as it was exposed to air. What happened to the Statue of Liberty?

• a change in form
• a change in conductivity
• a chemical change
• a physical change

(SC.8.P.9.2) Which of the following best demonstrates a chemical change?

• splitting a wooden board into two pieces
• baking cookies
• bending a steel bar
• slicing carrots

(SC.8.P.9.2) As a person grows from a child into an adult, they grow taller. Growing taller is an example of a physical change. However, human growth also depends on chemical reactions inside the body. For example, digestion of food provides the nutrients that are needed by the body to grow. What can you conclude about the chemical and physical reactions involved in growth?

• A physical change can depend upon a chemical change.
• Growth does not involve either physical changes or chemical changes.
• Growth is the result of only physical changes.
• Chemical changes occur only during growth.