Snapshot Review Units 2-5

Which of the following is an example that includes evidence of a chemical change?

• A. A sample of zinc is placed in water and it settles to the bottom.

• B. A solid block of ice is heated, and it completely melts into a liquid.

• C. Sugar that is burned gives off an odor and turns brown and then black.

• D. A sample of a mineral is broken down into smaller pieces.

The image shows what happens when cold medicine tablets are placed in room-temperature water.

What evidence would indicate that a chemical change has occurred?

• A. The tablets dissolve in water.

• B. The water becomes cloudy.

• C. The water level increases slightly.

• D. Bubbles are given off.

A physical change can be distinguished from a chemical change because this happens in a physical change:

• A. The properties of the substance may change, but no new substances are produced.

• B. The properties of the substance change for only a short time but will return to their original state.

• C. An entirely new substance with new properties forms as a result of the change.

• D. A new substance is produced, but the new substance has properties identical to the original substance.

During digestion the body uses both physical and chemical changes to move and process food. Which of the following is an example of a physical change?

• A. Teeth breaking food down into smaller pieces

• B. Protein is broken down into amino acids in the stomach

• C. Enzymes breaking down carbohydrates into simple sugars

• D. Hydrochloric acid breaking down fats in the stomach

Which of the following organisms transforms radiant energy into chemical energy?

• A. Butterfly

• B. Grass

• C. Mouse

• D. Deer

Mammals maintain a constant body temperature by converting radiant energy → thermal energy.

• A. Radiant energy → thermal energy

• B. Chemical energy → electrical energy

• C. Electrical energy → mechanical energy

• D. Chemical energy → thermal energy

Which of the following energy transformations takes place during digestion?

• A. Thermal energy → mechanical energy

• B. Mechanical energy → chemical energy

• C. Chemical energy → mechanical energy

• D. Solar energy → chemical energy

Animals can move as a result of what energy conversion?

• A. Chemical energy → mechanical energy

• B. Radiant energy → chemical energy

• C. Thermal energy → mechanical energy

• D. Mechanical energy → kinetic energy

Turgor pressure can help plants move. Internal water pressure can cause

• A. A wilted stem to return to an upright position.

• B. Leaves to fall off a tree in autumn.

• C. The roots of a plant to grow downward.

• D. A seedling to be carried by the wind.

Gravity and other forces affect movement within an animal’s body. Which system is responsible for the force that moves blood through the body?

• A. Endocrine system

• B. Circulatory system

• C. Skeletal system

• D. Nervous system