Question 1

Which of the following is NOT a chemical change?

Accepted Answer

Dissolving sugar in water

Answer

Burning a log of wood

Answer

Baking a bread

Answer

Frying an egg

Question 2

Which of the following is a sign that a chemical change is taking place?

Accepted Answer

smelling an offensive odor

Answer

watching something dissolve in water

Answer

a substance is melted at high heat

Answer

the ability to break an object into pieces

Question 3

Which of the following situations show chemical change?

Accepted Answer

Rust forms on a hammer that has been left outside too long.

Answer

A rock breaks into smaller pieces when it is struck with a hammer.

Answer

A solid is formed when heat is removed from a sample of water.

Answer

A cup of water turns pink when a few drops of red food coloring are added.

Question 4

What happens to the particles of a substance after undergoing a chemical change?

Accepted Answer

New bonds are formed between particles of the substances.

Answer

Bonds between particles of the substances are broken.

Answer

Energy is absorbed or released by the particles.

Answer

All of the above

Question 5

Physical change is a change in the physical properties of a substance such as size or shape. Which of the following is NOT a physical change?

Accepted Answer

Burning a log of wood

Answer

Dissolving sugar in water

Answer

Crushing a can

Answer

Breaking a glass

Question 6

A phase change is a physical process in which a substance goes from one phase to another. When does phase change occur?

Accepted Answer

Heat is added to or removed from the substance.

Answer

A substance is combined with another substance.

Answer

Particles of the substance maintain their kinetic energy.

Answer

Particles of the substance are not changing their motion.

Question 7

What happens to the particle arrangement of a liquid when it changes to gas?

Accepted Answer

Particles move distant from each other in random motion.

Answer

Particles move close to one another and become ordered.

Answer

Particles do not move. Particles are close together with no regular arrangement.

Answer

None of the above

Question 8

Which is evidence of chemical change?

Accepted Answer

Appearance of new substance

Answer

Increase of temperature

Answer

Formation of new shape

Answer

Drastic change of size

Question 9

A student mixed two clear liquids together. After a few minutes, a white powdery solid was seen and settled at the bottom of the test tube. What conclusion can be made based on the observations cited above?

Accepted Answer

The liquids have gone through a chemical change in which a precipitate was formed.

Answer

The liquids have been stored too long and no longer good.

Answer

The liquids are toxic and should be handled with caution.

Answer

The liquids were pure substances before they were mixed.

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