Chapter 2 Test

Question 1

The process in which a new kind of matter forms

Answer 1

Chemical Change

Question 2

The scientific law that in any physical or chemical change the total mass of the matter does not change.

Answer 2

Conservation of Matter

Question 3

The process in which one or more substances change into one or more different substances.

Answer 3

Chemical Reaction

Question 4

A chemical change is a change that produces one or more new

Answer 4

Substances

Question 5

Ex: When Charcoal burns, a chemical change occurs in which charcoal and oxygen form new _______________________. These new substances are ashes and gases that you cannot see.

Answer 5

Substances

Question 6

When a chemical change occurs, the ____________________ that make up the original substances rearrange to form new substances.

Answer 6

particles

Question 7

_________________________ of a chemical change may include the release of heat or light, a change in color, a new smell, gas bubbles, or formation of a solid.

Answer 7

Evidence

Question 8

The law of conservation of matter states that in any chemical change or physical change, the total __________________ of the matter does not change.

Answer 8

mass

Question 9

The combined _________ of the substances before a chemical change is the same as the combined mass of the substances after the chemical change.

Answer 9

mass

Question 10

When you observe one of more substances change into one or more new substances, you observe a chemical _______________.
Ex: nails rust as a result of a chemical reaction. The iron in the nails and oxygen gas from the air react to form rust.

Answer 10

reaction

Question 11

Chemical changes occur in the __________________ all the time.

Answer 11

kitchen

Question 12

Ex: A chemical change occurs when a chef makes fresh cheese. To make fresh cheese, the chef adds lemon juice to whole milk. Once the two liquid ingredients are mixed, _________________pieces start to form. The solid pieces, called curds, are chunks of the fresh cheese. They form as a result of a chemical change. To prepare the cheese to eat, the chef____________ the curd from the liquid.

Answer 12

solid, separates.

Question 13

A substance where different materials are put together but each keeps its own properties.

Answer 13

mixture

Question 14

A mixture in which the substances are evenly spread out and do not settle to the bottom of the container

Answer 14

solution

Question 15

In a mixture, different materials are placed together, but each material in the mixture keeps its own _______________________.

Answer 15

properties

Question 16

Ex: If you mix peanuts and raisins, each of the ____________________ keeps its own properties. You can easily separate the peanuts from the raisins.

Answer 16

substances

Question 17

A solution is a mixture in which substances are spread out _________________________ and do not settle to the bottom of the container.

Answer 17

evenly

Question 18

Example: If you place salt in water, the salt and water form a mixture. The salt seems to disappear. this is because the salt water is a _______________.

Answer 18

solution

Question 19

The substance that is dissolved in the solution is called the _________________.

Answer 19

solute

Question 20

the substance in which the solute is being dissolved is called the ______________________________.

Answer 20

solvent

Question 21

The components of a solution keep their own _______________________, but they usually cannot be separated easily as other mixtures. this is because the components of a solution are evenly __________________.

Answer 21

properties, mixed

Question 22

All solutions are _________________, but not all mixtures are solutions. Ex: Clear apple juice is a solution. Any samples of the juice are just alike, and there are no separate particles in the mixture.

Answer 22

mixtures

Question 23

Fresh squeezed orange juice is not a solution. You can see _______________ of orange in the mixture

Answer 23

chunks