Chemistry Review

Question 1

What is a heterogeneous mixture? (3)

Answer 1

1. There is no dissolving. 2. Materials can be separated. 3.All components can be seen.

Question 2

What is a homogeneous solution? (3)

Answer 2

1. There is dissolving. 2. Looks the same throughout. 3. Composed of a solvent and a solute.

Question 3

What is a solvent?(1)

Answer 3

1. Dissolves solute in solution.

Question 4

What is a solute?(1)

Answer 4

1. Being dissolved by solvent in solution.

Question 5

Define dissolving.

Answer 5

Dissolving is when the larger crystal of molecules in a solute break down upon contact of the solvent.

Question 6

Name the steps of the formation of a solution in order.

Answer 6

1.Place solute in solvent. 2. Molecules within the solvent move to create space for the solute. 3. Interaction between the solvent and solute continue until the concentration of both is equal.

Question 7

What does it mean when a substance is soluble? (1)

Answer 7

1. It can dissolve in liquids.

Question 8

What does it mean when a substance is insoluble?(1)

Answer 8

1. It cannot dissolve in liquids.

Question 9

What are the methods of separating heterogeneous mixtures? (9)

Answer 9

1. Paper chromatography. 2. Filtration. 3. Evaporation. 4. Magnetism. 5. Centrifuge. 6. Settling. 7. Sieves. 8. Separating funnel. 9. Sublimation.

Question 10

What is surface tension? (1)

Answer 10

The force of attraction between water molecules.

Question 11

What force is responsible for causing surface tension? (1)

Answer 11

1. Cohesion.

Question 12

Bonus: Can you name two other forces associated with surface tension? (2)

Answer 12

1. Adhesion. 2. Capillary actions.

Question 13

What is carbon dioxide? (1)

Answer 13

1. A colorless gas with a sharp odor and slightly sour taste.

Question 14

What is a chemical change? (2)

Answer 14

1. Matter changes to created a new substance. 2. Irreversible.

Question 15

What is a physical change? (3)

Answer 15

1. Matter changes its form. 2. No new substance forms. 3. Reversible.

Question 16

Signs of a chemical reaction. (5)

Answer 16

1. Odor change. 2. Energy change. 3. Gas bubbles. 4. Precipitate formation. 5. Color change.

Question 17

What does the pH scale determine? (1)

Answer 17

1. How acidic or basic a substance is.

Question 18

What number range shows acidic substances. (1)

Answer 18

1. 6-0

Question 19

What number range shows basic substances. (1)

Answer 19

1. 8-14

Question 20

What number shows a neutral substance? (1)

Answer 20

1. 7