Topic 2: Changes in Matter

Question 1

Property

Answer 1

• Characteristic of a substance that helps it describe the substance
  Ex. solubility

Question 2

Physical Change

Answer 2

• A change the substances form but not in chemical composition
• No new substances are formed
  Ex. ice melting, ice freezing

Question 3

Chemical Change

Answer 3

• A change in the substances chemical composition
• Chemical substances are formed
  Ex. toast burning, baking cake

Question 4

Physical Properties of Matter

Answer 4

1. Melting point
2. Boiling point
3. Hardness
4. Malleability
5. Ductility
6. Crystal Shape
7. Solubility
8. Density
9. Conductivity

Question 5

Melting Point

Answer 5

• Temperature at which substance turns from a solid to a liquid

Question 6

Boiling Point

Answer 6

• Temperature at which substance turns from a liquid phase to a gas phase

Question 7

Hardness

Answer 7

• Substances ability to resist being scratched
• Hardness can be measured on the Moh’s hardness scale

Question 8

Malleability

Answer 8

• A substance that can be pounded or rolled into sheets is said to be malleable

Question 9

Ductility

Answer 9

• Any substance that can be stretched into a long wire is said to be ductile

Question 10

Crystal Shape

Answer 10

• Shape of a substance crystals

Question 11

Solubility

Answer 11

• Ability of a substance to be dissolved in an liquid

Question 12

Density

Answer 12

• The amount of mass in a given volume in a substance

Question 13

Conductivity

Answer 13

• The ability of a substance to conduct electricity and heat

Question 14

What clues MAY show that a chemical change has taken place?

Answer 14

• Energy is absorbed or emitted
• A change in color or oder
• A liquid substance holds bubbles or a solid form
• Change is difficult to reverse

Question 15

Qualitative

Answer 15

• Characteristic of a substance that can describe it
• Quality

Question 16

Quantitive

Answer 16

• Characteristic that can be measured numerically
• Quantity