Chemistry: 1.1 - 1.3

Question 1

Compressed gas.

Answer 1

Explode if dropped or exposed to heat.

Question 2

Flammable.

Answer 2

Catches on fire.

Question 3

Oxidizer.

Answer 3

Oxygen fuels the fire.

Question 4

Poisonous.

Answer 4

Serious and immediate. Do not inhale or swallow, no skin contact.

Question 5

Biohazardous.

Answer 5

Infectious, carries diseases

Question 6

Corrosive.

Answer 6

Will burn the lungs if inhaled or the skin if touched.

Question 7

Reactive.

Answer 7

Do not expose it to water, may explode

Question 8

Toxic.

Answer 8

The effects of toxicity are not immediate, and they get worse with repeated exposure

Question 9

What does WHMIS stand for? What is its purpose?

Answer 9

Workplace, Hazardous, Materials, Information, System.
The WHMIS labels provide information about the hazards of materials and the precautions to take when handling them at school or work.

Question 10

What are the four states of matter?

Answer 10

Solid, Liquid, Gas, and Plasma

Question 11

What do STATES OF MATTER depend on?

Answer 11

Temprature.

Question 12

Physical Property

Answer 12

­Properties that can be OBSERVED or MEASURED without changing the
composition of the substance.

Question 13

Phichycal Change

Answer 13

When a substance undergoes a change that DOES NOT change its chemical composition.

Question 14

Chemical Property

Answer 14

Properties that can be OBSERVED or MEASURED only when the substance CHANGES to become an ENTIRELY DIFFERENT kind of substance. Ex.
-reaction with water + heat + acid
- behaviour in the air

Question 15

Chemical Change

Answer 15

When a substance combines with another to form a new substance. Ex. Pancake, expired milk - bacteria mix in with milk

Question 16

Pure Substance

Answer 16

-Material that contains only ONE kind of
particle.
* All pure substances can exist in three
states of matter (solid, liquid, gas).
* Each pure substance has its own set of
physical properties (colour, odour,
density, melting point, solubility).
* Examples: iron, gold, oxygen, table salt,
water, sugar, diamond.

Question 17

Mixture

Answer 17

• Material that combines two or more pure
  substances together.
• The physical properties of each pure
  substance still exist ­ but they may be
  hidden in the mixture.
• Examples: paint, smog, ocean water, air,
  tossed salad, cement.

Question 18

Elements

Answer 18

Made up of only ONE type of particle.
* All elements are listed on the Periodic
Table.
Examples: copper, gold, silver,

Question 19

Compounds

Answer 19

• Made up of TWO or more elements.
• Compounds can be broken down into
  simpler substances.
  (water hydrogen + oxygen)
• Particles form molecules; and all the
  molecules are identical
  Examples: baking soda, salt, water,

Question 20

Homogenous (also called solution)

Answer 20

• Uniform in composition ­ looks like a
  pure substance (only one visible phase).
• Molecules are evenly dispersed. One
  substance dissolves in the other.
• Particles do NOT settle or separate.
• Different particles cannot be filtered
  apart.
  Examples: salt water, iced tea, coffee,

Question 21

Heterogeneous (also called mechanical mixture)

Answer 21

• Not uniform in composition ­ TWO visible
  phases.
• Different particles are visible.
• Particles are mixed but can be
  separated.
• Particles can be filtered.
  Examples: frozen vegetables, cereal and milk

Question 22

Colloids

Answer 22

• Larger particles are suspended in smaller
  ones.
• Particles do NOT settle.
• Particles are too small to be filtered or
  separated.
• Colloids are usually cloudy or opaque.
• Scatters light.
  Examples: cheese, paint, mayonnaise,

Question 23

Suspension

Answer 23

A heterogeneous mixture of a finely distributed solid in a liquid
* Largest particles suspended in a
substance.
* Particles will settle slowly after mixing.
* Particles can be filtered.
* Particles mix together but do not
dissolve.
* Does NOT scatter light.
Examples: sand in water, orange juice,
peanut butter,

Question 24

Changes in States of Matter.

Answer 24

melting (fusion) = solid to liquid
condensation = gas to liquid
freezing (solidification) = liquid to solid
evaporation = liquid to gas
sublimation = solid to gas
deposition = gas to solid

Question 25

What are some physical properties of matter?

Answer 25

color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point.