science unit 1

Question 1

Define fluid

Answer 1

A liquid or a gas with no set shape

Question 2

What are hazard symbols? What do the different shapes represent?

Answer 2

A warning symbol on hazardous materials:
Yellow triangle = caution
Orange diamond = warning
Red square = danger

Question 3

What are WHMIS symbols?

Answer 3

Workplace Hazardous Materials Information System

Question 4

Define “slurry” and provide an example.

Answer 4

A mix of liquid and solid (mud)

Question 5

Define pure substance and provide an example.

Answer 5

A substance made up of only one thing (water)

Question 6

Define mixture and provide an example.

Answer 6

2 or more pure substances mixed together (juice)

Question 7

whats a Heterogeneous mixtures

Answer 7

the mechanical mixture which all the substances are easy to see ( salad dressibf )

Question 8

whats suspension

Answer 8

A cloudy mixture with Pisces from one substance that stays in the middle of another substance it normally separates(salad dressing)

Question 9

whats colloids

Answer 9

Cloudy mixture where everything is too small to separate(milk)

Question 10

whats a homogeneous mixture

Answer 10

A mixture that looks like its only one substance

or a solution

Question 11

whats a solution

Answer 11

homogenous mixture

Question 12

What is paper chromatography and why is it useful?

Answer 12

If the substance you are testing is not pure it will separate but if it’s sure there will be no separation

Question 13

Define solute and solvent and provide an example of each.

Answer 13

The solute is a substance that dissolves into the solvent (Koolaid powder and water)

Question 14

What is concentration?

Answer 14

The amount of solute

Question 15

Which has a higher concentration: 10g of salt in 25mL or water OR 15g of salt in 100mL of water?

Answer 15

10 in 25

Question 16

Describe the difference between diluted and concentrated solutions.

Answer 16

Diluted=has small amount of solute

Concentrated= has a large amount of solute

Question 17

Define solubility.

Answer 17

Ability to dissolve mass of solute

Question 18

What three factors affect solubility?

Answer 18

Temperature, type of solute, type of solvent

Question 19

Describe the difference between saturated and unsaturated solutions.

Answer 19

saturated=no more solute can be dissolved at a given temperature
Unsaturated= you can still add more solute

Question 20

Define saturation point.

Answer 20

The max amount of solute that can be dissolved

Question 21

What does insolubility mean?

Answer 21

When the substance won’t dissolve in the solvent

Question 22

What is thermal pollution and why is it an issue?

Answer 22

When warm water goes into the cold river it kills all the wildlife in that body of water

Question 23

Define the particle model of matter and list its four main properties.

Answer 23

It explains the behaviour of solids liquids and gasses
Four main properties are:
All matter is made up of particles
Tiny particles are always moving and vibrating
May be attracted or bonding together
Have spaces between them

Question 24

What factors affect the rate of dissolving?

Answer 24

Temperature, amount of stirring and size of particals