science unit 1

Question 1

Define fluid:

Answer 1

A liquid or a gas with no set shape

Question 2

What are WHMIS symbols?

Answer 2

Workplace Hazardous Materials Information System

Question 3

Define “slurry” and provide an example.

Answer 3

A mix of liquid and solid (mud)

Question 4

Define “pure substance” and provide an example.

Answer 4

A substance made up of only one thing (water)

Question 5

Define “mixture” and provide an example.

Answer 5

2 or more pure substances mixed together (juice)

Question 6

define Heterogeneous mixtures:

Answer 6

the mechanical mixture which all the substances are easy to see (tea and tea leaves)

Question 7

define Suspensions

Answer 7

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

Question 8

define Colloids

Answer 8

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

Question 9

describe Homogenous mixtures:

Answer 9

A mixture that looks like its only one substance

or a solution

Question 10

describe Solutions

Answer 10

homogenous mixture

Question 11

Define solute and solvent and provide an example of each.

Answer 11

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

Question 12

What is concentration?

Answer 12

The amount of solute

Question 13

What is the formula for calculating concentration?

Answer 13

c=g/mL

Question 14

What are the units for concentration?

Answer 14

grams(g)

millilitres(mL)

Question 15

Which has a higher concentration: 20g of salt in 25mL or water OR 95g of salt in 100mL of water?

Answer 15

95g of salt in 100mL of water

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

Define saturation point.

Answer 19

The max amount of solute that can be dissolved

Question 20

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

Answer 20

It explains the behavior 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 21

What factors affect the rate of dissolving?

Answer 21

Temperature, amount of stirring, and size of particles

Question 22

Define “viscosity” and explain the effect of temperature on viscosity.

Answer 22

the rate something flows
hotter= faster
Colder= slower

Question 23

Define “density:”

Answer 23

amount of mass in a given volume

Question 24

What is the formula for calculating density? What are the units for density?

Answer 24

d=g/ml
grams(g)
millilitres(ml)

Question 25

Describe the effect of temperature on the density of a fluid.

Answer 25

``` hotter= flow faster cold= flow slower ```

Question 26

Define “buoyancy” and provide an example of a technology that utilizes buoyant force.

Answer 26

the ability to float | pismoioal lines

Question 27

Define “compressibility” and explain which compresses more, a liquid or a gas.

Answer 27

The ability to compress something | gas compresses better

Question 28

Define “pressure:”

Answer 28

amount of force applied to a given area

Question 29

What is the formula for calculating pressure?

Answer 29

p=f/a

Question 30

What are the units for pressure?

Answer 30

force area pressure pascals

Question 31

What is Pascal’s Law? Provide an example of a technology that utilizes Pascal’s Law.

Answer 31

pressure in a container applied equally in all directions | a hydraulic braking system in a car

Question 32

define Hydraulic System: | and provide an example

Answer 32

liquid under pressure to move loads | mechanical car lift

Question 33

define Pneumatic System: | and provide an example

Answer 33

gas under pressure to move loads | mechanical car lift

Question 34

define pump and provide an example

Answer 34

a device that moves fluids through something | tire pump

Question 35

define valve and provide an example

Answer 35

a device that controls the flow of liquids | sink nozzle