VALID Sample Test Review

Question 1

What are the three types of variables that you need to consider for an experiment

Answer 1

The independent, dependant and controlled variable(s)

Question 2

What is the independent variable and which axis do you plot it on

Answer 2

the variable you are changing, plot it on the x axis

Question 3

What is the dependant variable and which axis do you plot it on

Answer 3

the variable that you are measuring, plot it on the y axis

Question 4

What is a controlled variable

Answer 4

Things that need to be kept the same in an experiment

Question 5

What is a control sample

Answer 5

A way of comparing the results to a situation with no change

Question 6

what are 4 ways of separating compounds from a mixture

Answer 6

sorting by magnetism, particle size, insolubility and different boiling points

Question 7

How would I sort out iron filings from a mixture of sand

Answer 7

Magnet them out

Question 8

How would I sort out sand and salt from a mixture of sand, salt and water

Answer 8

Decant to get the sand out, boil the water and condense it via a distillation apparatus

Question 9

What is a distillation apparatus

Answer 9

a combination of condensation tubes, a bunsen burner and a beaker that separates insoluble things via boiling point

Question 10

What separation process do tea bags use

Answer 10

filtration

Question 11

What separation process is used when sifting flour

Answer 11

Using a sieve (particle size but bigger)

Question 12

What’s the difference between a sieve and filter paper

Answer 12

A sieve is like filter paper as it sorts via particle size, but filter paper does so at the molecular level

Question 13

What is the difference between validity and reliabillity

Answer 13

Validity is a measure of how accurately you address the aim whereas reliability how consistent your findings are with multiple trials

TLDR; validity = how well you address the aim, reliability = consistency

Question 14

what is the name of the process when a liquid turns into a solid

Answer 14

Freezing

Question 15

what is the name of the process when a liquid turns into a gas

Answer 15

evaporation

Question 16

what is the name of the process when a solid turns into a gas

Answer 16

sublimation

Question 17

what is the name of the process when a solid turns into a liquid

Answer 17

melting

Question 18

what is the name of the process when a gas turns into a liquid

Answer 18

condensation

Question 19

What are the three types of heat transfer

Answer 19

conduction, convection and radiation

Question 20

In what kind of heat transfer do objects touch to transfer heat

Answer 20

conduction

Question 21

In what kind of heat transfer does hot air rise above cold air

Answer 21

convection

Question 22

In what kind of heat transfer does heat get transferred by electromagnetic waves (light energy)

Answer 22

radiation

Question 23

What is the SI for force

Answer 23

Newtons

Question 24

What is the SI for mass

Answer 24

kg

Question 25

Is mass the same as weight

Answer 25

No

Question 26

What is weight

Answer 26

The net gravitational pull an object feels

Question 27

What is the SI for time

Answer 27

seconds

Question 28

What is the SI for length

Answer 28

metres

Question 29

What is the SI for electric current

Answer 29

amperes (amps)

Question 30

What is the SI for temperature

Answer 30

Kelvin (K)

Question 31

What is the SI for luminosity

Answer 31

candela

Question 32

What is the SI for amount of substance

Answer 32

mole (mols)

Question 33

What is a LOBF

Answer 33

Line of Best Fit

Question 34

What is a COBF

Answer 34

Curve of Best Fit

Question 35

If the x axis is time, and it is in discrete amounts, should the gradient change

Answer 35

Yes

Question 36

Does the collar of the Bunsen Burner need to be open or closed for the safety flame

Answer 36

closed

Question 37

The statement "large icebergs break off Antarctica every 50-60 years" is an example of a prediction or generalisation

Answer 37

generalisation

Question 38

Can you break water down into simpler substances by boiling it

Answer 38

No, boiling is a physical, not chemical change

Question 39

You may choose more than one option to complete the sentence. The renewable energy resources that could provide power to the research stations on Antarctica are a) gas b)wind c)diesel d)solar power

Answer 39

wind and solar power (Yes, antarctica actually gets loads of sun, just none is absorbed cause of the ice

Question 40

What are the 4 spheres and what are they composed

Answer 40

Biosphere > life, Lithosphere > rocks, Atmosphere > air and Hydrosphere > water

Question 41

What is apparent magnitude measured in

Answer 41

measured in magnitudes, not candela

Question 42

What is the brighter star, Alpha Centauri (-0.28) or Sirius(-1.5)

Answer 42

Sirius --> smaller magnitude = brighter it seems from point A

Question 43

What is the apparent magnitude

Answer 43

Apparent magnitude is the observed brightness from a point, but doesn't usually reflect the actual the brightness of the star as it can be influenced by distance

Question 44

How is absolute magnitude a better measure than apparent magnitude and what are some shortcomings?

Answer 44

Absolute magnitude is better than apparent magnitude as it is the observed brightness from 10 parsecs (or 32.6 light years). It however needs to be measured from 10 parsecs

Question 45

What is the conversion between parsecs and light years

Answer 45

1:3.26156 or short form 3.262

Question 46

What is the difference between a prediction and generalisation

Answer 46

A prediction is a forecast of the future, while a generalisation is a summary of a recurring trend

Question 47

Put these terms from simple to complex: tissues, systems, atoms, organs, cells, molecules, proteins

Answer 47

atoms, molecules, proteins, cells, tissues, organs, systems