term 3 science revision

Question 1

define matter

Answer 1

anything that has mass

Question 2

define mass

Answer 2

mass is a measurement of how much matter is in an object

Question 3

define volume

Answer 3

the amount of space a 3D shape takes up

Question 4

what is a pure substance?

Answer 4

A substance which only has one type of molecule

Question 5

what are the most common measuring units for volume?

Answer 5

mL and L

Question 6

what is a mixture?

Answer 6

a combination of two substances

Question 7

what is a homogenous mixture?

Answer 7

a homogenous mixture is a mixture where you cannot see the two different substances

Question 8

give an example of a homogenous mixture

Answer 8

saltwater - mixed (or if you come up with a different one search it up to make sure!)

Question 9

what is a heterogeneous mixture?

Answer 9

a heterogeneous mixture is a mixture where you can see two substances mixed together

Question 10

what is an example of a heterogeneous mixture?

Answer 10

gravel and sand (or if you come up with a different one search it up to make sure!)

Question 11

define a molecule

Answer 11

the smallest unit of a substance

Question 12

what is an observation?

Answer 12

something true that you have proof of (by seeing/hearing)

Question 13

what is an inference?

Answer 13

an educated guess based on the observation

Question 14

what are the metric units of mass - m? (hint: there’s 3 of them)

Answer 14

mg, g, kg

Question 15

what are the metric units of measurement - L? (hint: there’s 4 of them)

Answer 15

mm, cm, m, km

Question 16

what are the metric units of time? (hint: there’s 4 of them)

Answer 16

s, min, h, days

Question 17

what are the metric units of temperature? (hint: there’s 1 of them)

Answer 17

℃

Question 18

what is water’s melting point?

Answer 18

0℃

Question 19

what is water’s boiling point?

Answer 19

100℃

Question 20

what are the 3 states of matter?

Answer 20

solid, liquid, gas

Question 21

how do particles behave in a solid?

Answer 21

tight and compact

Question 22

how do particles behave in a liquid?

Answer 22

have more energy, break apart

Question 23

how do particles behave in a gas?

Answer 23

bouncing around in whatever space it’s in

Question 24

what does concentrated mean?

Answer 24

has a high amount of solute

Question 25

what does dilute mean?

Answer 25

has a higher amount of solvent than solute in a solution

Question 26

what does saturated mean?

Answer 26

has the maximum amount of solute that can be in a solvent

Question 27

what is a phase change?

Answer 27

when a state of matter changes due to heat or cold being applied

Question 28

what are the names of the phase changes?

Answer 28

sublimation, melting, freezing, condensation, evaporation, deposition

Question 29

define sublimation

Answer 29

where a solid transforms into a gas without becoming a liquid

Question 30

define deposition

Answer 30

where a gas transforms into a solid without becoming a liquid

Question 31

define suspension

Answer 31

a mixture of an insoluble substance in a liquid or gas

Question 32

define sediment

Answer 32

the insoluble material that collects at the bottom of a container when suspensions are left to stand

Question 33

define solution

Answer 33

when a solvent and solute are mixed together

Question 34

define colloid

Answer 34

a mixture not chemically combined

Question 35

define emulsion

Answer 35

a colloid where droplets of one liquid spread evenly through one another

Question 36

what’s chromatography?

Answer 36

the water expanding dye colours

Question 37

what’s decantation?

Answer 37

were you let the sediment settle and then you pore the solvent slowly so you just have sediment

Question 38

what’s distillation?

Answer 38

the really complicated one were there’s two liquids and you boil it to one of the liquids boiling temperatures so that you have them separated