what i dont know

Question 1

3 examples of home acid

Answer 1

citric
acetic acid
lactic acid

Question 2

3 examples of lab acids

Answer 2

sulphuric
nitric
hydrochloric

Question 3

3 examples of lab alkalis

Answer 3

potassium hydroxide
calcium hydroxide
sodium hydroxide

Question 4

3 examples of home alkalis

Answer 4

sodium carbonate
sodium bicarbonate
ammonia solution

Question 5

chemical properties of metal

Answer 5

reacts with acid to make salts

Question 6

physical properties of metals

Answer 6

shiny
malleable
solid at room temperature exp mercury

Question 7

chemical properties of non metal

Answer 7

form negative ions
reacts with oxygen to form acidic oxides

Question 8

physical properties of non metals

Answer 8

dull
brittle
poor conductor of head and energy exp graphite

Question 9

chemical properties of halogens group 17

Answer 9

highly reactive
form acid with hydrogen eg hydrochloric acid

Question 10

physical properties of group 17 halogens

Answer 10

varied states
coloured glasses
brittle poor conducer

Question 11

chemical properties of group 1 metal alkalis

Answer 11

highly reactive
react with halogens to form ionic salts eg sodium chloride

Question 12

physical properties of group 1 metal alkalis

Answer 12

soft
low density (some float on water)
low melting points

Question 13

physical properties of group 1 metal alkalis

Answer 13

soft
low density (some float on water)
low melting points

Question 14

what does burning metals and non metals in oxygen form?

Answer 14

oxides

Question 15

which kind of oxides acts like a alkali

Answer 15

metal oxides

Question 16

oxides are a mixture/element/compound/solution

Answer 16

compound

Question 17

oxides are oxygen and a _______ chemically bonded

Answer 17

singular element

Question 18

when non metals dissolve in water, they make a…

Answer 18

acidic solution

Question 19

sodium oxide is a compound of what?

Answer 19

sodium + oxygen

Question 20

_____ + water ➡️ alkali

Answer 20

base

Question 21

most of the time you need _____ for reactions with oxygen to take place

Answer 21

heat/ fire/ bunsen burner

Question 22

what is a alkali

Answer 22

a base that is soluble

Question 23

what is a base

Answer 23

a substance that can neutralise acids

Question 24

what is the law of conservation of mass

Answer 24

total mass before and after chemical reaction is same

Question 25

what colour flame does sodium have

Answer 25

Yellow

Question 26

independent variable

Answer 26

the variable getting changed (because it’s independent it gets ready by itself)

Question 27

what is dependant variable

Answer 27

the one being measured or tested

Question 28

what is a control variable

Answer 28

variable that does not change (it is being controlled so it can’t change)

Question 29

what is density

Answer 29

Density is how heavy something is for its size. It’s found by dividing mass by volume.

Question 30

3 physical properties of noble gasses

Answer 30

no colour no smell
no reactivity
low boiling and melting points

Question 31

3 chemical properties of noble gasses

Answer 31

don’t react with other chemicals
intert ( no reactivity )
reactivity decreases down the group

Question 32

what is the difference between distillation and evaporation

Answer 32

distillation collects the evaporated gas but evaporation focuses on just removing solvent from solute

Question 33

what does evaporation separate

Answer 33

solute from solvent

Question 34

what does distillation separate

Answer 34

mixtures

Question 35

what does filtration separate

Answer 35

insoluble solid from substance