chemistry flashcards y8 elsie

Question 1

what does solute mean

Answer 1

the substance that dissolves

Question 2

what does solvent mean

Answer 2

the liquid that the substance is dissolving in

Question 3

what order are the elements in a periodic table in

Answer 3

they are arranged in mass order which is order of atomic number

Question 4

which way do the periods go

Answer 4

horizontal

Question 5

which way do the groups go

Answer 5

vertical

Question 6

how many known elements are there

Answer 6

118

Question 7

what does it mean if certain elements are in the same row

Answer 7

because they have similar chemical properties

Question 8

what similar chemical properties do group one have

Answer 8

they are reactive metals
low melting points
all react with water to produce hydroxide and hydrogen

Question 9

what similar chemical properties do group 0 have

Answer 9

un-reactive non metals
non metals
gases
colourless
found in earths atmosphere in little amounts

Question 10

what symbol is gold

Answer 10

Au

Question 11

what symbol is magnesium

Answer 11

Mg

Question 12

what chemical symbol is iron

Answer 12

Fe

Question 13

what chemical symbol is potassium

Answer 13

k

Question 14

what chemical symbol is sodium

Answer 14

Na

Question 15

what elements are in group one

Answer 15

Lithium
sodium
potassium
Rubidium
caesium

Question 16

what elements are in group 0

Answer 16

helium
neon
argon
Krypton
xenon
radon
oganesson

Question 17

what similar chemical properties do group 7 have

Answer 17

non metals
distinctive smell
coloured ]low melting points
less reactive as you move down the group

Question 18

what is the characteristic of a dilute acid

Answer 18

sour and Sharpe taste and is mixed with water

Question 19

what is a base

Answer 19

a base is a substance that can react with an acid to neutralise it.the base and the acid cancel each there out.

Question 20

a alkali is

Answer 20

a base dissolved in water

Question 21

what is the example of a base?alkali

Answer 21

toothpaste
oven cleaner
baking powder

Question 22

what is an acidic solution

Answer 22

when a acid is dissolved in water

Question 23

what is an alkaline solution

Answer 23

when a base is dissolved in water

Question 24

what is is called when something isn acid solution or alkaline solution

Answer 24

its called neutralPure

Question 25

what colour is a acid on the scale

Answer 25

red

Question 26

what its an alkaline on the scale

Answer 26

purple

Question 27

what is an element

Answer 27

when a substance is only made up of only one kind o atom

Question 28

what is a compound

Answer 28

a compound is a substance that contains atoms of two or more different elements chemically joined together

Question 29

is air a mixture and why or why not

Answer 29

air is a mixture as it has carbon and oxygen and nitrogen in but not chemically joined together

Question 30

what has to happen for it to be classified as a chemical reaction

Answer 30

a new substance has to be made

Question 31

what isn't classified as a chemical reaction

Answer 31

if there is not a new substance just physical differences

Question 32

what happens in a chemical reaction with the atoms

Answer 32

chemical bonds between atoms are broken and made, so the atoms get rearranged into new substances. but are all still there none have been taken away

Question 33

what is a compound containing a metal and a non metal called in displacement reactions

Answer 33

salts

Question 34

can a metal and salt have a displacement reaction with the same metal

Answer 34

no as the metal can't take the same metal as there's no displacement in reactivity

Question 35

what is one way to detect the reactivity of a metal

Answer 35

the temperature rises so the higher the temperature the higher the reactivity

Question 36

what is the meaning of fuel

Answer 36

a substance that stores energy and can be burned to release it

Question 37

what are the changes of state

Answer 37

solid to liquid=melting liquid to gas=evaporting gas to solid=condensing

Question 38

what is distillation

Answer 38

Distillation is a separation technique used to separate a solvent from a mixture . For example, water can be separated from salt solution by distillation. Distillation involves boiling the mixture and then condensing the gas to produce a liquid

Question 39

what is combustion

Answer 39

Combustion is another word for burning. In a combustion reaction, a fuel is heated and it reacts with oxygen.

Question 40

what are the three things needed for combustion

Answer 40

heat ,fuel and oxygen

Question 41

what is neutralisation reaction

Answer 41

An acid and alkali will neutralise each other and produce a salt and water. This is called a neutralisation reaction.

Question 42

what is thermal decomposition

Answer 42

Thermal decomposition is a chemical reaction that happens when a compound breaks down when heated.

Question 43

what is precipitation reaction

Answer 43

A precipitation reaction is one in which substances in solution are mixed and an insoluble product is made. The insoluble product is called a precipitate and can be seen as a solid forming in the reaction mixture.

Question 44

what is a molecule

Answer 44

a particle made of two or more atoms joined