Chemical changes

Question 1

Metal+Oxygen–>

Answer 1

Metal oxide

Question 2

Metal+Acid–>

Answer 2

Salt( compound name)+Hydrogen

Question 3

Acid+ Carbonate–>

Answer 3

Salt+ Water+ Carbon Dioxide

Question 4

Acid+ Metal Oxide–>

Answer 4

Salt+ Water

Question 5

Acid+Hydroxide–>

Answer 5

Salt+ Water

Question 6

Metal+Non- Metal

Answer 6

Metal Non- Metallide

Question 7

Element+ Oxygen

Answer 7

Element oxide

Question 8

Oxidation

Answer 8

Gaining of oxygen or gaining of a element

Question 9

Reduction

Answer 9

If you loose a electron the element has been reduced

Question 10

Reactivity series

Answer 10

How reactive are element in order

Question 11

Reactivity series name em

Answer 11

Potassium
Sodium
Lithium
Calcium
Magnesium
Zinc
Iron
Copper

Question 12

Which elements react rapidly with water

Answer 12

Potassium
Sodium
Lithium

Question 13

Reacts quite rapidly element

Answer 13

Calcium

Question 14

No reaction with water elements

Answer 14

MAGNESIUM
Zinc
Iron
Copper

Question 15

What makes a metal more reactive than other metals

Answer 15

When a metal reacts they lose electrons form positive ions

Reactivity of a metal depends on the ability to lose electrons and become positive ions

Question 16

Which elements can be found in the earth as itself

Answer 16

Unreactive metals like platinum, gold and silver

This is because they don’t lose electrons that easily to become ions

Question 17

A more reactive element will replace

Answer 17

A less reactive element in a compound

Question 18

Ionic equations explain what…

Answer 18

what happens to each of the reactants during reactions

Question 19

Reactions between metal and acids …

Answer 19

redox reactions. This displaces hydrogen as a gas while the metal ions are left in the solution.

Question 20

salt from hydrochloric acid

Answer 20

chloride

Question 21

salt from sulfuric acid

Answer 21

sulfate

Question 22

salt from nitrate acid

Answer 22

nitrate

Question 23

A base … an acid

Answer 23

neutralizes

Question 24

reduction

Answer 24

when oxygen is removed or electrons are gained

Question 25

oxidisation

Answer 25

when oxygen is gained and electrons are lost

Question 26

Group 1 metal reaction with water

Answer 26

reactions get more vigorous as you go down the group

Question 27

Group 2 metals react with water

Answer 27

Do not react with water

Question 28

Zinc, iron, copper reaction with water

Answer 28

Do not react with water

Question 29

Group 1 metal reaction with acid

Answer 29

reactions get more vigorous as you go down the group

Question 30

group 2 metal reaction with acid

Answer 30

Observable reactions including fizzing and temperature increases

Question 31

Zinc, iron, copper reaction with acid

Answer 31

Zinc and iron react slowly with acid. Copper does not react with acid

Question 32

The reactivity of a metal...

Answer 32

refers to a tendency to form positive ions

Question 33

why are copper and hydrogen in the reactivity series if they are non-metals

Answer 33

they can be used to extract some metal from their ores, depending on their reactivity

Question 34

A more reactive element will... a less reactive element

Answer 34

displace

Question 35

What will happen at the negative electrode in an aqueous solution

Answer 35

Metal will be produced on the negative electrode if the metal s less reactive than hydrogen if the metal more reactive hydrogen will be produced

Question 36

What will happen at the positive elctrode in an aqueous solution

Answer 36

Oxygen is formed at the positive electrode unless it is haline( Chlorine, Iodine, Bromine)

Question 37

Process of electrolosys

Answer 37

When an ionic compound is melted or dissolved in an aqueous solution, the ions are free to move. These are then able to conduct electricity and are called electrolytes. Passing an electric current through electrolytes causes the ions to move to the elcetrodes

Question 38

Anode

Answer 38

Potitive electrode

Question 39

Cathdoe

Answer 39

Negative electrode

Question 40

Cations

Answer 40

positive ions that move to the negative cathode

Question 41

Anions

Answer 41

Negative ions that move to the positive cathode

Question 42

When is electrolysis used with molten compounds

Answer 42

When metal is too reactive to be extracted by reduction with carbon

Question 43

What is titration useful for

Answer 43

To measure the precise volumes of acid and alkalis that react with each other

Question 44

Titration method

Answer 44

1) Use the pipette to add 25 cm cubed of alkali to a conical flask and add a few drops of the indicator 2) Fill the burette with acid and note the starting volume Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix 3) Stop adding the acid when the end-point is reached(the appropriate colour change in the indicator happens). Note the final volume reading. Repeat steps 1 to 3 until you get consistent readings.

Question 45

Strong acid

Answer 45

Fully ionises in aqueous solutions

Question 46

Weak acids

Answer 46

Only partially ionises in aqueous solution

Question 47

The hydrogen concentration in acids

Answer 47

As the ph decreases by a unit ( becoming more acidic) the concentration of hydrogen increases *10

Question 48

Soluble salts

Answer 48

Can be made from reacting on acid and insoluble substances like a metal

Question 49

Production os soluble salts

Answer 49

Add the solid to the acid until no more dissolves. Filter of excess solid and then crystallise to produce solid salts.

Question 50

What does acid produce in aqueous solutions

Answer 50

Hydrogen ions

Question 51

What does alkalis produce in aqueous solutions

Answer 51

Hydroxide ions