C5- Chemical Changes

Question 1

Whats is the nemonic to remember the reactivity with series?

Answer 1

Please stop calling me a cute zebra tom likes her calling sam giant

Question 2

How do Potassium, sodium, lithium and calcium react with water?

Answer 2

They fizz and give off hydrogen gas leaving a solution of a metal hydroxide

Question 3

How do potassium, sodium and lithium react with dilute acid?

Answer 3

Explode

Question 4

How do magnesium aluminium and zinc react with water?

Answer 4

They have a very slow reaction

Question 5

How do calcium magnesium aluminium and zinc react with dilute acid?

Answer 5

Fizz, giving off hydrogen gas and form a salt

Question 6

How do tin and lead react with water?

Answer 6

They slight react with steam

Question 7

How do tin and lead react with dilute acid?

Answer 7

They react slowly with warm acid

Question 8

Oxidation

Answer 8

The loss of electrons

Question 9

Reduction

Answer 9

The gain of electrons

Question 10

How do metals displace each other?

Answer 10

A more reactive metal will displace a less reactive metal from its aqueous solution

Question 11

What is an ionic equation?

Answer 11

It shows only the atoms and ions (with charges) that change in the reaction

Question 12

Why are most metals found in the earth as compounds?

Answer 12

Because many metals can react with other elements or oxygen ti form compounds or oxides

Question 13

Whats a metal ore?

Answer 13

It contains enough of the metal to make it economic to extract the metal (the ores are mined)

Question 14

How are metals above carbon in the reactivity series extracted?

Answer 14

By electrolysis

Question 15

How are metals above hydrogen in the reactivity series extracted?

Answer 15

Reduced from its ore by heating with carbon

Question 16

How is copper extracted from its ore?

Answer 16

Reduced from its ore by reacting with hydrogen

Question 17

Which metals in the reactivity series are found native ?

Answer 17

Silver gold and platinum

Question 18

Whats a salt?

Answer 18

A compound formed when the hydrogen in an acid is wholly or partially replaced by metal or ammonium ions

Question 19

Whats is the product of a reaction between metal+acid?

Answer 19

A salt+ hydrogen

Question 20

What salt is produced when hydrochloric acid reacts with a metal ?

Answer 20

Chloride

Question 21

What salt is produce when sulphuric acid reacts with a metal?

Answer 21

Sulfate

Question 22

What salt is produced when nitric acid reacts with a metal?

Answer 22

Nitrate

Question 23

Base

Answer 23

Compounds that neutralise acids

Question 24

Alkalis

Answer 24

Bases that are soluble in water

Question 25

What are the products of a reaction between acid+base(alkali) ?

Answer 25

A salt+ water

Question 26

What is the product of a reaction between acid+ a carbonate?

Answer 26

A salt + water+ carbon dioxide

Question 27

Acids

Answer 27

Substances that contain hydrogen and produce H+ (aq) ions when you add to water

Question 28

Whats the difference between a concentrated solution and a dilute solution?

Answer 28

A conc solution contains a greater amount of the solute in the same volume than a dilute solution

Question 29

Why do we not react alkali (group 1) metals with acid?

Answer 29

Reaction would be too violent and not safe

Question 30

Why do we dilute solutions? And what with?

Answer 30

We dilute with water (or another solvent) to make it weaker and safer

Question 31

What are strong acids?

Answer 31

Harmful when conc have to be diluted

Question 32

What are weak acids?

Answer 32

Not harmful when diluted or even sometimes when concentrated

Question 33

What must acids dissolve in before they can show their properties?why?

Answer 33

Water, as in water all acids are ionised

Question 34

What happens when weak acids dissolve in water?

Answer 34

They do not ionise most of the time and even if they do they reaction is reversible

Question 35

What ions do acids release when dissolved in water?

Answer 35

H+(aq)

Question 36

Give an example of a strong acid?

Answer 36

Hydrochloric acid Sulphuric acid Nitric acid

Question 37

Give an example of a weak acid?

Answer 37

Ethanoic acid Citric acid Carbonic acid

Question 38

What would the pH value be for a conc of H+(aq) ions of 0.10?

Answer 38

1.0

Question 39

What would the pH value be for a conc of H+(aq) ions of 0.010?

Answer 39

2.0

Question 40

What is the conc of H+(aq) ions when the pH value is 3.0?

Answer 40

0.0010