Chemical Changes

Question 1

Metal oxides are?

Answer 1

The product of the oxidation reaction of Metal and Oxygen.

Question 2

Metal produces what form of ion?

Answer 2

Positive ions

Question 3

What is a displacement reaction?

Answer 3

A reaction when a more reactive metal displaces a less reactive metal.

Question 4

How does Potassium react when exposed to water?

Answer 4

Violently

Question 5

How does Sodium react when exposed to water?

Answer 5

Very Quickly

Question 6

How does Lithium react when exposed to water?

Answer 6

Quickly

Question 7

How does Calcium react when exposed to water?

Answer 7

More Slowly

Question 8

How does Calcium react when exposed to dilute acid?

Answer 8

Very quickly

Question 9

How does Magnesium react when exposed to dilute acid?

Answer 9

Quickly

Question 10

How does Zinc react when exposed to dilute acid?

Answer 10

More slowly than magnesium

Question 11

How does Iron react when exposed to dilute acid?

Answer 11

More slowly than zinc

Question 12

How does Copper react when exposed to dilute acid?

Answer 12

Very slowly

Question 13

How does Silver react when exposed to dilute acid?

Answer 13

Barely reacts

Question 14

How does Gold react when exposed to dilute acid?

Answer 14

No reaction

Question 15

How is the order of reactivity affected?

Answer 15

Via a metals tendency to form its positive ion.

Question 16

Why are most metals found as compounds?

Answer 16

As most, unlike gold, are reactive enough to bond to other elements?

Question 17

How are most metals less reactive than carbon extracted?

Answer 17

Reduction with Carbon

Question 18

Oxidation in terms of electrons is?

Answer 18

Oxidation is the loss of electrons

Question 19

Reduction in terms of electrons is?

Answer 19

Reduction is the gain of electrons

Question 20

What are the products of the reactants metal and an acid?

Answer 20

Metal Salt and hydrogen

Question 21

How are acids neutralised?

Answer 21

Alkalis (soluble metal hydroxides) and basis (insoluble metal hydroxides and metal oxides).

Question 22

In a neutralization reaction, what are the products?

Answer 22

Metal salt and Water

Question 23

In a neutralization reaction which uses metal carbonates, what are the products?

Answer 23

Metal salts, water and carbon dioxide.

Question 24

How can a soluble salt be produced?

Answer 24

Reacting an acid with a solid insoluble substance.

Question 25

Solid salts are formed by?

Answer 25

Crystallization of a soluble salt

Question 26

Acids form what form of ion in an aqueous solution?

Answer 26

H+ ions

Question 27

Alkalis form what form of ion in an aqueous solution?

Answer 27

OH- ions

Question 28

What is Alkalinity measured in.

Answer 28

pH 0-14, measured using Universal indicator

Question 29

In a neutralisation reaction, what is formed?

Answer 29

Water, as OH- and H+ ions bond together

Question 30

What is a measuring by titration?

Answer 30

The method by which one can work out neutralising quantities of Acids and Alkalis.

Question 31

What is a strong acid?

Answer 31

An acid which completely ionis'.

Question 32

Name some examples of strong acids?

Answer 32

Hydrochloric, nitric and sulfuric acids.

Question 33

What is a weak acid?

Answer 33

An acid which only partially ionis'.

Question 34

Name some examples of weak acids?

Answer 34

Ethanoic, citric and carbonic acids.

Question 35

As pH decreases by one unit what happens?

Answer 35

The hydrogen ion concentration increases by a factor of 10

Question 36

What is required in electrolysis?

Answer 36

Free ions which can pass through a solution.

Question 37

A solution which has free ions and can conduct electricity is an?

Answer 37

Electrolyte

Question 38

In electrolysis, the positive electrode is?

Answer 38

The anode

Question 39

In electrolysis, the negative electrode is?

Answer 39

The cathode

Question 40

What happens at the electrodes during electrolysis?

Answer 40

Ions are discharged forming elements.

Question 41

What are the products of electrolysis of ionic compounds?

Answer 41

Metals at the cathode and | Non-metals at the anode.

Question 42

When is electrolysis used in extracting metals?

Answer 42

When a metal is more reactive than carbon or reacts with carbon.

Question 43

What are the products of electrolysis of aqueous soloutions?

Answer 43

At the cathode- Hydrogen is produced if the metal is more reactive. At the anode- Oxygen is produced unless the solution contains a halogen.