C5-Chemical Changes

Question 1

Metal + acid

Answer 1

Salt + hydrogen

Question 2

Metal oxide +acid

Answer 2

Salt +water

Question 3

Metal hyroxide + acid

Answer 3

Salt +water

Question 4

Metal carbonate+ acid

Answer 4

Salt+ water +carbon dioxide

Question 5

When an acid reacts with a base, what occurs?

Answer 5

A neutralisation

Question 6

What is a salt and hownis it formed?

Answer 6

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

Question 7

What is a base?

Answer 7

A metal oxide or hydroxide that can neutralise an acid to make a salt plus water

Question 8

What are alkalines

Answer 8

Bases which are soluble in water(can be dissolved)

Question 9

How do you know of something is an alkaki(opposite of an acid- a high pH)

Answer 9

if it ends in oxide or hydroxide

A base that is soluble in water

Question 10

Do alkalines disolve in water

Answer 10

Yes

Question 11

What are acids?

Answer 11

Substances that react with water to release H+ ions

Question 12

How do you know the pH level of a substance?

Answer 12

The more H+ ions the more acidic the substance is

The more h+, the lower on the pH scale

Question 13

How do we know if something is an acid

Answer 13

It will have H+ ions

Question 14

How do we know if something is an alkaline?

Answer 14

It will have H- ions

Question 15

Metal + water

Answer 15

Metal hydroxide + hydrogen

Question 16

In terms of electrons, what is oxidation?

Answer 16

Loss of electrons

Question 17

Im terms of electrons what is reduction?

Answer 17

Gain of electrons

Question 18

What is used to extract metals from their oxides and why?

Answer 18

Carbon because it is more reactive than most metals

Question 19

How are metals that are more reactive than carbon extracted?

Answer 19

Through electrolysis

Question 20

What is a salt?

Answer 20

A compound formed when the hydrogen in an acid is replaced with a metal

Question 21

What does hydrochloric acid produce when reacted with a metal

Answer 21

Salts that end in Chloride+ hydrogen

Question 22

When sulfuric acid reacts with a metal what does it produce?

Answer 22

Salts that end in sulfate + hydrogen

Question 23

Hydrochloric acid + magnesium?

Answer 23

Magnesium chloride + hydrogen

Question 24

Sulfuric acid + magnesium

Answer 24

Magnesium sulfate +hydrogen

Question 25

Why does Magnesium displace hydrogen from the acids?

Answer 25

Because it is more reactive than hydrogen

Question 26

What metals will displace hydrogen in acids to form metals chlorides/sulfates + hydrogen

Answer 26

Every metal I will get asked apart from Copper, silver, Gold and Platinium

Question 27

Acid + alkali

Answer 27

Salt + water

Question 28

What are indicators?

Answer 28

Substances which change colour when you add them to acids or alkalis

Question 29

What does the pH scale show?

Answer 29

How acidic a substance is

Question 30

What are substances that form H+ ions when added to water?

Answer 30

Acids

Question 31

What are substances that form OH- ions when added to water?

Answer 31

Alkalis

Question 32

How is the strength of an acid measured?

Answer 32

How fast CO2 is given off in reaction

Question 33

Strong acids _________ in a solution

Answer 33

Completely ionise

Question 34

What does ionise mean

Answer 34

Converted into ions

Question 35

What are the names of the three strong acids I need to know?

Answer 35

Hydrochloric acid
Nitric acid
Sulfuric acid

Question 36

What do weak acids do in aqeous solutions?

Answer 36

Partially ionise

Question 37

What three weak acids do i need to know?

Answer 37

Carbonic acid
Ethanolic acid
Citric acid

Question 38

What does the pH scale give us an idea off?

Answer 38

Concentration of hydrogen ions (H+)

Question 39

As the pH scale decreases by one unit………………

Answer 39

The concentration of hydrogen ions increase by ten times

Question 40

What does the concentration of a given acid tell us?

Answer 40

The amount of acid molecules in a given volume