c4 chemical changes

Question 1

what is the reactivity of a metal
related to?

Answer 1

the tendency to form positive ions

Question 2

why are carbon and hydrogen included in the reactivity series?

Answer 2

they give you information about how metals will react with them

Question 3

what is the reactivity series ordered in?

Answer 3

how reactive the elements are when reacting with water and dilute acids

Question 4

what is the reactivity series?

Answer 4

(very reactive)
1. potassium
2. sodium
3. lithium
4. calcium
(fairly reactive)
5. magnesium
6. carbon
7. zinc
8. iron
(not very reactive)
9. hydrogen
10. copper

Question 5

what can be done to metals that are less reactive than carbon?

Answer 5

they can be extracted from their ores by reduction with carbon

Question 6

what does it mean when a metal is more reactive than hydrogen?

Answer 6

it can also react with an acid

Question 7

what can happen if a metal is more reactive than another metal?

Answer 7

it can displace it

Question 8

what is the equation for a metal reacting with an acid?

Answer 8

metal + acid—> salt + hydrogen

Question 9

what indicated the speed of a metal acid reaction?

Answer 9

the rate in which the hydrogen bubbles are given off

Question 10

what is the equation for when a metal reacts with water?

Answer 10

metal + water—> metal hydroxide + water

Question 11

which elements will react with water?

Answer 11

potassium, sodium, lithium and calcium

Question 12

which elements will not react with water?

Answer 12

zinc, iron and copper

Question 13

what does reduction involve in terms of oxygen?

Answer 13

the reduction of oxygen

Question 14

what does oxidation involve in terms of oxygen?

Answer 14

gain of oxygen

Question 15

how are some metals found?

Answer 15

in their pure state

Question 16

how are most metals found?

Answer 16

in compounds which require a chemical reaction to separate them

Question 17

why can some metals be reduced with carbon?

Answer 17

because carbon reacts with oxygen to form carbon dioxide

Question 18

what is oxidation in terms of electrons?

Answer 18

loss of electrons

Question 19

what is reduction in terms of electrons?

Answer 19

gain of electrons

Question 20

what happens in an oxidation redox equation?

Answer 20

the element loses electrons to become positively charged ions

Question 21

what happens in a reduction redox equation?

Answer 21

the ion gains electrons to become an atom

Question 22

what happens in a displacement reaction?

Answer 22

one element is replaced by a more reactive element

Question 23

what is the equation for metals reacting with oxygen?

Answer 23

metal + oxygen= metal oxide

Question 24

what the formula for an acid?

Answer 24

H and non metal

Question 25

what types of ions do acids form in an aqueous solution?

Answer 25

H+ ions

Question 26

whats the formula for a base?

Answer 26

metal oxide or metal hydroxide

Question 27

what can bases neutralise?

Answer 27

acids

Question 28

what is formed when a base neutralises an acid?

Answer 28

salt + water

Question 29

what is the formula for a salt?

Answer 29

metal non-metal

Question 30

what are alkalis?

Answer 30

bases that are soluble in water

Question 31

what ions do alkalis form in aqueous solutions?

Answer 31

OH- ions

Question 32

what does the pH scale tell us?

Answer 32

the acidity or alkalinity of a solution

Question 33

what are pHs of acids?

Answer 33

0-6

Question 34

what is the pH of a neutral solution?

Answer 34

7

Question 35

what are the pHs of alkali solutions?

Answer 35

8-14

Question 36

what happens when an alkali and acid react, in terms of ions?

Answer 36

H+ ions from acid and OH- ions from alkali react to form WATER

Question 37

what does the production of water in a reaction mean?

Answer 37

it is a neutralisation reaction

Question 38

what does the reaction between a acid and metal carbonate form?

Answer 38

salt + water + carbon dioxide