c5- chemical changes

Question 1

how are metals ordered?

Answer 1

in order of reactivity by their reactions with water and dilute acid

Question 2

what gas is given off if metals react with water or dilute acids?

Answer 2

hydrogen

Question 3

what will happen if a more reactive metal reacts with a metal aqueous solution?

Answer 3

it will displace it

Question 4

what is oxidisation?

Answer 4

the loss of electrons

Question 5

what is reduction?

Answer 5

the gain of electrons

Question 6

what is a metal ore?

Answer 6

when there is enough metal in a rock to make it worth extracting the metal

Question 7

what metals can be extracted from their ores using carbon?

Answer 7

metals less reactive that carbon

Question 8

what metals can be extracted by electrolysis of the molten metal compound?

Answer 8

metals more reactive that carbon

Question 9

what is a salt?

Answer 9

a compound formed when the hydrogen in an acid is wholly/ partially replaced by metal or aluminium ions

Question 10

metal + acid=

Answer 10

a salt + hydrogen

Question 11

what is the reaction between a metal and an acid know as?

Answer 11

a redox reaction

Question 12

acid + base =

Answer 12

a salt + water

Question 13

acid + alkali =

Answer 13

a salt + water

Question 14

acid + a carbonate =

Answer 14

a salt + water + carbon dioxide

Question 15

what is an alkali?

Answer 15

a soluble hydroxide

Question 16

what is a base?

Answer 16

a substance that can neutralise acids

Question 17

what ph values do acids have?

Answer 17

less than 7

Question 18

what ph values do alkalis have ?

Answer 18

more than 7