C5

Question 1

what would be the PH of a

neutral substance ? 
a weak acid ? 
a strong acid ? 
a weak alkali ? 
a strong alkali ?

Answer 1

7 
5/6
1/2
7/8
13/14

Question 2

whats
an acid
a base
an alkali

Answer 2

an acid has a PH less than 7 , realises H+ ions

a base has a PH greater than 7

an alkali is a base that dissolves in water . PH greater than 7 , releases OH- ions

Question 3

whats a strong acid

Answer 3

one that fully dissociates to release

H+ ions

Question 4

whats a weak acid ?

Answer 4

one that only partially dissociates

Question 5

what do u get if u react a metal + acid

Answer 5

salt + hydrogen

Question 6

describe how a salt could be made from a metal and an acid

Answer 6

add excess metal to the acid 
allow it to fully react 
filter out the excess metal 
evaporate the water 
dry the salt in an oven

Question 7

whats made from an acid and a metal oxide

Answer 7

salt + water

Question 8

how could u make a salt from an acid and an alkali

Answer 8

do a titration
with a subtable indicator
repeat without the indicator
use crystallisation to obtain the salt

Question 9

whats made from an acid and a carbonate ?

Answer 9

salt + water + carbon dioxide

Question 10

the ionic equation for neutralisation :

Answer 10

H+ + OH- = H2O

Question 11

when metal reacts with water what products are made ?

Answer 11

hydrogen hydroxide

Question 12

whats

Oxidisation

Reduction

Answer 12

Oxidisation is when a substance gains oxygen

Reduction is when a substance loses oxygen

Question 13

how is metal extracted from its ore if its more reactive than carbon ?

Answer 13

by electrolysis

Question 14

hows metal extracted if its less reactive than carbon ?

Answer 14

by heating with carbon - reduction reaction

Question 15

when a metal oxide dissolves in water does it make an acid or alkali

Answer 15

metal oxide = alkali

non-metal oxide = acid