Chemistry EOY revision

Question 1

Acid + Alkali =

Answer 1

Salt + Water

Question 2

Metal hydroxide + acid =

Answer 2

Salt + Water

Question 3

Metal Oxide + Acid =

Answer 3

Salt + Water

Question 4

Metal + Acid =

Answer 4

Salt + hydrogen

Question 5

Metal Carbonate + acid =

Answer 5

Salt + Water + CO2

Question 6

Charges on Group 3 metals
Boron (B)
Aluminum (Al)
Gallium (Ga)
Indium (In)
Thallium (Tl)

Answer 6

Boron (B) +3, -3
Aluminum (Al) +3
Gallium (Ga) +3
Indium (In) +3
Thallium (Tl) +1, +3

Question 7

Charges of common metals
Ag
Cu
Fe
Pb
Zn

Answer 7

Ag+
Cu2+
Fe2+ Fe3+
Pb2+
Zn2+

Question 8

Test for ammonia

Answer 8

Damp red litmus paper turns blue

Question 9

Test for Chlorine

Answer 9

damp blue litmus paper to red then white

Question 10

Test for Water

Answer 10

Anhydrous copper(II) sulfate (CuSO4) is a white crystalline solid that turns blue when it absorbs water vapour

Question 11

Ammonia
Sulfate
Carbonate
Hydroxide
Nitrate

Answer 11

NH4 +
SO4 2-
CO3 2-
OH-
NO3 -

Question 12

Phenolphthalein

Answer 12

Alkaline - Pink
Acidic - Colourless

Question 13

Methyl orange

Answer 13

Alkaline - Yellow
Acidic - Red

Question 14

Litmus

Answer 14

Alkaline - Blue
Acidic - Red

Question 15

How to carry out a titration

Answer 15

1.Wash burette using acid and then water
2. Fill burette to 100cm3 with acid with the meniscus’ base on the 100cm3
line
3. Use 25cm3 pipette to add 25cm3
of alkali into a conical flask, drawing alkali into the
pipette using a pipette filler
4. Add a few drops of a suitable indicator to the conical flask (eg: phenolphthalein
which is pink when alkaline and colourless when acidic)
5. Add acid from burette to alkali until end-point is reached (as shown by indicator)
6. The titre (volume of acid needed to exactly neutralise the acid) is the difference
between the first (100cm3
) and second readings on the burette)
7. Repeat the experiment until you get concordant results