Types Of Chemical Reactions

Question 1

Precipitate

Answer 1

The solids that forms in a solution during a chemical reaction

Question 2

Precipitate reactions

Answer 2

Chemical reactions where solids from when two solutions of soluble salts react

Question 3

Ion exchange reactions

Answer 3

Reactions where the positive ion exchange their respective negative ions due to a driving force

Question 4

Test for chlorides

1. Test
2. Observation
3. Confirmation

Answer 4

1. Add a few drops of AgNO3 to the halide solution and shake
2. A white precipitate of silver chloride forms ( AgCl(s) )
3. Add HNO3- if it doesn’t dissolve then the salt is a chloride

Question 5

Test for Bromides

1. Test
2. Observation
3. Confirmation

Answer 5

1. Add AgNO3
2. A cream coloured precipitate will form
3. Add HNO3 - If it doesn’t dissolve then it’s a bromide

Question 6

Test for iodine’s

1. Test
2. Observation
3. Confirmation

Answer 6

1. Add AgNO3
2. A yellow precipitate will form
3. Add HNO3 - if it doesn’t dissolve then it’s iodine

Question 7

Test for sulphates

1. Test
2. Observation
3. Confirmation

Answer 7

1. Add a few drops of either BaNO3 or BaCl2
2. A white precipitate of BaSO4
3. Add HNO3 - if it doesn’t dissolve then it’s sulphate

Question 8

Test carbonates (CO2 3-)

1. Test
2. Observation
3. Confirmation

Answer 8

1. Add Ba(NO3)2 or BaCl2
2. A white precipitate of BaCO3 forms
3. Add concentrated HNO3
   If it does dissolve and disappears then CO2 (g) is formed:
   BaCO3 + 2HNO3 —> Ba(NO3)2 + H2O + CO2