Section 2 - Pgs 34, 43

Question 1

Acid + Metal ->

Answer 1

Acid + Metal -> Salt + Hydrogen

Question 2

How does magnesium react with dilute acids?

Answer 2

• Vigorously (even with cold acid)

- Produce lots of bubbles

Question 3

How does aluminium react with dilute acids?

Answer 3

• Vigorously (only with warm acid)

- Produces lots of bubbles

Question 4

How does zinc react with dilute acids?

Answer 4

• Slowly (but more quickly with warm acid)

- Produces few bubbles

Question 5

How does iron react with dilute acids?

Answer 5

• Very slowly (but more quickly with warm acid)

- Produces very few bubbles

Question 6

What salts does hydrochloric acid produce?

Answer 6

Chloride salts

Question 7

What salts does sulphuric acid produce?

Answer 7

Sulfate salts

Question 8

Describe the test for water.

Answer 8

Water turns anhydrous copper(II) sulphate powder from white to blue (hydrated copper sulphate).

Question 9

Describe IN DETAIL the preparation and test for water.

Answer 9

Preparation:
1) Get some copper(II) sulphate, which forms blue crystals when bound to water.
2) Heat the blue hydrated copper(II) sulphate to remove water.
3) This leaves a white anhydrous copper(II) sulphate powder, with no water bound to it.
Test:
1) Add some of the substance to the White anhydrous powder.
2) If water is present, the white powder turns blue. If it isn’t, there is no change.

Question 10

What does pure mean in terms of a sample?

Answer 10

That the sample only contains one substance.

Question 11

How can you test whether a sample is pure?

Answer 11

It has set defined physical properties, like boiling point and freezing point.
E.g. Pure water always boils at 100C and freezes at 0C.

Question 12

How can you test whether a sample is pure?

Answer 12

It has set defined physical properties, like boiling point and freezing point.
E.g. Pure water always boils at 100C and freezes at 0C.