Differences between the properties of metals and non-metals
4 marks · Normal| Oxide | Type | Reacts with acid? | Reacts with alkali? |
|---|---|---|---|
| CuO | Metal | Yes | No |
| SO2 | Non-metal | No | Yes |
| Al2O3 | Metal | Yes | Yes |
| CO | Non-metal | No | No |
Identify one oxide in the table that is amphoteric.
Give a reason for your answer to (a).
State which oxide in the table is neutral.
Name one oxide that reacts with alkalis to form salts.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Al2O3
(b) It reacts with both acids and alkalis.
(c) CO
(d) SO2
Also accept: a) Al2O3 b) It reacts with both acids and alkalis c) CO d) SO2
Common mistakes: Selecting CuO as amphoteric; Choosing SO2 as neutral
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Identifies Al2O3 as amphoteric.
B2 (b) · 1 mark · Gives reason: reacts with both acids and alkalis.
B3 (c) · 1 mark · Identifies CO as neutral oxide.
B4 (d) · 1 mark · States SO2 as oxide that reacts with alkalis to form salts.
Worked solution
a) Al2O3 is amphoteric. b) It reacts with both acids and alkalis. c) CO is the neutral oxide as it does not react with acids or alkalis. d) SO2 reacts with alkalis to form salts.