C(s) + 2S(g) → CS2(g)
ΔH = +89 kJ mol-1
The chemical equation above implies that
each of carbon and sulphur has 89 kJ of energy
both carbon and sulphur contribute 89 kJ of energy
89 kJ of energy is released
89 kJ of energy is absorbed
Correct answer is D
No explanation has been provided for this answer.
tribasic
unionizeable
monobasic
dibasic
Correct answer is C
No explanation has been provided for this answer.
What current in amperes will deposit 2.7g of aluminium in 2 hours?
[Al = 27, F = 96 500 C mol-1]
32
8
4
16
Correct answer is C
Al3+ + 3e → Al
3 * 96500 → 27
I = 3600 * 2 → 27
I = (2.7/27) * ((3 * 96500)/(3600 * 2))
= 4.025 ≈ 4
The bonds in the reacting molecules are more readily broken
The molecular collisions become more violent
A lower proportion of the molecules has the necessary minimum energy to react
The collision frequency of the molecules increase
Correct answer is D
No explanation has been provided for this answer.
A metal M displaces zinc from zinc chloride solution. This shows that
M is more electronegative than zinc
Zinc is above hydrogen in the series
M is more electropositive than zinc
Electrons flow from zinc to M
Correct answer is C
No explanation has been provided for this answer.