11 markeasy
Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution?
Choose your answer
Ca(OH)2
Mg(OH)2
NH4Cl
BeCl2
Chemistry
6 questions · 6 marks · ≈ 6 min
Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution?
Choose your answer
Ca(OH)2
Mg(OH)2
NH4Cl
BeCl2
5.00 g of calcium carbonate is heated until it fully decomposes.
CaCO3 (s) → CaO (s) + CO2 (g)
What is the volume of CO2 produced, measured at RTP?
[Mr(CaCO3) = 100.1; Molar volume of a gas at RTP = 24 dm3 mol–1]
Choose your answer
1.1 dm3
1.2 dm3
2.4 dm3
120 dm3
Which statement about the reactivity of Group 2 elements with water is correct?
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Reactivity decreases down the group because ionic radius decreases
Reactivity decreases down the group because nuclear charge increases
Reactivity increases down the group because first ionisation energy decreases
Reactivity is constant down the group because all Group 2 elements form 2+ ions
What is the ionic equation for the reaction between aqueous solutions of barium nitrate and sodium sulfate?
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Na+ (aq) + N (aq) → NaNO3 (s)
2Ba+ (aq) + S (aq) → Ba2SO4 (s)
Na2+ (aq) + 2N (aq) → Na(NO3)2 (s)
Ba2+ (aq) + S (aq) → BaSO4 (s)
Data for some Group 1 and Group 2 cations are shown in the table.
| Cation | Ionic radius / nm | Ionic charge |
|---|---|---|
| W | 0.100 | +2 |
| X | 0.138 | +1 |
| Y | 0.113 | +2 |
| Z | 0.149 | +1 |
Which cation would be expected to form the nitrate with the greatest thermal stability?
Choose your answer
W
X
Y
Z
Magnesium nitrate decomposes on heating.
2Mg(NO3)2 → 2MgO + 4NO2 + O2
What is the total volume of gas formed at room temperature and pressure (r.t.p.) when 0.005 mol of magnesium nitrate decomposes completely?
[Molar volume of a gas at r.t.p. = 24 000 cm3 mol−1]
Choose your answer
600 cm3
300 cm3
240 cm3
120 cm3