Group 2 UPDATED Exam Questions and CORRECT Answers
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Grado
Group 2
Institución
Group 2
Group 2 UPDATED Exam Questions and
CORRECT Answers
Use the Periodic Table to deduce the full electron configuration of calcium. - CORRECT
ANSWER- 1s2 2s2 2p6 3s2 3p6 4s2
Write an ionic equation, with state symbols, to show the reaction of calcium with an excess of
water. - CORRECT ANSWER- C...
Group 2 UPDATED Exam Questions and
CORRECT Answers
Use the Periodic Table to deduce the full electron configuration of calcium. - CORRECT
ANSWER- 1s2 2s2 2p6 3s2 3p6 4s2
Write an ionic equation, with state symbols, to show the reaction of calcium with an excess of
water. - CORRECT ANSWER- Ca(s)+ 2H2O(l) → Ca2+(aq) + 2OH-(aq) + H2(g)
State the role of water in the reaction with calcium. - CORRECT ANSWER- Oxidising agent
Write an equation to show the process that occurs when the first ionisation energy of calcium
is measured. - CORRECT ANSWER- Ca(g) → Ca+(g) + e-
State and explain the trend in the first ionisation energies of the elements in Group 2 from
magnesium to barium. - CORRECT ANSWER- Decrease
Ions get bigger / more (energy) shells
Weaker attraction of ion to lost electron
Calcium hydroxide is slightly soluble in water at room temperature. As the temperature rises,
the solubility decreases. When the maximum amount of solid has dissolved at a particular
temperature the solution is said to be saturated.
In an experiment, the solubility of calcium hydroxide was measured over a range of
temperatures. The results are shown in the graph.
Use data from the graph to calculate the concentration, in mol dm−3, of a saturated solution
of calcium hydroxide at 30 °C. Give your answer to 3 significant figures.
Show your working. - CORRECT ANSWER- 0.155 g per 100 cm3
(0..1) × 10 = 0.0209 mol dm−3
You are given a sample of saturated calcium hydroxide solution. Outline the practical steps
that you would take to determine the solubility of calcium hydroxide in
this solution. - CORRECT ANSWER- Take a known volume of the saturated solution
Evaporate the filtrate to dryness
, Weigh the residue of known concentration
Zinc is similar to Group 2 metals and forms compounds containing Zn2+ ions.
Write an equation for the thermal decomposition of zinc carbonate to zinc oxide.
Calculate the percentage atom economy for the formation of zinc oxide from zinc
carbonate in this reaction. - CORRECT ANSWER- ZnCO3 → ZnO + CO2
Percentage atom economy =
81..4
x 100
= 64.9
A laboratory technician discovered four badly−labelled bottles, each containing one pure
white solid. Each bottle contained a compound of a different Group 2 metal (magnesium,
calcium, strontium and barium).
Some tests were carried out on the solids or, if the compound was soluble, on the aqueous
solution. The results are given in the table.
One of the bottles has a very faint label that could be read as 'Magnesium Sulfate'.
Use the information in the table to deduce which one of the four compounds is magnesium
sulfate and explain your answer. - CORRECT ANSWER- Compound 1
No visible change with H2SO4
Gives white precipitate with NaOH
The bottle containing Compound 2 has a 'TOXIC' hazard symbol.
Use the information in the table to identify Compound 2.
Explain both observations in the reaction with H2SO4(aq). - CORRECT ANSWER- BaCO3
The carbonate ion releases CO2 but the BaSO4 formed is highly insoluble.
Identify the compound that is strontium hydroxide.
Give an equation for the reaction of strontium hydroxide with sulfuric acid. - CORRECT
ANSWER- Compound 4
Sr(OH)2 + H2SO4 → SrSO4 + 2H2O
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