CAIE AS Chemistry 10.1 Group 2 Metals and Compounds

Practise Group 2 reaction equations and trends in reactivity, thermal stability and compound solubility, using decomposition and periodic patterns to predict chemical behaviour.

Exam points

write reactions of Group 2 metals and compounds with oxygen, water and dilute acids
compare nitrate and carbonate thermal stability and identify the gaseous decomposition products
use opposing hydroxide and sulfate solubility trends to identify or predict a Group 2 element

Covered syllabus points

10.1.1—Reactions of the elements with oxygen 10.1.2—Reactions of the oxides, hydroxides 10.1.3—Thermal decomposition trends 10.1.4—Describe, and make predictions 10.1.5—Variation in the solubilities

[Maximum number: 4]

(a)

State what is observed when dilute hydrochloric acid is added to separate samples of barium oxide and barium carbonate.
barium oxide
barium carbonate

[ 2 ]

(b)

Write an equation for the reaction of strontium, Sr , with an excess of cold water.

[ 1 ]

$\mathrm{Sr}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Sr}(\mathrm{OH})_{2}+\mathrm{H}_{2}$

(c)

State the variation in solubility of the Group 2 sulfates down the group.

[ 1 ]

[Maximum number: 1]

Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.

Nitrogen is found in inorganic compounds such as nitrogen oxides ( $\mathrm{NO}_{x}$ ), nitrates and nitric acid.

Describe what is seen when solid calcium nitrate is heated strongly.

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Covered syllabus points

10.1 Trends in Group 2 metals and compounds question 1

Question (a)

Question (b)

Question (c)

10.1 Trends in Group 2 metals and compounds question 2