X is an impure sample of a Group 2 metal carbonate, $$$\mathrm{MCO}_{3}$$$. X contains $$$57 \%$$$ by mass of $$$\mathrm{MCO}_{3}$$$. The impurities in $$$X$$$ do not react with hydrochloric acid. 7.4 g of $$$X$$$ is reacted with an excess of dilute hydrochloric acid. 0.050 mol of the Group 2 metal chloride is produced. What is the identity of the Group 2 metal?

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_13 Year：2024 Question No：1

Answer:

Knowledge points:

1.3.1.1 shells, sub-shells and orbitals

1.3.1.2 principal quantum number (n)

1.3.1.3 ground state, limited to electronic configuration

1.3.2 describe the number of orbitals making up s, p and d sub-shells, and the number of electrons that can fill s, p and d sub-shells

1.3.3 describe the order of increasing energy of the sub-shells within the first three shells and the 4s and 4p sub-shells

1.3.4 describe the electronic configurations to include the number of electrons in each shell, sub-shell and orbital

1.3.5 explain the electronic configurations in terms of energy of the electrons and inter-electron repulsion

1.3.6 determine the electronic configuration of atoms and ions given the atomic or proton number and charge, using either of the following conventions

1.3.7 understand and use the electrons in boxes notation

1.3.8 describe and sketch the shapes of s and p orbitals describe a free radical as a species with one or more unpaired electrons

Answer:

Knowledge points:

Solution:

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