Total Mark: ______/20
Total Mark: ______/20
Covalent Bonding & Molecule properties (H) Questions
Q1. The table shows some properties of six compounds.
compound | melting point / °C | boiling point / °C | solubility in water | electrical conductivity of solution | copper sulfate | 200 | decomposes | soluble | high | hexane | –95 | 69 | insoluble | does not dissolve | hydrogen chloride | –112 | –85 | soluble | high | octane | –57 | 126 | insoluble | does not dissolve | silicon(IV) oxide | 1610 | 2230 | insoluble | does not dissolve | sodium chloride | 801 | 1413 | soluble | high |
Draw a dot and cross diagram of a molecule of hydrogen chloride. Show outer electrons only.
(2)
Q2. Nitrogen and oxygen are present in the air. Another gas present in air is carbon dioxide, CO2. There are covalent bonds between the atoms in a molecule of carbon dioxide.
(i) Describe what is meant by a covalent bond.
(2)
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(ii) The electronic configuration of oxygen (atomic number 8) is 2.6.
Give the electronic configuration of carbon (atomic number 6).
(1)
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(iii) Draw a dot and cross diagram of a molecule of carbon dioxide.
Show outer electrons only.
(2)
