1) Which of these is a simple covalent molecule? a) Cl2 b) H2O c) NaCl d) CaCO3 e) KCl f) Na2SO4 2) A covalent bond shares electrons a) True b) False 3) Covalent bonds occur between metals and non-metals a) True b) False 4) Which of these is a property of simple covalent molecules? a) High MP b) Low MP c) Low BP d) Can conduct electricity 5) How many electrons are there in a single covalent bond? a) 2 b) 4 c) 6 6) Figure 1 shows the structure of an element. What is the name of the element? a) Carbon b) Chloride c) Nitrogen d) Xenon 7) Why can graphite and graphene conduct electricity? a) They have delocalised electrons b) They contain hexagonal rings c) They have weak forces between the layers d) They have ionic bonds 8) Methanes boiling point is -162°C, water's is 100°C, which statement explains the data in the table? a) Methane has a lower boiling point than water b) The intermolecular forces between the molecules in methane are weaker than the intermolecular forces between the molecules in water c) The covalent bonds between the atoms in a water molecule are stronger than the covalent bonds between the atoms in a methane molecule d) The covalent bonds between the atoms in a water molecule are weaker than the covalent bonds between the atoms in a methane molecule 9) Why does diamond have a high melting point? a) Many strong covalent bonds b) High intermolecular forces c) High electrostatic forces d) Because it does 10) What is graphene? a) Graphite spelt wrong b) A nitrogen compound c) A single layer of graphite d) A hydrocarbon 11) What is the correct definition of molecule? a) A small number of atoms joined by ionic bonds b) A small number of atoms joined by covalent bonds c) A small number of atoms joined by metallic bonds 12) Why do simple covalent molecules have low melting and boiling points? a) Strong covalent bonds b) Weak covalent bonds c) Weak intermolecular forces d) Weak intermolecular bonds 13) Which is the correct way to describe the electrons in a covalent bond? a) Transferred b) Borrowed c) Shared 14) Is water a molecule? a) Yes b) No 15) Is glucose a molecule? a) Yes b) No 16) Which of these is an example of a giant covalent compound? a) Fullerene b) Diamond c) Sodium chrloride d) Glucose 17) What charge do electrons have? a) Postive b) Negative c) Neutral 18) How many electrons in a double bond? a) 2 b) 4 c) 6 19) Covalent bonding happens between: a) Metals only b) Non-metals only c) Metals and non-metals 20) What is the odd one out a) Water b) Glucose c) Methane d) Diamond

Covalent bonding

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