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) 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 9) What is graphene? a) Graphite spelt wrong b) A nitrogen compound c) A single layer of graphite d) A hydrocarbon 10) 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 11) Which is the correct way to describe the electrons in a covalent bond? a) Transferred b) Borrowed c) Shared 12) Is water a molecule? a) Yes b) No 13) Is glucose a molecule? a) Yes b) No 14) Which of these is an example of a giant covalent compound? a) Fullerene b) Diamond c) Sodium chrloride d) Glucose 15) What charge do electrons have? a) Postive b) Negative c) Neutral 16) How many electrons in a double bond? a) 2 b) 4 c) 6 17) Covalent bonding happens between: a) Metals only b) Non-metals only c) Metals and non-metals 18) What is the odd one out a) Water b) Glucose c) Methane d) Diamond

Covalent bonding

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