1) Atoms bond to half complete their outer shell a) True b) False 2) Covalent bonding occurs between metals and non-metals. a) True b) False 3) Covalent bond is a shared pair of electrons a) True b) False 4) An oxygen molecule contains a double bond  a) True b) False 5) Sodium Chloride contains covalent bonds a) True b) False 6) Covalent bonds only occur in compounds a) True b) False 7) Non-metals rarely form covalent bonds a) True b) False 8) How many electrons are there in a single covalent bond? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 9) 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 10) Which is the correct way to describe the electrons in a covalent bond? a) transferred b) borrowed c) shared 11) Is water a molecular substance? a) Yes b) No 12) How many electrons are there in a double bond? a) 2 b) 4 c) 6 d) 8 13) Which is the odd one out? a) water, H2O b) hydrogen chloride, HCl c) sodium chloride, NaCl d) oxygen, O2 14) Which of these is a simple covalent molecule? a) Cl2 b) H2O c) NaCl d) CaCO3 e) KCl f) Na2SO4 15) Molecules of which substance have a double bond? a) chlorine b) hydrogen c) nitrogen d) oxygen 16) Nitrogen is in Group 5. How many covalent bonds are there in a molecule of nitrogen, N2? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 17) In a stick diagram, each stick represents: a) one shared electron b) one shared electron pair c) one lone electron d) one lone electron pair 18) Which molecules have double covalent bonds? a) chlorine, Cl2 b) oxygen, O2 c) hydrogen, H2 d) water, H2O e) methane, CH4 f) carbon dioxide, CO2 19) How many covalent bonds are there in a molecule of ammonia (a model is shown in the picture)? a) 1 b) 2 c) 3 d) 4 20) In a molecule of water, there are (choose the best answer): a) 2 single covalent bonds b) 4 covalent bonds c) 8 covalent bonds d) 2 double covalent bonds and 2 lone electron pairs e) 2 single covalent bonds and 2 lone electron pairs

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