1) What is the number of bonds that an atom can make with other atoms called? a) valency b) strength c) bond length d) atomicnumber 2) What is the formula for the molecule formed between two hydrogen atoms and two oxygen atoms. (See 1min 30s) a) H2O b) H2O2 c) HO2 d) HO 3) The bond holding an O2 molecule together is a a) single bond b) double bond c) triple bond d) quadruple bond 4) The bond holding an N2 molecule together is a a) single bond b) double bond c) triple bond d) quadruple bond 5) About what percentage (%) of the air is oxygen, O2? a) 0 b) 20 c) 40 d) 60 e) 80 f) 100 6) About what percentage (%) of the air is nitrogen, N2? a) 0 b) 20 c) 40 d) 60 e) 80 f) 100 7) The formula for an oxygen molecule is a) Ox b) Oxygen c) O d) O2 8) The formula for an nitrogen molecule is a) Ni b) N3 c) Nitrogen d) N e) N2 9) The ratio of nitrogen to oxygen (N:O) in the air is about a) 1:1 b) 50:50 c) 20:80 d) 80:20

12th Video A

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