1) How many H atoms does N bond with? a) 1 b) 2 c) 3 d) 4 2) How many H atoms does C bond with? a) 1 b) 2 c) 3 d) 4 3) The formula for ammonia is a) H2 b) H2O c) NH3 d) CH4 4) The formula for methane is a) H2 b) H2O c) NH3 d) CH4 5) Which is an element? a) H2 b) H2O c) NH3 d) CH4 6) Which substance burns? a) H2O b) NH3 c) CH4 7) Which is a compound? a) H2 b) O2 c) O3  d) N2 e) H2O 8) Which molecule would be best to make a perfume? a) hydrogen sulfide b) methanethiol c) butanethiol d) methyl benzoate

10th Video A

от
Печат
За вграждане

Табло

Визуален стил

Опции

Шаблон за превключване

Възстановяване на авто-записаната: ?