1) How many times will a H atom bond with another H atom? a) 1 b) 2 c) 3 d) 4 2) Which molecules are formed when lots of H atoms collide? a) H b) H2 c) H3 d) 2H 3) A hydrogen-filled balloon contains trillions of trillions of a) H atoms b) H2 molecules c) H3 molecules 4) H2 is hydrogen's a) molecular formula b) structural formula 5) H-H is hydrogen's a) molecular formula b) structural formula 6) The formula for a hydrogen molecule is a) H2 b) H2 c) H2 d) 2H 7) Which is INCORRECT a) When a H atom hits an O atom they stick together b) When a second H atom hits it also sticks. c) When a third H atom hits it also sticks. 8) The formula for water is a) H1O2 b) HO2 c) H2O1 d) H2O 9) Which substance is a compound? a) H2 b) H2O 10) Which substance is an element? a) H2 b) H2O

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