Reaction of Zinc and Sulfur

Click on the correct answer.


1	A covalent compound
		is one which involves two metals
		is one in which there is a metal with a non-metal
		is one in which there are two non-metals together in the compound



2	Zinc sulfide (ZnS) is an example of
		a covalent compound
		an ionic compound
		neither covalent nor ionic compound



3	When zinc combines with sulfur to form zinc sulfide,
		zinc loses electrons
		sulfur loses electrons
		zinc gains electrons
		sulfur gains electrons
		zinc is oxidized

4	Which products were formed in this demonstration?
		zinc
		sulfur
		zinc sulfide
		zinc oxide
		sulfur dioxide

5	On the energy of activation curve the energy of activation
		is the energy difference between the products and the reactants
		is the energy difference between the products and the highest point of the curve
		is the energy difference between the reactants and the highest point of the curve
		is none of the above


6	The function of touching a hot rod to the reactants was
		to make the sulfur melt
		to keep the reaction going
		to provide energy of activation to the reactants
		to convert heat energy to light energy


7	Which is (are) true in the chemical reaction in this demonstration?
		zinc combined with oxygen from the air
		the cloud contained only zinc oxide and other ionic compounds
		sulfur combined with oxygen from the air
		zinc combined with nitrogen from the air
		both heat and light energy were liberated in the reaction

8	The prefix "di" in the name of the compound 'sulfur dioxide' refers to
		the 2+ oxidation number of oxygen
		the fact that there are two atoms of oxygen in one molecule of sulfur dioxide
		the 2+ oxidation number of sulfur
		the fact that there are two different elements present in the compound sulfur dioxide
		it has no specific meaning

9	What is the oxidation number of zinc in zinc oxide and in zinc sulfide?
		negative
		positive
		1+
		2+
		3+

10	Which of the following is (are) correct in this demonstration
		the reaction of zinc with sulfur formed an ionic compound
		the reaction of zinc with oxygen formed an ionic compound
		the reaction of sulfur with oxygen formed a covalent compound
		zinc was oxidized in all the reactions
		all the reactions were redox reactions except for one