Table 9.

Improvement of scores of questions on chemical reaction between acid and metal

	Number of correct answers pre-test/post-test (gain)
	Group C	Group E
Q-A) Describe the reaction formula when Ca and H2SO4 react.	2/2 (+0)	2/2 (+0)
Q-B) Describe the reaction formula when Cu and H2SO4 react.	0/0 (+0)	0/3 (+3)
Q-C) In general, how do acids and metals react?	0/0 (+0)	0/2 (+2)
Q-D) Do the following combinations of materials cause chemical reactions?
(a) Na and H2SO4	3/4 (+1)	4/4 (+0)
(b) Cu and HCl	1/1 (+0)	1/2 (+1)
Q-E) Do the following combinations of materials cause the production of H2 gas?
(a) Pb and HCl	2/3 (+1)	3/4 (+1)
(b) Ag and H2SO4	1/3 (+2)	0/2 (+2)