Answer:

11. B

12. A

13.C

11. Compounds is composed of one atom(I). Elements is a single atom substance(II).

A Both statements I and II are TRUE.

B. Both statements I and II are FALSE.

C. Statement Iis FALSE while statement II is TRUE. D. Statement lis TRUE while statement II is FALSE.

12. Airon Jay is fond of eating cereal drink even if he is already in grade 7. What compounds do Airon Jay has taken?

l. Iron pyrophosphate

II. Calcium chloride

III. Sodium bicarbonate

IV. Zinc sulfate

A. I and II only

B. I and III only

C. II and III only

D. I and IV only

13. Danica was assigned by her teacher to match compound with its constituent elements. Which do you think of her matched pair are correct?

I. Calcium chloride : calcium, chlorine

II. Water : nitrogen, oxygen

III. Carbon dioxide; carbon, oxygen

IV. Salt: sodium, magnesium

A. I and II only

B. I and III only

C. II and III only

D. I and IV only