13. Calcium chloride is a compound of two elements,
calcium and chlorine. Which of the following
statements are true?
A. Calcium chloride is listed in the periodic table.
B. The symbol for calcium chloride includes Ca and CI.
C. Chlorine may still be broken down into a simpler
form.
D. Calcium and chlorine belong to the same group in
the periodic table.

14. Which set of substances are noble gases?
A. Helium and Neon
B. Hydrogen and Helium
C. Nitrogen and Silicon
D. Silver and Gold

15. Which is a compound used at home in cleaning
household wares?
A. baking soda
B. brown sugar
C. ethyl alcohol
D. soy sauce​