REGULAR QUIZZES - REGULAR TOPIC 7 Stoichiometry SET D • REGULAR Quizzes - REGULAR TOPIC 7 Stoichiometry SET D.

QUESTION 1. When attempting to determine the formula of a hydrated salt, what is meant by "Heating to a constant mass"?

(A) Heating a specific number of times
(B) Heating until the compound decomposes into its elements
(C) Heating until half of the water has been removed
(D) Heating for the same amount of time on each heating/cooling/re-weighing cycle
(E) None of the Above

QUESTION 2. What is the empirical formula of a compound that is 5.88% hydrogen, the remainder being oxygen?

(A) H5O
(B) H5O2
(C) H2O2
(D) H2O
(E) HO

QUESTION 3. The compound in question #2 above, has a molar mass of 34 gmol-1, what is its molecular formula?

(A) HO
(B) OH
(C) H2O2
(D) H5O
(E) H3O3

QUESTION 4. When a chemical equation is written AND balanced with the lowest possible integers for the following chemical reaction, what coefficient appears in front of methane?

Methane (CH4) combusts in oxygen to produce carbon dioxide and water?

(A) 1
(B) 2
(C) 3
(D) 4
(E) None of the Above

QUESTION 5. When the following chemical equation is balanced using the lowest possible integers, what is the total of the sum of the coefficients?

Fe2(SO4)3 + BaCl2 ==> FeCl3 + BaSO4?

(A) 7
(B) 8
(C) 10
(D) 12
(E) 9 