Name_______________________
1
1. For each of the following questions write the letter corresponding to the best answer in the space
provided.
Each atom of the most common isotope of cesium metal contains:
a. 55 protons, 55 neutrons, and 139 electrons
b. 55 protons, 139 neutrons, and 55 electrons
c. 84 protons, 55 neutrons, and 84 electrons answer:_______
d. 55 protons, 84 neutrons, and 55 electrons
e. 139 protons, 55 neutrons, and 139 electrons
A solid with an irregular shape and a mass of 11.33 g is added to a graduated cylinder filled with
water (d = 1.00 g/mL) to the 35.0-mL mark. After the solid sinks to the bottom, the water level is read
to be at the 42.3-mL mark. What is the density of the solid?
a. 0.644 g/mL
b. 1.6 g/mL
c. 0.268 g/mL answer:_______
d. 1.55 g/mL
e. 0.64 g/mL
An amount equal to 3.00 mol of H2(
g
) reacts with 2.00 mol of O2(
g
). If 30.0 g of H2O(l) (the only
product) are collected, what is the percent yield of the reaction?
a. 27.7%
b. 31.7%
c. 41.6% answer:_______
d. 55.5%
e. 83.2%
Which compound is named correctly?
a. FeS2, iron(IV) sulfide
b. Mg(NO3)2, magnesium nitrite
c. SF4, sulfur(I V) fluoride answer:_______
d. HClO3, hydrochloric acid
e. Ti(SO4)3, titanium(III) sulfate
What is the mass percent of aluminum in Al2(OH)5Cl (MM = 174.45 g/mol)?
a. 20.3%
b. 15.4%
c. 30.9% answer:_______
d. 7.69%
e. not enough information given to solve this problem
Which compound(s) contain the most nitrogen atoms per molecule or formula unit?
a. sodium nitrate
b. ammonium sulfate
c. calcium nitrate answer:_______
d. ammonium phosphate
e. ammonium nitrate
