Semester 1 Exam Review

Question 1

Which pair have approximately the same mass?

Answer 1

a proton and a neutron

Question 2

Which of the following is a noble gas?

Answer 2

Ar

Question 3

The measurement g also could be written as

Answer 3

8.0 kg

Question 4

An aqueous solution of HF would be named

Answer 4

Hydroflouric Acid

Question 5

Chemical Properties of Gold

Answer 5

Gold is an inert (nonreactive) metal.

Question 6

The atom with 68 neutrons and 50 protons has a mass number of

Answer 6

50

Question 7

A 12.7 sample of CaCO3 was treated with aqueous H2SO4, producing calcium sulfate, water and 3.65 g of CO2(g). What was the % yield of CO2?
a. 71.3 b. 5.6
c. 34.7 d. 65.3

Answer 7

D 65.3%

Question 8

An atom with 15 protons and 16 neutrons is an atom of

Answer 8

P (Phosphorus)

Question 9

The correct formula for ammonium sulfate is

Answer 9

(NH4)2SO4

Question 10

How many protons are in the nucleus of a Mg atom?

Answer 10

12

Question 11

Which of the following is the correct formula for bromic acid?

Answer 11

HBrO3(aq)

Question 12

Which of the following involves no chemical change?

Answer 12

boiling water

Question 13

What is the formula for potassium carbonate?

Answer 13

K2CO3

Question 14

The correct name for FeO is

Answer 14

iron(II) oxide

Question 15

Which of the following elements is an alkali metal?

Answer 15

Rb

Question 16

How many moles of oxygen are required to react completely with 5.96 mol of sugar?

Answer 16

71.5

Question 17

The correct name for an aqueous solution of HC2H3O2 is

Answer 17

acetic acid

Question 18

A 1.07-mole sample of H2O2 weighs

Answer 18

36.4

Question 19

A 46.2-mol sample of Co represents how many atoms?

Answer 19

2.78 × 1025 atoms

Question 20

The substance ClO3– is best described as

Answer 20

a polyatomic ion

Question 21

Calculate the mass, in grams, of 9.81 × 1026 formula units of sulfur dioxide.
a. none of these

Answer 21

1.04 × 105 g

Question 22

Consider the equation: . The molar mass of B is 50.0 g/mol. Which of the following statements is true when equal masses of A and B are reacted?

Answer 22

If the molar mass of A is less than the molar mass of B, then B must determine how much C is produced.

Question 23

Which of these is a chemical property?

Answer 23

Helium is very nonreactive.

Question 24

Which of the following conversion factors is incorrect?

Answer 24

1 cm/2.54 in