Question 1

31.0 grams of the element phosphorus contain:

Accepted Answer

A) 6.02 × 1023 P4 molecules 
B) 31.0 × (6.02 × 1023)P atoms 
C) 6.02 × 1023 P atoms 
D) 31.0 P atoms 
E) 31.0 moles of P 
A) 6.02 × 1023 P4 molecules 
B) 31.0 × (6.02 × 1023)P atoms 
C) 6.02 × 1023 P atoms 
D) 31.0 P atoms 
E) 31.0 moles of P

Question 2

Which of the following represent isotopes?
A:  X 
B:  X 
C:  X 
D:  X

Accepted Answer

A) A and B 
B) A and C 
C) A and D 
D) C and D 
A) A and B 
B) A and C 
C) A and D 
D) C and D

Question 3

What is the mass of a sample containing 1.2 moles of Ni?

Accepted Answer

A) 49 g 
B) 59 g 
C) 34 g 
D) 61 g 
E) 70 g 
A) 49 g 
B) 59 g 
C) 34 g 
D) 61 g 
E) 70 g

Question 4

How many atoms of rubidium-85 are in 87.2 g of rubidium? Rubidium-85 is 72.2 % abundant.

Accepted Answer

A) 5.16 × 1046 atoms 
B) 4.46 × 1023 atoms 
C) 8.51 × 1023 atoms 
D) 6.14 × 1022 atoms 
E) 1.02 × 1024 atoms 
A) 5.16 × 1046 atoms 
B) 4.46 × 1023 atoms 
C) 8.51 × 1023 atoms 
D) 6.14 × 1022 atoms 
E) 1.02 × 1024 atoms

Question 5

How many protons (p)and neutrons (n)are in an atom of   Sr?

Accepted Answer

A) 38 p,52 n 
B) 38 p,90 n 
C) 52 p,38 n 
D) 90 p,38 n 
A) 38 p,52 n 
B) 38 p,90 n 
C) 52 p,38 n 
D) 90 p,38 n

Question 6

Identify the chemical symbol of element Q in  Q.

Accepted Answer

A) Br 
B) Hg 
C) Pd 
D) Se 
A) Br 
B) Hg 
C) Pd 
D) Se

Question 7

Write the symbol for the radioactive isotope phosphorus-32.

Accepted Answer

A)    P 
B)    Ge 
C)    P 
D)    P 
E)    Ge 
A)    P 
B)    Ge 
C)    P 
D)    P 
E)    Ge

Question 8

Cesium belongs to the ________ group of the periodic table.

Accepted Answer

A) alkali metal 
B) alkaline earth metal 
C) halogen 
D) noble gas 
A) alkali metal 
B) alkaline earth metal 
C) halogen 
D) noble gas

Question 9

Choose the information a mass spectrometer is unable to provide.

Accepted Answer

A) the relative abundance of two isotopes of potassium 
B) the number of protons in potassium 
C) the atomic mass of a single isotope of potassium 
D) the mass of a proton 
E) the number of stable isotopes of potassium 
A) the relative abundance of two isotopes of potassium 
B) the number of protons in potassium 
C) the atomic mass of a single isotope of potassium 
D) the mass of a proton 
E) the number of stable isotopes of potassium

Question 10

What is the atomic weight of an element if 4.00 grams of it contain  
Atoms?

Accepted Answer

A) 20.2 u 
B) 80.8 u 
C) 19.7 u 
D) 8.08 u 
E) 2.02 u 
A) 20.2 u 
B) 80.8 u 
C) 19.7 u 
D) 8.08 u 
E) 2.02 u

Question 11

An element has 5 stable isotopes.The mass and percentage of each are:
 
The element is which of the following?

Accepted Answer

A) As 
B) Se 
C) Ge 
D) Ga 
E) Zn 
A) As 
B) Se 
C) Ge 
D) Ga 
E) Zn

Question 12

All atoms of a given element are identical.

Accepted Answer

A) True 
 B)False

Question 13

Lead has 4 stable isotopes with masses of 203.973 (1.48%),205.9745 (23.6%),206.9759,and 207.9766 respectively.What are the percentages of the last two isotopes?

Accepted Answer

A) 77% and 23% 
B) 50% and 50% 
C) 37% and 38% 
D) 64% and 11% 
E) 24% and 50% 
A) 77% and 23% 
B) 50% and 50% 
C) 37% and 38% 
D) 64% and 11% 
E) 24% and 50%

Question 14

What is the isotopic atomic mass of an isotope if 9.7023 × 1022 atoms weighs 4.0256 g?

Accepted Answer

A) 0.64858 g 
B) 24.305 g 
C) 24.986 g 
D) 13.728 g 
E) 4.0256 g 
A) 0.64858 g 
B) 24.305 g 
C) 24.986 g 
D) 13.728 g 
E) 4.0256 g

Question 15

J.J.Thomson suggested the "plum pudding" model of the atom.

Accepted Answer

A) True 
 B)False

Question 16

The total numbers of neutrons,protons,and electrons in 35Cl- are ________.

Accepted Answer

A) 17 neutrons,35 protons,36 electrons 
B) 35 neutrons,17 protons,18 electrons 
C) 18 neutrons,17 protons,16 electrons 
D) 18 neutrons,17 protons,18 electrons 
E) 17 neutrons,17 protons,17 electrons 
A) 17 neutrons,35 protons,36 electrons 
B) 35 neutrons,17 protons,18 electrons 
C) 18 neutrons,17 protons,16 electrons 
D) 18 neutrons,17 protons,18 electrons 
E) 17 neutrons,17 protons,17 electrons

Question 17

A certain mass of nickel reacts with sulphur to produce 2.83 g of NiS.The same mass of nickel reacts completely with 0.5 g of oxygen to produce 2.33 g of NiO.How many grams of sulfur reacted in the first reaction?

Accepted Answer

A) 0.5 g 
B) 1 g 
C) 1.5 g 
D) 10-1 g 
E) 1.25 g 
A) 0.5 g 
B) 1 g 
C) 1.5 g 
D) 10-1 g 
E) 1.25 g

Question 18

The natural abundance of calcium in the earth's crust is 3.4% by mass.How many calcium atoms are present in a 1.50 g sample of the earth's crust?

Accepted Answer

A) 6.6 × 1023 atoms 
B) 3.1 × 1022 atoms 
C) 7.7 × 1020 atoms 
D) 7.7 × 1022 atoms 
E) 5.1 × 1020 atoms 
A) 6.6 × 1023 atoms 
B) 3.1 × 1022 atoms 
C) 7.7 × 1020 atoms 
D) 7.7 × 1022 atoms 
E) 5.1 × 1020 atoms

Question 19

A solution contains 12.5% NaCl by mass.What mass of solution is required to obtain   Na atoms?

Accepted Answer

A) 0.013 g 
B) 30 g 
C) 1.2 g 
D) 95 g 
E) 78 g 
A) 0.013 g 
B) 30 g 
C) 1.2 g 
D) 95 g 
E) 78 g

Question 20

Isotopes have different atomic number (Z)but the same mass number (A).

Accepted Answer

A) True 
 B)False

Exam 2: Atoms and the Atomic Theory

31.0 grams of the element phosphorus contain:

Which of the following represent isotopes? A: X B: X C: X D: X

What is the mass of a sample containing 1.2 moles of Ni?

How many atoms of rubidium-85 are in 87.2 g of rubidium? Rubidium-85 is 72.2 % abundant.

How many protons (p)and neutrons (n)are in an atom of Sr?

Identify the chemical symbol of element Q in Q.

Write the symbol for the radioactive isotope phosphorus-32.

Cesium belongs to the ________ group of the periodic table.

Choose the information a mass spectrometer is unable to provide.

What is the atomic weight of an element if 4.00 grams of it contain Atoms?

An element has 5 stable isotopes.The mass and percentage of each are: The element is which of the following?

All atoms of a given element are identical.

Lead has 4 stable isotopes with masses of 203.973 (1.48%),205.9745 (23.6%),206.9759,and 207.9766 respectively.What are the percentages of the last two isotopes?

What is the isotopic atomic mass of an isotope if 9.7023 × 1022 atoms weighs 4.0256 g?

J.J.Thomson suggested the "plum pudding" model of the atom.

The total numbers of neutrons,protons,and electrons in 35Cl- are ________.

A certain mass of nickel reacts with sulphur to produce 2.83 g of NiS.The same mass of nickel reacts completely with 0.5 g of oxygen to produce 2.33 g of NiO.How many grams of sulfur reacted in the first reaction?

The natural abundance of calcium in the earth's crust is 3.4% by mass.How many calcium atoms are present in a 1.50 g sample of the earth's crust?

A solution contains 12.5% NaCl by mass.What mass of solution is required to obtain Na atoms?

Isotopes have different atomic number (Z)but the same mass number (A).

Matter: Its Properties and Measurement

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the isotopic atomic mass of an isotope if 9.7023 × 10²² atoms weighs 4.0256 g?

The total numbers of neutrons,protons,and electrons in ³⁵Cl^- are ________.