Question 1

Which of the following is an example of the law of multiple proportions?

Accepted Answer

A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37. 
B) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O:1 g C and 2.66 g O:1 g C. 
C) Two different samples of table salt are found to have the same ratio of sodium to chlorine. 
D) The atomic mass of bromine is found to be 79.90 amu. 
E) Nitrogen dioxide always has a mass ratio of 2.28 g O:1 g N. 
A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37. 
B) Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O:1 g C and 2.66 g O:1 g C. 
C) Two different samples of table salt are found to have the same ratio of sodium to chlorine. 
D) The atomic mass of bromine is found to be 79.90 amu. 
E) Nitrogen dioxide always has a mass ratio of 2.28 g O:1 g N.

Question 2

Which of the following statements about isotopes is TRUE?

Accepted Answer

A) Isotopes of the same element differ only in the number of electrons they contain. 
B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. 
C) Isotopes of the same element have the same mass. 
D) Isotopes of the same element don't usually have the same properties. 
E) Some elements have three or more naturally occurring isotopes. 
A) Isotopes of the same element differ only in the number of electrons they contain. 
B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. 
C) Isotopes of the same element have the same mass. 
D) Isotopes of the same element don't usually have the same properties. 
E) Some elements have three or more naturally occurring isotopes.

Question 3

What mass (in kg)does 5.84 moles of titanium (Ti)have?

Accepted Answer

A) 0.352 kg 
B) 0.122 kg 
C) 0.820 kg 
D) 0.280 kg 
E) 0.632 kg 
A) 0.352 kg 
B) 0.122 kg 
C) 0.820 kg 
D) 0.280 kg 
E) 0.632 kg

Question 4

How many moles of Kr are contained in 398 mg of Kr?

Accepted Answer

A) 4.75 × 10-3 moles Kr 
B) 33.4 moles Kr 
C) 2.11 × 10-4 moles Kr 
D) 2.99 × 10-3 moles Kr 
E) 1.19 × 10-4 moles Kr 
A) 4.75 × 10-3 moles Kr 
B) 33.4 moles Kr 
C) 2.11 × 10-4 moles Kr 
D) 2.99 × 10-3 moles Kr 
E) 1.19 × 10-4 moles Kr

Question 5

What group of elements in the periodic table are the most unreactive and why?

Accepted Answer

The noble gases are the most u

Question 6

How many phosphorus atoms are contained in 158 kg of phosphorus?

Accepted Answer

A) 3.07 × 1027 phosphorus atoms 
B) 2.95 × 1027 phosphorus atoms 
C) 3.25 × 1028 phosphorus atoms 
D) 1.18 × 1024 phosphorus atoms 
E) 8.47 × 1024 phosphorus atoms 
A) 3.07 × 1027 phosphorus atoms 
B) 2.95 × 1027 phosphorus atoms 
C) 3.25 × 1028 phosphorus atoms 
D) 1.18 × 1024 phosphorus atoms 
E) 8.47 × 1024 phosphorus atoms

Question 7

What species is represented by the following information? 
p+ = 47 n° = 62 e- = 46

Accepted Answer

A) Ag+ 
B) Nd 
C) Pd 
D) Ag 
E) Pd+ 
A) Ag+ 
B) Nd 
C) Pd 
D) Ag 
E) Pd+

Question 8

Bromine has two naturally occurring isotopes,Br-79 and Br-81.The atomic mass of Br-79 is 78.9183 u with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 u.Calculate the atomic mass of bromine.

Accepted Answer

A) 80.91 u 
B) 78.92 u 
C) 79.90 u 
D) 80.92 u 
E) 80.03 u 
A) 80.91 u 
B) 78.92 u 
C) 79.90 u 
D) 80.92 u 
E) 80.03 u

Question 9

Which one of the following elements is a poor conductor of heat and electricity?

Accepted Answer

A) copper 
B) fluorine 
C) iron 
D) lead 
A) copper 
B) fluorine 
C) iron 
D) lead

Question 10

Gallium has an atomic mass of 69.723 u.The abundance of Ga-69 (68.926 u)is 60.11%.What is the atomic mass,in u,of the other isotope?

Accepted Answer

A) 70.92 u 
B) 70.93 u 
C) 70.94 u 
D) 70.91 u 
E) 70.930 u 
A) 70.92 u 
B) 70.93 u 
C) 70.94 u 
D) 70.91 u 
E) 70.930 u

Question 11

In which of the following sets do all species have the same number of protons?

Accepted Answer

A) Br-,Kr,Sr2+ 
B) C,N3-,O2- 
C) Mg2+,Sr2+,Ba2+ 
D) O,O2-,O2+ 
A) Br-,Kr,Sr2+ 
B) C,N3-,O2- 
C) Mg2+,Sr2+,Ba2+ 
D) O,O2-,O2+

Question 12

Predict the charge that an aluminum ion would have.

Accepted Answer

A) 5- 
B) 1+ 
C) 1- 
D) 2+ 
E) 3+ 
A) 5- 
B) 1+ 
C) 1- 
D) 2+ 
E) 3+

Question 13

Which element has the chemical symbol S?

Accepted Answer

A) selenium 
B) silicon 
C) sulfur 
D) scandium 
A) selenium 
B) silicon 
C) sulfur 
D) scandium

Question 14

What is the chemical symbol for copper?

Accepted Answer

A) Co 
B) Cr 
C) Cu 
D) C 
A) Co 
B) Cr 
C) Cu 
D) C

Question 15

Which element has the chemical symbol Ru?

Accepted Answer

A) rubidium 
B) ruthenium 
C) rutherfordium 
D) rhodium 
A) rubidium 
B) ruthenium 
C) rutherfordium 
D) rhodium

Question 16

Which of the following statements is TRUE?

Accepted Answer

A) Cations are usually larger than their corresponding atom. 
B) Metals tend to form cations. 
C) Atoms are usually larger than their corresponding anion. 
D) The halogens tend to form 1+ ions. 
E) Nonmetals tend to lose electrons. 
A) Cations are usually larger than their corresponding atom. 
B) Metals tend to form cations. 
C) Atoms are usually larger than their corresponding anion. 
D) The halogens tend to form 1+ ions. 
E) Nonmetals tend to lose electrons.

Question 17

Determine the number of protons,neutrons,and electrons in the following: $${ } _ { 18 } ^ { 40 } \mathrm { X }$$

Accepted Answer

A) p+ = 18 n° = 18 e- = 22 
B) p+ = 18 n° = 22 e- = 18 
C) p+ = 22 n° = 18 e- = 18 
D) p+ = 18 n° = 22 e- = 40 
E) p+ = 40 n° = 22 e- = 18 
A) p+ = 18 n° = 18 e- = 22 
B) p+ = 18 n° = 22 e- = 18 
C) p+ = 22 n° = 18 e- = 18 
D) p+ = 18 n° = 22 e- = 40 
E) p+ = 40 n° = 22 e- = 18

Question 18

Calculate the mass (in ng)of 2.33 × 1020 atoms of oxygen.

Accepted Answer

A) 6.19 × 106 ng 
B) 1.62 × 107 ng 
C) 2.25 × 103 ng 
D) 3.73 × 106 ng 
E) 4.69 × 107 ng 
A) 6.19 × 106 ng 
B) 1.62 × 107 ng 
C) 2.25 × 103 ng 
D) 3.73 × 106 ng 
E) 4.69 × 107 ng

Question 19

How many atoms are in 2.50 moles of CO2?

Accepted Answer

A) 4.52 × 1024 atoms 
B) 1.52 × 1024 atoms 
C) 5.02 × 1023 atoms 
D) 3.01 × 1024 atoms 
E) 7.53 × 1023 atoms 
A) 4.52 × 1024 atoms 
B) 1.52 × 1024 atoms 
C) 5.02 × 1023 atoms 
D) 3.01 × 1024 atoms 
E) 7.53 × 1023 atoms

Question 20

If 26.0 g of water, $\mathrm { H } _ { 2 }$ O,is found to contain 2.9 g of hydrogen and 23.1 g of oxygen,how much hydrogen and oxygen,in grams,is contained in 32.0 g of water?

Accepted Answer

A) 3.6 g hydrogen and 28.4 g oxygen 
B) 28.4 g hydrogen and 3.6 g oxygen 
C) 26.0 g hydrogen and 28.4 g oxygen 
D) 3.6 g hydrogen and 2.9 g oxygen 
E) 2.9 g hydrogen and 28.4 g oxygen 
A) 3.6 g hydrogen and 28.4 g oxygen 
B) 28.4 g hydrogen and 3.6 g oxygen 
C) 26.0 g hydrogen and 28.4 g oxygen 
D) 3.6 g hydrogen and 2.9 g oxygen 
E) 2.9 g hydrogen and 28.4 g oxygen

Exam 2: Atoms and Elements

Which of the following is an example of the law of multiple proportions?

Which of the following statements about isotopes is TRUE?

What mass (in kg)does 5.84 moles of titanium (Ti)have?

How many moles of Kr are contained in 398 mg of Kr?

What group of elements in the periodic table are the most unreactive and why?

How many phosphorus atoms are contained in 158 kg of phosphorus?

What species is represented by the following information? p+ = 47 n° = 62 e- = 46

Bromine has two naturally occurring isotopes,Br-79 and Br-81.The atomic mass of Br-79 is 78.9183 u with a percent abundance of 50.69% and the atomic mass of Br-81 is 80.9163 u.Calculate the atomic mass of bromine.

Which one of the following elements is a poor conductor of heat and electricity?

Gallium has an atomic mass of 69.723 u.The abundance of Ga-69 (68.926 u)is 60.11%.What is the atomic mass,in u,of the other isotope?

In which of the following sets do all species have the same number of protons?

Predict the charge that an aluminum ion would have.

Which element has the chemical symbol S?

What is the chemical symbol for copper?

Which element has the chemical symbol Ru?

Which of the following statements is TRUE?

Determine the number of protons,neutrons,and electrons in the following: 1840X{ } _ { 18 } ^ { 40 } \mathrm { X }1840​X

Calculate the mass (in ng)of 2.33 × 1020 atoms of oxygen.

How many atoms are in 2.50 moles of CO2?

If 26.0 g of water, H2\mathrm { H } _ { 2 }H2​ O,is found to contain 2.9 g of hydrogen and 23.1 g of oxygen,how much hydrogen and oxygen,in grams,is contained in 32.0 g of water?

Units of Measurement for Physical and Chemical Change

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

What species is represented by the following information? p⁺ = 47 n° = 62 e^- = 46

Determine the number of protons,neutrons,and electrons in the following: ${ } _ { 18 } ^ { 40 } \mathrm { X }$

Calculate the mass (in ng)of 2.33 × 10²⁰atoms of oxygen.

How many atoms are in 2.50 moles of CO₂?

If 26.0 g of water, $\mathrm { H } _ { 2 }$ O,is found to contain 2.9 g of hydrogen and 23.1 g of oxygen,how much hydrogen and oxygen,in grams,is contained in 32.0 g of water?