Question 1

If 3.6 g of chlorine combines with sodium to make 6.0 g of sodium chloride, what mass of sodium is required?

Accepted Answer

A) 3.6 g 
B) 2.4 g 
C) 6.0 g 
D) 9.6 g 
E) 1.2 g 
A) 3.6 g 
B) 2.4 g 
C) 6.0 g 
D) 9.6 g 
E) 1.2 g

Question 2

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 amu. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 amu.

Accepted Answer

A) 13.1 amu 
B) 13.0 amu 
C) 12.0 amu 
D) 12.8 amu 
E) 12.4 amu 
A) 13.1 amu 
B) 13.0 amu 
C) 12.0 amu 
D) 12.8 amu 
E) 12.4 amu

Question 3

Calculate the atomic mass of tungsten given the atomic mass and percent abundance for the following isotopes:
 W-180 179.9467 amu 0.12%
W-182 181.9482 amu 26.50%
W-183 182.9502 amu 14.31%
W-184 183.9509 amu 30.64%
W-186 185.9544 amu 28.43%

Accepted Answer

A) 183.75 amu 
B) 183.84 amu 
C) 182.98 amu 
D) 184.41 amu 
E) 183.92 amu 
A) 183.75 amu 
B) 183.84 amu 
C) 182.98 amu 
D) 184.41 amu 
E) 183.92 amu

Question 4

Which of the following statements is TRUE according to Dalton's atomic theory?

Accepted Answer

A) Atoms combine in simple fraction ratios to form compounds. 
B) All atoms of chlorine have identical properties to other elements with similar mass. 
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide. 
D) Atoms of carbon do not change into another element during a chemical reaction with chlorine. 
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. 
A) Atoms combine in simple fraction ratios to form compounds. 
B) All atoms of chlorine have identical properties to other elements with similar mass. 
C) Atoms of carbon can be changed into atoms of oxygen when creating carbon dioxide. 
D) Atoms of carbon do not change into another element during a chemical reaction with chlorine. 
E) An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen.

Question 5

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 6

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 7

How many atoms are in 2.50 moles of CO2?

Accepted Answer

A) 4.52 × 1024 atoms 
B) 1.51 × 1024 atoms 
C) 5.02 × 1023 atoms 
D) 3.01 × 1024 atoms 
E) 7.53 × 1023 atoms 
A) 4.52 × 1024 atoms 
B) 1.51 × 1024 atoms 
C) 5.02 × 1023 atoms 
D) 3.01 × 1024 atoms 
E) 7.53 × 1023 atoms

Question 8

Which of the following contains the FEWEST atoms? You shouldn't need to do a calculation here.

Accepted Answer

A) 4.0 g Li 
B) 4.0 g Na 
C) 4.0 g Rb 
D) 4.0 g K 
E) 4.0 g Ca 
A) 4.0 g Li 
B) 4.0 g Na 
C) 4.0 g Rb 
D) 4.0 g K 
E) 4.0 g Ca

Question 9

Identify the symbol for fluorine.

Accepted Answer

A) F 
B) Fl 
C) Fo 
D) Fu 
E) Fr 
A) F 
B) Fl 
C) Fo 
D) Fu 
E) Fr

Question 10

When forming an ion, calcium, Ca, will ________ electron(s).

Accepted Answer

A) gain one 
B) gain two 
C) gain three 
D) lose one 
E) lose two 
A) gain one 
B) gain two 
C) gain three 
D) lose one 
E) lose two

Question 11

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

Accepted Answer

A) F-, Ne, Mg2+ 
B) Ge, Se2-, Br- 
C) K+, Rb+, Cs+ 
D) Br, Br-, Br+ 
A) F-, Ne, Mg2+ 
B) Ge, Se2-, Br- 
C) K+, Rb+, Cs+ 
D) Br, Br-, Br+

Question 12

Isotopes differ in the number of

Accepted Answer

A) protons. 
B) neutrons. 
C) electrons. 
D) none of the above 
E) all of the above 
A) protons. 
B) neutrons. 
C) electrons. 
D) none of the above 
E) all of the above

Question 13

Predict the charge that an ion formed from sulfur would have.

Accepted Answer

A) 1- 
B) 6+ 
C) 3- 
D) 4+ 
E) 2- 
A) 1- 
B) 6+ 
C) 3- 
D) 4+ 
E) 2-

Question 14

The mass number of an atom of 128Xe is ________.

Accepted Answer

A) 54 
B) 182 
C) 74 
D) 128 
E) 120 
A) 54 
B) 182 
C) 74 
D) 128 
E) 120

Question 15

Identify the symbol for silver.

Accepted Answer

A) S 
B) Si 
C) Ar 
D) Ag 
E) Sl 
A) S 
B) Si 
C) Ar 
D) Ag 
E) Sl

Question 16

Identify the chemical symbol of element Q in  .

Accepted Answer

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

Question 17

What is the chemical symbol for titanium?

Accepted Answer

A) Th 
B) Ti 
C) Tl 
D) Tm 
A) Th 
B) Ti 
C) Tl 
D) Tm

Question 18

Match the following.

-magnesium

Accepted Answer

A) Si 
B) Fe 
C) Mg 
D) C 
E) K 
A) Si 
B) Fe 
C) Mg 
D) C 
E) K

Question 19

Zinc has five naturally occurring isotopes, Zn-64, Zn-66, Zn-67, Zn-68 and Zn-70. Calculate the atomic mass of zinc given the following abundances and atomic masses for the isotopes: Zn-64 63.9291 amu 48.61%
Zn-66 65.9260 amu 27.9%
Zn-67 66.9271 amu 4.1%
Zn-68 67.9248 amu 18.75%
Zn-70 69.9253 amu 0.62%

Accepted Answer

A) 65.34 amu 
B) 65.38 amu 
C) 65.65 amu 
D) 65.19 amu 
E) 65.85 amu 
A) 65.34 amu 
B) 65.38 amu 
C) 65.65 amu 
D) 65.19 amu 
E) 65.85 amu

Question 20

How many protons does the Br- ion possess?

Accepted Answer

A) 34 
B) 36 
C) 6 
D) 8 
E) 35 
A) 34 
B) 36 
C) 6 
D) 8 
E) 35

Exam 2: Atoms and Elements

If 3.6 g of chlorine combines with sodium to make 6.0 g of sodium chloride, what mass of sodium is required?

Carbon has two naturally occurring isotopes, carbon-12 and carbon-13. The more common isotope of carbon is carbon-12 with an abundance of 98.93% while carbon-13 has an atomic mass of 13.00335 amu. Calculate the atomic mass of carbon-12 if the atomic mass of carbon is 12.0107 amu.

Calculate the atomic mass of tungsten given the atomic mass and percent abundance for the following isotopes: W-180 179.9467 amu 0.12% W-182 181.9482 amu 26.50% W-183 182.9502 amu 14.31% W-184 183.9509 amu 30.64% W-186 185.9544 amu 28.43%

Which of the following statements is TRUE according to Dalton's atomic theory?

Which element has the chemical symbol Ru?

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

How many atoms are in 2.50 moles of CO2?

Which of the following contains the FEWEST atoms? You shouldn't need to do a calculation here.

Identify the symbol for fluorine.

When forming an ion, calcium, Ca, will ________ electron(s).

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

Isotopes differ in the number of

Predict the charge that an ion formed from sulfur would have.

The mass number of an atom of 128Xe is ________.

Identify the symbol for silver.

Identify the chemical symbol of element Q in .

What is the chemical symbol for titanium?

Match the following. -magnesium

How many protons does the Br- ion possess?

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 Metallury

Transition Metals and Coordination Compounds

Filters

How many atoms are in 2.50 moles of CO₂?

The mass number of an atom of 128_Xe is ________.

How many protons does the Br^- ion possess?