Question 1

Which of the following compounds is covalent?

Accepted Answer

A)   CaCl2
B)   MgO
C)   Al2O3
D)   Cs2S
E)   PCl3F) B) and D)
G) All of the above

Question 2

What is the chemical symbol for the group 6A (16)  element that lies in period 4?

Accepted Answer

A)   Cr
B)   Hf
C)   W
D)   Ti
E)   SeF) All of the above
G) A) and C)

Question 3

Which one of the following formulas of ionic compounds is the least likely to be correct?

Accepted Answer

A)   CaCl2
B)   NaSO4
C)   MgCO3
D)   KF
E)   Cu(NO3) 2F) All of the above
G) D) and E)

Question 4

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

Accepted Answer

A)   magnesium difluoride
B)   magnesium fluoride
C)   magnesium(II)  fluoride
D)   monomagnesium difluoride
E)   None of these choices are correctF) A) and E)
G) A) and D)

Question 5

Which of the following is a metal?

Accepted Answer

A)   nitrogen, N, Z = 7
B)   phosphorus, P, Z = 15
C)   arsenic, Z = 33
D)   thallium, Tl, Z = 81
E)   silicon, Si, Z = 14F) All of the above
G) B) and D)

Question 6

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

Accepted Answer

A)   S2N4
B)   S4N2
C)   4SN2
D)   S4N
E)   S2NF) C) and D)
G) A) and B)

Question 7

A column of the periodic table is called a

Accepted Answer

A)   group.
B)   period.
C)   isotopic mixture.
D)   pillar.
E)   shell.F) None of the above
G) A) and B)

Question 8

What is the formula for lead (II)  oxide?

Accepted Answer

A)   PbO
B)   PbO2
C)   Pb2O
D)   PbO4
E)   Pb2O3F) A) and E)
G) A) and D)

Question 9

Which of the following symbols does not represent an element?

Accepted Answer

A)   O2
B)   Co
C)   HF
D)   Cs
E)   XeF) A) and D)
G) C) and D)

Question 10

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81,  . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

Accepted Answer

A)   35, 46, 81
B)   35, 81, 46
C)   81, 46, 35
D)   46, 81, 35
E)   35, 81, 116F) B) and D)
G) B) and C)

Question 11

For the element bromine, the symbol, group number, group name and physical state are, respectively

Accepted Answer

A)   Bo, 17, noble gas, gas.
B)   B, 13, semimetal, solid.
C)   Br, 17, halogen, liquid.
D)   Br, 17, halogen, gas.
E)   Br, 15, chalcogenide, gas.F) A) and B)
G) A) and C)

Question 12

In the modern periodic table, the order in which the elements are placed is based on

Accepted Answer

A)   atomic mass.
B)   mass number.
C)   atomic number.
D)   atomic size.
E)   chemical reactivity.F) All of the above
G) A) and E)

Question 13

Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

Accepted Answer

A)   NaO
B)   NaO2
C)   Na2O2
D)   Na2O
E)   NaH2O2F) D) and E)
G) A) and B)

Question 14

Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

Accepted Answer

A)   77.9 amu
B)   80.0 amu
C)   80.1 amu
D)   80.9 amu
E)   88.9 amuF) All of the above
G) B) and C)

Question 15

The formula C9H20 is an empirical formula.

Accepted Answer

A) True 
 B)False

Question 16

Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?

Accepted Answer

A)   BaF2, ionic compound
B)   BaF2, covalent compound
C)   BaF, ionic compound
D)   BaF, covalent compound
E)   Ba2F, ionic compoundF) A) and B)
G) D) and E)

Question 17

J. J. Thomson studied cathode ray particles (electrons)  and was able to measure the mass/charge ratio. His results showed that

Accepted Answer

A)   the mass/charge ratio varied with as the cathode material was changed.
B)   the charge was always a whole-number multiple of some minimum charge.
C)   matter included particles much smaller than the atom.
D)   atoms contained dense areas of positive charge.
E)   atoms are largely empty space.F) C) and E)
G) A) and B)

Question 18

Which of the following sets are isoelectronic (i.e., have the same number of electrons) ? 
i. Br-, Kr, Sr2+
Ii. C, N-, O2-
Iii. Mg2+, Ca2+, Sr2+
Iv. O2-, O, O2+
V. Ag+, Cd2+, Pd

Accepted Answer

A)   i and ii
B)   i and v
C)   i, iii and iv
D)   ii, iii and v
E)   i, iii iv and vF) A) and E)
G) All of the above

Question 19

Which of the following elements are the least reactive?

Accepted Answer

A)   alkali metals
B)   noble gases
C)   halogens
D)   alkaline earth metals
E)   metalloidsF) A) and E)
G) B) and C)

Question 20

After an atom has lost an electron it becomes a/an ______ and has a _______ charge.

Accepted Answer

A)   anion, positive
B)   isotope, negative
C)   anion, negative
D)   cation, positive
E)   nucleus, positiveF) A) and C)
G) C) and D)

Exam 2: The Components of Matter

The colorless substance, MgF2, is used in the ceramics and glass industry. What is its name?

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For the element bromine, the symbol, group number, group name and physical state are, respectively

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Which of the following elements are the least reactive?

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Which of the following sets are isoelectronic (i.e., have the same number of electrons) ? i. Br-, Kr, Sr2+ Ii. C, N-, O2- Iii. Mg2+, Ca2+, Sr2+ Iv. O2-, O, O2+ V. Ag+, Cd2+, Pd

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Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

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Barium fluoride is used in embalming and in glass manufacturing. Which of the following gives the formula and bonding for barium fluoride?

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What is the chemical symbol for the group 6A (16) element that lies in period 4?

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The formula C9H20 is an empirical formula.

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In the modern periodic table, the order in which the elements are placed is based on

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Which of the following is a metal?

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Which of the following compounds is covalent?

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Bromine has two naturally-occurring isotopes. 79Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

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After an atom has lost an electron it becomes a/an ______ and has a _______ charge.

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Which of the following symbols does not represent an element?

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Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula?

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Which one of the following formulas of ionic compounds is the least likely to be correct?

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J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that

Correct AnswerverifiedShow Answer

A column of the periodic table is called a

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Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.

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What is the formula for lead (II) oxide?

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The colorless substance, MgF₂, is used in the ceramics and glass industry. What is its name?

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Which of the following sets are isoelectronic (i.e., have the same number of electrons) ? i. Br^-, Kr, Sr²⁺ Ii. C, N^-, O^2- Iii. Mg²⁺, Ca²⁺, Sr²⁺ Iv. O^2-, O, O²⁺ V. Ag⁺, Cd²⁺, Pd

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The formula C₉H₂₀ is an empirical formula.

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Bromine has two naturally-occurring isotopes. ⁷⁹Br has a mass of 78.9 amu and accounts for 50.3% of bromine atoms. If the atomic mass of bromine is 79.9 amu, what is the mass of an atom of the second bromine isotope?

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After an atom has lost an electron it becomes a/an and has a _ charge.

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