Question 1

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) C) and E)
G) B) and E)

Question 2

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) B) and D)
G) B) and E)

Question 3

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 B)
G) C) and D)

Question 4

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) None of the above
G) All of the above

Question 5

The formula C9H20 is an empirical formula.

Accepted Answer

A) True 
 B)False

Question 6

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) B) and C)
G) A) and E)

Question 7

Which of the following compounds is covalent?

Accepted Answer

A)   CaCl2
B)   MgO
C)   Al2O3
D)   Cs2S
E)   PCl3F) A) and E)
G) B) and E)

Question 8

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 E)
G) A) and B)

Question 9

Which of the following symbols does not represent an element?

Accepted Answer

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

Question 10

A column of the periodic table is called a

Accepted Answer

A)   group.
B)   period.
C)   isotopic mixture.
D)   pillar.
E)   shell.F) C) and D)
G) A) and E)

Question 11

What is the formula for lead (II)  oxide?

Accepted Answer

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

Question 12

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) A) and D)
G) A) and C)

Question 13

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) B) and E)
G) A) and C)

Question 14

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

Accepted Answer

A)   S2N4
B)   S4N2
C)   4SN2
D)   S4N
E)   S2NF) None of the above
G) D) and E)

Question 15

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) B) and D)
G) All of the above

Question 16

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) B) and C)
G) None of the above

Question 17

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) A) and B)
G) B) and C)

Question 18

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) None of the above
G) B) and E)

Question 19

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) A) and D)
G) B) and E)

Question 20

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) C) and D)
G) B) and D)

Exam 2: The Components of Matter

A column of the periodic table is called a

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Which of the following compounds is covalent?

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The formula C9H20 is an empirical formula.

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What is the formula for lead (II) oxide?

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Which of the following symbols does not represent an element?

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Which of the following is a metal?

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

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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

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

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

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

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

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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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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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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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Which of the following elements are the least reactive?

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

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The formula C₉H₂₀ is an empirical formula.

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

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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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