Question 1

The compound, NaH2PO4, is present in many baking powders. What is its name?

Accepted Answer

A)  Sodium biphosphate
B)  Sodium hydrogen phosphate
C)  Sodium dihydrogen phosphate
D)  Sodium hydrophosphate
E)  Sodium dihydride phosphateF) A) and C)
G) A) and B)

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

Question 3

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)  S 2N 4
B)  S 4N 2
C)  4SN 2
D)  S 4N
E)  S 2NF) All of the above
G) A) and E)

Question 5

A column of the periodic table is called a

Accepted Answer

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

Question 6

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015121 amu)  and 7Li (isotopic mass = 7.016003 amu) . Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6?

Accepted Answer

A)  92.50%
B)  86.66%
C)  46.16%
D)  7.503%
E)  6.080%F) A) and D)
G) B) and E)

Question 7

All neutral atoms of tin have 50 protons and 50 electrons.

Accepted Answer

A) True 
 B)False

Question 8

Which one of the following combinations of names and formulas of ions is incorrect?

Accepted Answer

A)  O 2− oxide
B)  Cd 2+ cadmium
C)  ClO 3 − chlorate
D)  HCO 3 − hydrogen carbonate
E)  NO 2 − nitrateF) B) and E)
G) A) and B)

Question 9

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

Accepted Answer

A)  NaO
B)  NaO 2
C)  Na 2O 2
D)  Na 2O
E)  NaH 2O 2F) C) and D)
G) None of the above

Question 10

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

Question 11

What are the approximate carbon:hydrogen mass ratios in methane (CH4)  and ethyne (C2H2) ?

Accepted Answer

A)  1:4 and 1:1
B)  3:2 and 6:1
C)  3:1 and 12:1
D)  3:2 and 12:1
E)  3:1 and 6:1F) A) and E)
G) C) and E)

Question 12

A red glaze on porcelain can be produced by using MnSO4. What is its name?

Accepted Answer

A)  Manganese disulfate
B)  Manganese(II) sulfate
C)  Manganese(IV) sulfate
D)  Manganese sulfate
E)  Manganese(I) sulfateF) None of the above
G) C) and D)

Question 13

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

Question 14

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon. 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon.   A) 29.2252 amu B) 28.9757 amu C) 28.7260 amu D) 28.0855 amu E) 27.9801 amu" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  29.2252 amu
B)  28.9757 amu
C)  28.7260 amu
D)  28.0855 amu
E)  27.9801 amuF) A) and D)
G) C) and E)

Question 15

The formula of heptane is

Accepted Answer

A)  C 6H 12.
B)  C 6H 14.
C)  C 7H 14.
D)  C 7H 16.
E)  C 8H 16.F) A) and B)
G) A) and C)

Question 16

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

Accepted Answer

A)  CaCl 2
B)  NaSO 4
C)  MgCO 3
D)  KF
E)  Cu(NO 3) 2F) C) and E)
G) C) and D)

Question 17

When an alkali metal combines with a non-metal, a covalent bond is normally formed.

Accepted Answer

A) True 
 B)False

Question 18

What is the name of the acid formed when HBr gas is dissolved in water?

Accepted Answer

A)  Bromic acid
B)  Bromous acid
C)  Hydrobromic acid
D)  Hydrobromous acid
E)  Hydrobromidic acidF) A) and C)
G) A) and D)

Question 19

Which one of the following groups does not contain any metals?

Accepted Answer

A)  C, S, As, H
B)  Cu, P, Se, Kr
C)  N, Ne, Nd, Np
D)  Xe, Hg, Ge, O
E)  Cl, Al, Si, ArF) None of the above
G) A) and E)

Question 20

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Accepted Answer

A)  I 2O 5
B)  IO 5
C)  2IO 5
D)  I 5O 2
E)  (IO 5) 2F) A) and B)
G) A) and C)

Exam 2: The Components of Matter

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

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

Correct Answer
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The formula of heptane is

Correct Answer
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What is the name of the acid formed when HBr gas is dissolved in water?

Correct Answer
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The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Correct Answer
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Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, ²⁸Si, ²⁹Si, and ³⁰Si. Calculate the atomic mass of silicon.

Correct Answer
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When an alkali metal combines with a non-metal, a covalent bond is normally formed.

Correct Answer
verified

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

Correct Answer
verified

Which of the following is a metal?

Correct Answer
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What are the approximate carbon:hydrogen mass ratios in methane (CH₄) and ethyne (C₂H₂) ?

Correct Answer
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Correct Answer
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Which one of the following groups does not contain any metals?

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

Correct Answer
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Which one of the following combinations of names and formulas of ions is incorrect?

Correct Answer
verified

The compound, NaH₂PO₄, is present in many baking powders. What is its name?

Correct Answer
verified

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

Correct Answer
verified

A column of the periodic table is called a

Correct Answer
verified

A red glaze on porcelain can be produced by using MnSO₄. What is its name?

Correct Answer
verified

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Correct Answer
verified

All neutral atoms of tin have 50 protons and 50 electrons.

Correct Answer
verified

Exam 2: The Components of Matter

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The formula of heptane is

Correct AnswerverifiedShow Answer

What is the name of the acid formed when HBr gas is dissolved in water?

Correct AnswerverifiedShow Answer

The mass of a neutron is equal to the mass of a proton plus the mass of an electron.

Correct AnswerverifiedShow Answer

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon.

Correct AnswerverifiedShow Answer

When an alkali metal combines with a non-metal, a covalent bond is normally formed.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a metal?

Correct AnswerverifiedShow Answer

What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne (C2H2) ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following groups does not contain any metals?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following combinations of names and formulas of ions is incorrect?

Correct AnswerverifiedShow Answer

The compound, NaH2PO4, is present in many baking powders. What is its name?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A column of the periodic table is called a

Correct AnswerverifiedShow Answer

A red glaze on porcelain can be produced by using MnSO4. What is its name?

Correct AnswerverifiedShow Answer

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

Correct AnswerverifiedShow Answer

All neutral atoms of tin have 50 protons and 50 electrons.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, ²⁸Si, ²⁹Si, and ³⁰Si. Calculate the atomic mass of silicon.

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

What are the approximate carbon:hydrogen mass ratios in methane (CH₄) and ethyne (C₂H₂) ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

The compound, NaH₂PO₄, is present in many baking powders. What is its name?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A red glaze on porcelain can be produced by using MnSO₄. What is its name?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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