Question 1

Compound 1 has a composition of 46.7 mass % of element A and 53.3 mass % of element B.A and B also form a second binary compound (compound 2) .If the compositions of the two compounds are consistent with the law of multiple proportions,which of the following compositions could be that of compound 2?

Accepted Answer

A)  23.4 mass % A 76.6 mass % B
B)  30.4 mass % A 69.6 mass % B
C)  33.3 mass % A 66.7 mass % B
D)  53.3 mass % A 46.7 mass % B
E)  73.3 mass % A 26.7 mass % BF) All of the above
G) A) and B)

Question 2

Silver chloride is used in photographic emulsions.What is its formula?

Accepted Answer

A)  Ag2Cl3
B)  Ag2Cl
C)  AgCl3
D)  AgCl2
E)  AgClF) A) and E)
G) B) and E)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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

Question 5

What is the name of the acid formed when H2S gas is dissolved in water?

Accepted Answer

A)  sulfuric acid
B)  sulfurous acid
C)  hydrosulfuric acid
D)  hydrosulfurous acid
E)  sulfidic acidF) A) and B)
G) None of the above

Question 6

In nature,some elements exist as molecules,while others do not.

Accepted Answer

A) True 
 B)False

Question 7

Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials.What is its formula?

Accepted Answer

A)  KMnO3
B)  KMnO4
C)  K2MnO4
D)  K(MnO4) 2
E)  K2Mn2O7 F) C) and E)
G) B) and C)

Question 8

What is the formula for lithium nitrite?

Accepted Answer

A)  LiNO2
B)  Li2NO2
C)  LiNO3
D)  Li2NO3
E)  LiNO4 F) B) and D)
G) A) and E)

Question 9

Dalton's atomic theory has required some modifications in the light of subsequent discoveries.For any two appropriate postulates of Dalton's atomic theory
a.state the postulate in its original form
b.In one sentence,describe why the postulate has needed modification.

Accepted Answer

Matter consists of atoms which are indiv...

Question 10

Which of the following ions occurs commonly?

Accepted Answer

A)  P3+
B)  Br7+
C)  O6+
D)  Ca2+
E)  K-F) A) and E)
G) A) and D)

Question 11

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

Accepted Answer

A)  S2N4
B)  S4N2
C)  4SN2
D)  S4N
E)  S2NF) All of the above
G) A) and C)

Question 12

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 D)
G) A) and C)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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)  NaH2O2 F) A) and B)
G) A) and C)

Question 15

Atoms X,Y,Z,and R have the following nuclear compositions: 
Which two are isotopes?

Accepted Answer

A)  X & Y
B)  X & R
C)  Y & R
D)  Z & R
E)  X & ZF) A) and B)
G) B) and C)

Question 16

a.Give the names of the following ions:
(i)NH4+
  (ii)SO32-
 b.Write down the formulas of the following ions:
(i)aluminum
(ii)carbonate

Accepted Answer

a.(i)ammon...

Question 17

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

Accepted Answer

A)  NH4Cl
B)  Ba(OH) 2
C)  Na2SO4
D)  Ca2NO3
E)  Cu(CN) 2 F) C) and D)
G) B) and D)

Question 18

Millikan's oil-drop experiment

Accepted Answer

A)  established the charge on an electron.
B)  showed that all oil drops carried the same charge.
C)  provided support for the nuclear model of the atom.
D)  suggested that some oil drops carried fractional numbers of electrons.
E)  suggested the presence of a neutral particle in the atom.F) C) and E)
G) D) and E)

Question 19

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 is correct,since they are all misspelledF) A) and E)
G) B) and C)

Question 20

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

Exam 2: The Components of Matter

Atoms X,Y,Z,and R have the following nuclear compositions: Which two are isotopes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

a.Give the names of the following ions: (i)NH4+ (ii)SO32- b.Write down the formulas of the following ions: (i)aluminum (ii)carbonate

Correct Answerverifieda.(i)ammon...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In nature,some elements exist as molecules,while others do not.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the name of the acid formed when H2S gas is dissolved in water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the formula for lithium nitrite?

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Silver chloride is used in photographic emulsions.What is its formula?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following ions occurs commonly?

Correct AnswerverifiedShow Answer

Millikan's oil-drop experiment

Correct AnswerverifiedShow Answer

Dalton's atomic theory has required some modifications in the light of subsequent discoveries.For any two appropriate postulates of Dalton's atomic theory a.state the postulate in its original form b.In one sentence,describe why the postulate has needed modification.

Correct AnswerverifiedMatter consists of atoms which are indiv...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials.What is its formula?

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

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a.Give the names of the following ions: (i)NH₄⁺ (ii)SO₃^2- b.Write down the formulas of the following ions: (i)aluminum (ii)carbonate

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a.(i)ammon...
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The compound,NaH₂PO₄,is present in many baking powders.What is its name?

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What is the name of the acid formed when H₂S gas is dissolved in water?

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

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Matter consists of atoms which are indiv...
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