Question 1

The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

Accepted Answer

A)   potassium chlorite
B)   potassium chloride
C)   potassium(I)  chlorite
D)   potassium(I)  chlorate
E)   potassium chlorateF) B) and E)
G) A) and B)

Question 2

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)   K2Mn2O7F) A) and B)
G) A) and C)

Question 3

element that lies in period 4?

Accepted Answer

A)   Cr
B)   Hf
C)   W
D)   Ti
E)   SeF) A) and E)
G) A) and B)

Question 4

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 B)
G) C) and D)

Question 5

Who is credited with discovering the atomic nucleus?

Accepted Answer

A)   Dalton
B)   Gay-Lussac
C)   Thomson
D)   Millikan
E)   RutherfordF) C) and E)
G) All of the above

Question 6

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

Accepted Answer

A)   O2- oxide
B)   Al3+ aluminum
C)   NO3- nitrate
D)   PO43- phosphate
E)   CrO42- chromateF) A) and E)
G) A) and D)

Question 7

Select the incorrect statement about elements and compounds.

Accepted Answer

A)   All ionic compounds are neutral.
B)   Some elements exist as molecules.
C)   The bonding in compounds may be covalent or ionic.
D)   The molecular formula of a compound provides more information than the structural formula.
E)   Among the elements, there are more metals than non-metals.F) A) and C)
G) A) and B)

Question 8

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

Question 9

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

Accepted Answer

A)   H3PO4 phosphoric acid
B)   HNO3 nitric acid
C)   NaHCO3 sodium carbonate
D)   H2CO3 carbonic acid
E)   KOH potassium hydroxideF) B) and D)
G) None of the above

Question 10

A) Give the names of the following ions: (i) O22- and (ii) SO42-
B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

Accepted Answer

a. (i) peroxide and ...

Question 11

Rutherford bombarded gold foil with alpha (a)  particles and found that a small percentage of the particles were deflected. Which of the following was not accounted for by the model he proposed for the structure of atoms?

Accepted Answer

A)   the small size of the nucleus
B)   the charge on the nucleus
C)   the total mass of the atom
D)   the existence of protons
E)   the presence of electrons outside the nucleusF) A) and B)
G) All of the above

Question 12

Which of the following is the empirical formula for hexane, C6H14?

Accepted Answer

A)   C12H28
B)   C6H14
C)   C3H7
D)   CH2.3
E)   C0.43HF) A) and B)
G) A) and C)

Question 13

What is the name of P4Se3?

Accepted Answer

A)   phosphorus selenide
B)   phosphorus triselenide
C)   tetraphosphorus selenide
D)   phosphoric selenide
E)   tetraphosphorus triselenideF) B) and C)
G) None of the above

Question 14

Kaolinite, a clay mineral with the formula Al4Si4O10(OH) 8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

Accepted Answer

A)   1.792 mass %
B)   24.80 mass %
C)   30.81 mass %
D)   34.12 mass %
E)   55.81 mass %F) A) and C)
G) B) and C)

Question 15

Sodium chromate is used to protect iron from corrosion and rusting. Determine its molecular mass.

Accepted Answer

A)   261.97 amu
B)   238.98 amu
C)   161.97 amu
D)   138.98 amu
E)   74.99 amuF) C) and D)
G) C) and E)

Question 16

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

Question 17

Who is credited with measuring the mass/charge ratio of the electron?

Accepted Answer

A)   Dalton
B)   Gay-Lussac
C)   Thomson
D)   Millikan
E)   RutherfordF) A) and B)
G) B) and D)

Question 18

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) All of the above
G) A) and E)

Question 19

The substance, CoCl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

Accepted Answer

A)   cobalt dichloride
B)   cobalt(II)  chloride
C)   cobalt chloride
D)   cobaltic chloride
E)   copper(II)  chlorideF) A) and D)
G) B) and C)

Question 20

Which of the following ions occurs commonly?

Accepted Answer

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

Exam 2: The Components of Matter

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

Correct AnswerverifiedShow Answer

Sodium chromate is used to protect iron from corrosion and rusting. Determine its molecular mass.

Correct AnswerverifiedShow Answer

Select the incorrect statement about elements and compounds.

Correct AnswerverifiedShow Answer

element that lies in period 4?

Correct AnswerverifiedShow Answer

A) Give the names of the following ions: (i) O22- and (ii) SO42- B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

Correct Answerverifieda. (i) peroxide and ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Who is credited with measuring the mass/charge ratio of the electron?

Correct AnswerverifiedShow Answer

Which of the following ions occurs commonly?

Correct AnswerverifiedShow Answer

Who is credited with discovering the atomic nucleus?

Correct AnswerverifiedShow Answer

Kaolinite, a clay mineral with the formula Al4Si4O10(OH) 8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

Correct AnswerverifiedShow Answer

The substance, CoCl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

Correct AnswerverifiedShow Answer

What is the name of P4Se3?

Correct AnswerverifiedShow Answer

Which of the following is the empirical formula for hexane, C6H14?

Correct AnswerverifiedShow Answer

Rutherford bombarded gold foil with alpha (a) particles and found that a small percentage of the particles were deflected. Which of the following was not accounted for by the model he proposed for the structure of atoms?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A) Give the names of the following ions: (i) O₂^2- and (ii) SO₄^2- B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

Correct Answer
verified
a. (i) peroxide and ...
View Answer

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Kaolinite, a clay mineral with the formula Al₄Si₄O₁₀(OH) ₈, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

Correct Answer
verified

The substance, CoCl₂, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

Correct Answer
verified

Correct Answer
verified

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

The substance, KClO₃, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

Correct Answer
verified

What is the name of P₄Se₃?

Correct Answer
verified

Which of the following is the empirical formula for hexane, C₆H₁₄?

Correct Answer
verified

Correct Answer
verified