Question 1

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

Question 2

Calcium hydroxide is used in mortar, plaster, and cement. What is its formula?

Accepted Answer

A)   CaOH
B)   CaOH2
C)   Ca2OH
D)   Ca(OH) 2
E)   CaHO2F) A) and B)
G) C) 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

Determine the molecular mass of iron (III)  bromide hexahydrate, a substance used as a catalyst in organic reactions.

Accepted Answer

A)   403.65 amu
B)   355.54 amu
C)   317.61 amu
D)   313.57 amu
E)   295.56 amuF) A) and D)
G) B) and D)

Question 5

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 E)
G) All of the above

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

Question 7

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

Question 8

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

Accepted Answer

A)   O2- oxide
B)   Cd2+ cadmium
C)   ClO3- chlorate
D)   HCO3- hydrogen carbonate
E)   NO2- nitrateF) A) and B)
G) D) and E)

Question 9

Which one of the following is a polyatomic cation?

Accepted Answer

A)   nitrate
B)   chromate
C)   permanganate
D)   hydronium
E)   potassiumF) C) and D)
G) A) and D)

Question 10

Ammonium sulfate, (NH4) 2SO4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Accepted Answer

A)   63.07 amu
B)   114.10 amu
C)   118.13 amu
D)   128.11 amu
E)   132.13 amuF) A) and E)
G) B) and C)

Question 11

Dalton's atomic theory has required some modifications in the light of subsequent discoveries. For any three 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

1. Matter consists of atoms which are in...

Question 12

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 E)
G) C) and E)

Question 13

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 D)

Question 14

The formula of heptane is

Accepted Answer

A)   C6H12.
B)   C6H14.
C)   C7H14.
D)   C7H16.
E)   C8H16.F) A) and E)
G) All of the above

Question 15

Modern studies have shown that the Law of Multiple Proportions is not valid.

Accepted Answer

A) True 
 B)False

Question 16

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Accepted Answer

Thomson measured m/e, the mass...

Question 17

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

Accepted Answer

A)   I2O5
B)   IO5
C)   2IO5
D)   I5O2
E)   (IO5) 2F) C) and D)
G) A) and C)

Question 18

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

Question 19

For each of the following elements, indicate whether it is a metal, a non-metal, or a metalloid:
a. S
b. Ge
c. g
d. H
e. I
f. Si

Accepted Answer

a. nonmetal
b. metal...

Question 20

Which one of the following statements about atoms and subatomic particles is correct?

Accepted Answer

A)   Rutherford discovered the atomic nucleus by bombarding gold foil with electrons.
B)   The proton and the neutron have identical masses.
C)   The neutron's mass is equal to that of a proton plus an electron.
D)   A neutral atom contains equal numbers of protons and electrons.
E)   An atomic nucleus contains equal numbers of protons and neutrons.F) B) and E)
G) A) and B)

Exam 2: The Components of Matter

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

Correct Answer
verified

Which one of the following is a polyatomic cation?

Correct Answer
verified

Determine the molecular mass of iron (III) bromide hexahydrate, a substance used as a catalyst in organic reactions.

Correct Answer
verified

Dalton's atomic theory has required some modifications in the light of subsequent discoveries. For any three 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 Answer
verified
1. Matter consists of atoms which are in...
View Answer

The formula of heptane is

Correct Answer
verified

Ammonium sulfate, (NH₄) ₂SO₄, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Correct Answer
verified

Modern studies have shown that the Law of Multiple Proportions is not valid.

Correct Answer
verified

Which one of the following statements about atoms and subatomic particles is correct?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

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

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

Correct Answer
verified

Which of the following is a metal?

Correct Answer
verified

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

Correct Answer
verified

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Correct Answer
verified
Thomson measured m/e, the mass...
View Answer

Calcium hydroxide is used in mortar, plaster, and cement. What is its formula?

Correct Answer
verified

For each of the following elements, indicate whether it is a metal, a non-metal, or a metalloid: a. S b. Ge c. g d. H e. I f. Si

Correct Answer
verified
a. nonmetal
b. metal...
View Answer

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

Correct Answer
verified

Exam 2: The Components of Matter

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

Correct AnswerverifiedShow Answer

Which one of the following is a polyatomic cation?

Correct AnswerverifiedShow Answer

Determine the molecular mass of iron (III) bromide hexahydrate, a substance used as a catalyst in organic reactions.

Correct AnswerverifiedShow Answer

Dalton's atomic theory has required some modifications in the light of subsequent discoveries. For any three 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 Answerverified1. Matter consists of atoms which are in...View AnswerShow Answer

The formula of heptane is

Correct AnswerverifiedShow Answer

Ammonium sulfate, (NH4) 2SO4, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Correct AnswerverifiedShow Answer

Modern studies have shown that the Law of Multiple Proportions is not valid.

Correct AnswerverifiedShow Answer

Which one of the following statements about atoms and subatomic particles is correct?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

Which of the following is a metal?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

State the two important experimental results (and the names of the responsible scientists) which enabled the mass of the electron to be determined.

Correct AnswerverifiedThomson measured m/e, the mass...View AnswerShow Answer

Calcium hydroxide is used in mortar, plaster, and cement. What is its formula?

Correct AnswerverifiedShow Answer

For each of the following elements, indicate whether it is a metal, a non-metal, or a metalloid: a. S b. Ge c. g d. H e. I f. Si

Correct Answerverifieda. nonmetalb. metal...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
1. Matter consists of atoms which are in...
View Answer

Correct Answer
verified

Ammonium sulfate, (NH₄) ₂SO₄, is a fertilizer widely used as a source of nitrogen. Calculate its molecular mass.

Correct Answer
verified

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

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

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Thomson measured m/e, the mass...
View Answer

Correct Answer
verified

Correct Answer
verified
a. nonmetal
b. metal...
View Answer

Correct Answer
verified