Question 1

Which set of compounds illustrates the Law of Multiple Proportions?

Accepted Answer

A)  CH₄, C₂H₆, C₃H₈
B)  NO, NH₃, NH₄Cl
C)  H₂O, H₂
D)  all of these A

Question 2

Antoine Lavoisier is often credited with doing more than anyone else to establish chemistry as a quantitative science.What was the significance of Lavoisier's work?

Accepted Answer

careful me...

Question 3

When added to a sealed flask and heated,6.0 g of carbon and 16.0 g of oxygen react to form 22.0 g of carbon dioxide.How much carbon dioxide is formed when 24.0 g of carbon is reacted with 100.0 g of oxygen?

Accepted Answer

A)  40.0 g
B)  44.0 g
C)  88.0 g
D)  112.0 g

Question 4

Explain why Mendeleev left gaps in his periodic table of the elements.

Accepted Answer

Mendeleev left gaps in his periodic tabl...

Question 5

Is it always possible to recycle and reuse materials?

Accepted Answer

A)  Yes, because atoms cannot be destroyed in a chemical reaction.
B)  Yes, because atoms can only be rearranged in a chemical reaction.
C)  No, because atoms can be changed into other kinds of atoms.
D)  No, if it is financially impractible to do it.

Question 6

The atomic masses for elements are

Accepted Answer

A)  actual masses determined by weighing individual atoms.
B)  relative masses determined by comparison with a standard reference.
C)  the same as the atomic number.
D)  unknown.

Question 7

For which of the following would recycling of iron NOT be practical?

Accepted Answer

A)  old cars that are compressed in junkyards
B)  steel beams that have been removed from a bridge
C)  rust that flakes off a car body
D)  wrought iron fences

Question 8

Which set of compounds illustrates the Law of Multiple Proportions?

Accepted Answer

A)  NH₃, PH₃, AsH₃
B)  CH₃, CF₃, CCl₃
C)  NH₃, N₂H₄
D)  all of these

Question 9

All of the following are examples of molecules EXCEPT ________.

Accepted Answer

A)  Si
B)  CO
C)  I₂
D)  NO₂

Question 10

Which of the following changes is NOT an example of green chemistry?

Accepted Answer

A)  replacing mercury thermometers with alcohol thermometers
B)  using large amounts of solvents such as benzene, which is a carcinogen
C)  replacing energy from coal-fired power plants with energy from alternative sources
D)  replacing lead in paint with titanium dioxide

Question 11

Describe what happens in a chemical reaction.

Accepted Answer

The arrang...

Question 12

John Dalton discovered which of the following laws?

Accepted Answer

A)  The Law of Conservation of Mass
B)  The Law of Definite Proportions
C)  The Law of Constant Composition
D)  The Law of Multiple Proportions

Question 13

Distinguish between a compound and a mixture.

Accepted Answer

A compound and a mixture are two differe...

Question 14

The Greek word atomos means

Accepted Answer

A)  atom.
B)  uncuttable.
C)  invisible.
D)  continuous.

Question 15

Which of the following was NOT explained by Dalton's atomic theory?

Accepted Answer

A)  the Law of Conservation of Mass
B)  the Law of Multiple Proportions
C)  the difference between isotopes of an element
D)  the difference between elements and compounds

Question 16

Recycling of hazardous materials is important.

Accepted Answer

A) True 
 B)False

Question 17

Substance A contains 85% carbon and 15% hydrogen.Substance B contains 85 % carbon and 15% hydrogen.A and B are the same substance.

Accepted Answer

A) True 
 B)False  True

Question 18

The Law of Definite Proportions was first stated by

Accepted Answer

A)  Lavoisier.
B)  Galileo.
C)  Dalton.
D)  Proust.

Question 19

Which philosopher believed that matter was continuous and was not made up of atoms?

Accepted Answer

A)  Aristotle
B)  Dalton
C)  Democritus
D)  Lavoisier

Question 20

When Mendeleev developed his periodic table,he placed the greatest emphasis on

Accepted Answer

A)  the atomic number of the elements.
B)  putting elements with similar properties in the same column.
C)  leaving no holes or blank spaces in the table.
D)  the melting points of the elements. B

Exam 2: Atoms

Which set of compounds illustrates the Law of Multiple Proportions?

Correct AnswerverifiedA

Antoine Lavoisier is often credited with doing more than anyone else to establish chemistry as a quantitative science.What was the significance of Lavoisier's work?

Correct Answerverifiedcareful me...View AnswerShow Answer

When added to a sealed flask and heated,6.0 g of carbon and 16.0 g of oxygen react to form 22.0 g of carbon dioxide.How much carbon dioxide is formed when 24.0 g of carbon is reacted with 100.0 g of oxygen?

Correct AnswerverifiedShow Answer

Explain why Mendeleev left gaps in his periodic table of the elements.

Correct AnswerverifiedMendeleev left gaps in his periodic tabl...View AnswerShow Answer

Is it always possible to recycle and reuse materials?

Correct AnswerverifiedShow Answer

The atomic masses for elements are

Correct AnswerverifiedShow Answer

For which of the following would recycling of iron NOT be practical?

Correct AnswerverifiedShow Answer

Which set of compounds illustrates the Law of Multiple Proportions?

Correct AnswerverifiedShow Answer

All of the following are examples of molecules EXCEPT ________.

Correct AnswerverifiedShow Answer

Which of the following changes is NOT an example of green chemistry?

Correct AnswerverifiedShow Answer

Describe what happens in a chemical reaction.

Correct AnswerverifiedThe arrang...View AnswerShow Answer

John Dalton discovered which of the following laws?

Correct AnswerverifiedShow Answer

Distinguish between a compound and a mixture.

Correct AnswerAnswered by ExamLex AIA compound and a mixture are two differe...View AnswerShow Answer

The Greek word atomos means

Correct AnswerverifiedShow Answer

Which of the following was NOT explained by Dalton's atomic theory?

Correct AnswerverifiedShow Answer

Recycling of hazardous materials is important.

Correct AnswerverifiedShow Answer

Substance A contains 85% carbon and 15% hydrogen.Substance B contains 85 % carbon and 15% hydrogen.A and B are the same substance.

Correct AnswerverifiedTrue

The Law of Definite Proportions was first stated by

Correct AnswerverifiedShow Answer

Which philosopher believed that matter was continuous and was not made up of atoms?

Correct AnswerverifiedShow Answer

When Mendeleev developed his periodic table,he placed the greatest emphasis on

Correct AnswerverifiedB

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Mendeleev left gaps in his periodic tabl...
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The arrang...
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A compound and a mixture are two differe...
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