Question 1

Lavoisier performed many of the same experiments as his predecessors.The one thing that most distinguished Lavoisier's work was

Accepted Answer

A) the results. 
B) the mass measurements. 
C) the chemicals. 
D) the glassware. 
A) the results. 
B) the mass measurements. 
C) the chemicals. 
D) the glassware.

Question 2

Democritus thought that real substances were mixtures of various types of atoms.

Accepted Answer

A) True 
 B)False

Question 3

The Periodic Table is helpful in all of the following endeavors but one.Which is the exception?

Accepted Answer

A) predicting formulas of compounds 
B) predicting chemical reactivity of elements 
C) predicting physical properties of elements 
D) predicting monetary values of elements 
A) predicting formulas of compounds 
B) predicting chemical reactivity of elements 
C) predicting physical properties of elements 
D) predicting monetary values of elements

Question 4

When electricity is passed through molten potassium bromide,two simpler substances,potassium and bromine,are produced.Therefore,potassium bromide

Accepted Answer

A) cannot be an element. 
B) must be a mixture. 
C) has less mass than the resulting potassium and bromine do. 
D) must have the formula PB. 
A) cannot be an element. 
B) must be a mixture. 
C) has less mass than the resulting potassium and bromine do. 
D) must have the formula PB.

Question 5

Leucippus and Democritus based their ideas about atoms on careful experimental results.

Accepted Answer

A) True 
 B)False

Question 6

Perhaps the greatest triumph of Mendeleev's periodic table was

Accepted Answer

A) the use of rows and columns to organize the elements. 
B) the ability to predict electron configurations of elements. 
C) the use of atomic numbers as an organizing criterion. 
D) the prediction of the existence of undiscovered elements. 
A) the use of rows and columns to organize the elements. 
B) the ability to predict electron configurations of elements. 
C) the use of atomic numbers as an organizing criterion. 
D) the prediction of the existence of undiscovered elements.

Question 7

The observation that 10 g of hydrogen gas always combines with 80 g of oxygen gas to form 90 g of water,even when there is more than 80 g of oxygen present in the reaction container,illustrates the Law of

Accepted Answer

A) Definite Proportions. 
B) Multiple Proportions. 
C) ideal gases. 
D) excess reactants. 
A) Definite Proportions. 
B) Multiple Proportions. 
C) ideal gases. 
D) excess reactants.

Question 8

2 g of sulfur will react with 3 g of oxygen to produce 5 g of sulfur trioxide.If 54 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react,how much sulfur dioxide will be produced?

Accepted Answer

A) 54 g 
B) 81 g 
C) 135 g 
D) 154 g 
A) 54 g 
B) 81 g 
C) 135 g 
D) 154 g

Question 9

A molecule is a group of atoms that are chemically bonded together.

Accepted Answer

A) True 
 B)False

Question 10

Leucippus and Democritus proposed the "first" atomic view of matter.They arrived at this view based on

Accepted Answer

A) many experiments. 
B) careful measurements. 
C) philosophical and intuitive speculation. 
D) All of the above contributed to their atomic view. 
A) many experiments. 
B) careful measurements. 
C) philosophical and intuitive speculation. 
D) All of the above contributed to their atomic view.

Question 11

Mendeleev arranged elements in the periodic table primarily in order of their

Accepted Answer

A) atomic masses. 
B) atomic weights. 
C) both atomic weights and atomic numbers. 
D) number of neutrons. 
A) atomic masses. 
B) atomic weights. 
C) both atomic weights and atomic numbers. 
D) number of neutrons.

Question 12

The amount of carbon on the earth,including the atmosphere,

Accepted Answer

A) is essentially constant. 
B) is decreasing due to consumption of carbon based fuels, such as coal and petroleum. 
C) is increasing due to plant and animal growth on the planet. 
D) fluctuates dramatically with the seasons. 
A) is essentially constant. 
B) is decreasing due to consumption of carbon based fuels, such as coal and petroleum. 
C) is increasing due to plant and animal growth on the planet. 
D) fluctuates dramatically with the seasons.

Question 13

32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide.If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react,what is the mass of sulfur trioxide in the container after the reaction is completed?

Accepted Answer

A) 40 g 
B) 16 g 
C) 100 g 
D) 116 g 
A) 40 g 
B) 16 g 
C) 100 g 
D) 116 g

Question 14

According to Dalton's Atomic Theory,atoms of the same element may have different masses.

Accepted Answer

A) True 
 B)False

Question 15

The Law of Constant Composition and the Law of Definite Proportions are different names for the same phenomenon.

Accepted Answer

A) True 
 B)False

Question 16

Dalton's atomic theory states that atoms may change into other atoms in a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 17

The ability to recycle aluminum (or glass,or plastic)is ultimately an illustration of

Accepted Answer

A) the Law of the Conservation of Mass. 
B) the Law of Definite Proportions. 
C) the ingenuity of chemists. 
D) the Law of Multiple Proportions. 
A) the Law of the Conservation of Mass. 
B) the Law of Definite Proportions. 
C) the ingenuity of chemists. 
D) the Law of Multiple Proportions.

Question 18

Scientists can observe computer enhanced images of atoms.

Accepted Answer

A) True 
 B)False

Question 19

Mendeleev's periodic table organized elements in a systematic way.Which of the following attempted to arrange elements in a systematic way and can be considered a "precursor" of the modern periodic table?

Accepted Answer

A) Dalton's Atomic Theory 
B) Dalton's Atomic Masses 
C) Döbereiner's Triads 
D) Berzelius's Atomic Weights 
A) Dalton's Atomic Theory 
B) Dalton's Atomic Masses 
C) Döbereiner's Triads 
D) Berzelius's Atomic Weights

Question 20

When 28 g of nitrogen and 6 g of hydrogen react,34 g of ammonia are produced.If 80 g of nitrogen react with 4 g of hydrogen,how much ammonia will be produced?

Accepted Answer

A) 22.6 g 
B) 43 g 
C) 50 g 
D) 4 g 
A) 22.6 g 
B) 43 g 
C) 50 g 
D) 4 g

Exam 2: Atoms

Lavoisier performed many of the same experiments as his predecessors.The one thing that most distinguished Lavoisier's work was

Democritus thought that real substances were mixtures of various types of atoms.

The Periodic Table is helpful in all of the following endeavors but one.Which is the exception?

When electricity is passed through molten potassium bromide,two simpler substances,potassium and bromine,are produced.Therefore,potassium bromide

Leucippus and Democritus based their ideas about atoms on careful experimental results.

Perhaps the greatest triumph of Mendeleev's periodic table was

The observation that 10 g of hydrogen gas always combines with 80 g of oxygen gas to form 90 g of water,even when there is more than 80 g of oxygen present in the reaction container,illustrates the Law of

2 g of sulfur will react with 3 g of oxygen to produce 5 g of sulfur trioxide.If 54 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react,how much sulfur dioxide will be produced?

A molecule is a group of atoms that are chemically bonded together.

Leucippus and Democritus proposed the "first" atomic view of matter.They arrived at this view based on

Mendeleev arranged elements in the periodic table primarily in order of their

The amount of carbon on the earth,including the atmosphere,

32 g of sulfur will react with 48 g of oxygen to produce 80 g of sulfur trioxide.If 16 g of sulfur and 100 g of oxygen are placed into a sealed container and allowed to react,what is the mass of sulfur trioxide in the container after the reaction is completed?

According to Dalton's Atomic Theory,atoms of the same element may have different masses.

The Law of Constant Composition and the Law of Definite Proportions are different names for the same phenomenon.

Dalton's atomic theory states that atoms may change into other atoms in a chemical reaction.

The ability to recycle aluminum (or glass,or plastic)is ultimately an illustration of

Scientists can observe computer enhanced images of atoms.

Mendeleev's periodic table organized elements in a systematic way.Which of the following attempted to arrange elements in a systematic way and can be considered a "precursor" of the modern periodic table?

When 28 g of nitrogen and 6 g of hydrogen react,34 g of ammonia are produced.If 80 g of nitrogen react with 4 g of hydrogen,how much ammonia will be produced?

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