Question 1

Atoms of the same element that have different masses are called

Accepted Answer

A) allotropes. 
B) anions. 
C) isotopes. 
D) molecules. 
A) allotropes. 
B) anions. 
C) isotopes. 
D) molecules.

Question 2

The "father of modern chemistry" is

Accepted Answer

A) Boyle. 
B) Lavoisier. 
C) Mendeleev. 
D) Proust. 
A) Boyle. 
B) Lavoisier. 
C) Mendeleev. 
D) Proust.

Question 3

Döbereiner's Triads and Mendeleev's Periodic Table were both based on the idea that properties of elements tended to repeat.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following statements about atoms is NOT true?

Accepted Answer

A) Atoms are too small to be seen even with a microscope. 
B) Atoms make up every material. 
C) Atoms are the smallest particles that are characteristic of a given element. 
D) No atoms have been synthesized by scientists. 
A) Atoms are too small to be seen even with a microscope. 
B) Atoms make up every material. 
C) Atoms are the smallest particles that are characteristic of a given element. 
D) No atoms have been synthesized by scientists.

Question 5

CO₂ always contains 3 g of C for every 8 g of O.This is an example of

Accepted Answer

A) Dalton's Atomic Theory. 
B) Lavoisier's Law of Conservation of Mass. 
C) Dalton's Law of Multiple Proportions. 
D) Proust's Law of Definite Proportions. 
A) Dalton's Atomic Theory. 
B) Lavoisier's Law of Conservation of Mass. 
C) Dalton's Law of Multiple Proportions. 
D) Proust's Law of Definite Proportions.

Question 6

When 10.0 g of lead are heated with 1.6 g of sulfur,11.6 g of lead sulfide are formed.How many grams of lead sulfide form when 10.0 g of lead are heated with 3.0 g of sulfur?

Accepted Answer

The answer of When 10.0 g of lead are heated...

Question 7

Which discovery was NOT in conflict with Dalton's atomic theory?

Accepted Answer

A) the discovery of electrical charge 
B) the discovery of the electron 
C) the discovery of the element gallium 
D) the discovery of the proton 
A) the discovery of electrical charge 
B) the discovery of the electron 
C) the discovery of the element gallium 
D) the discovery of the proton

Question 8

If drops of water are subdivided to the ultimately smallest drops possible,what is the smallest particle of water that retains the chemical and physical properties of water?

Accepted Answer

A) molecule 
B) mixture 
C) atom 
D) micron 
A) molecule 
B) mixture 
C) atom 
D) micron

Question 9

Although all parts (postulates)of Dalton's atomic theory are important,which one of the postulates is crucial to explain the observations summarized by the Law of Definite Proportions?

Accepted Answer

A) Matter is composed of atoms. 
B) Atoms of the same element have the same properties. 
C) Atoms combine with other atoms in fixed, whole number ratios to form compounds. 
D) Atoms are very small. 
A) Matter is composed of atoms. 
B) Atoms of the same element have the same properties. 
C) Atoms combine with other atoms in fixed, whole number ratios to form compounds. 
D) Atoms are very small.

Question 10

Substance A contains 80% carbon and 20% hydrogen.Substance B contains 83% carbon and 17% hydrogen.A and B are the same substance.

Accepted Answer

A) True 
 B)False

Question 11

Germanium was discovered in 1886.Its existence had been predicted by Mendeleev.

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) the Law of Conservation of Mass 
B) the Law of Definite Proportions 
C) the Law of Multiple Proportions 
D) the periodic law 
A) the Law of Conservation of Mass 
B) the Law of Definite Proportions 
C) the Law of Multiple Proportions 
D) the periodic law

Question 13

By definition,which of the following can be broken down into simpler substances?

Accepted Answer

A) compound 
B) atom|ion 
C) solid 
D) liquid 
A) compound 
B) atom|ion 
C) solid 
D) liquid

Question 14

Which set of compounds illustrates the Law of Multiple Proportions?

Accepted Answer

A) SO₂, SO₃ 
B) N₂O, NO, NO₂ 
C) H₂O, H₂O₂ 
D) all of these 
A) SO₂, SO₃ 
B) N₂O, NO, NO₂ 
C) H₂O, H₂O₂ 
D) all of these

Question 15

Which one of the following statements is NOT a correct statement of the Law of Conservation of Mass?

Accepted Answer

A) The mass of a system is dependent upon chemical reactions that may occur. 
B) The mass of a system is conserved in a chemical reaction. 
C) Matter cannot be created or destroyed. 
D) Atoms are conserved in chemical reactions. 
A) The mass of a system is dependent upon chemical reactions that may occur. 
B) The mass of a system is conserved in a chemical reaction. 
C) Matter cannot be created or destroyed. 
D) Atoms are conserved in chemical reactions.

Question 16

In 1961,the reference for the atomic mass unit (amu or u)was changed from naturally occurring oxygen with a value of 16.000 u to one based on a single isotope of carbon (carbon-12).Why was it changed?

Accepted Answer

A) The atomic composition of oxygen varies depending upon its source. 
B) Carbon-12 is more common than oxygen. 
C) Carbon exists as only one isotope, carbon-12. 
D) Carbon can combine with four atoms of hydrogen to form CH₄, methane, while oxygen only combines with two atoms of hydrogen to form water, H₂O. 
A) The atomic composition of oxygen varies depending upon its source. 
B) Carbon-12 is more common than oxygen. 
C) Carbon exists as only one isotope, carbon-12. 
D) Carbon can combine with four atoms of hydrogen to form CH₄, methane, while oxygen only combines with two atoms of hydrogen to form water, H₂O.

Question 17

Methane can be decomposed into two simpler substances,hydrogen and carbon.Therefore,methane

Accepted Answer

A) is a solid. 
B) cannot be an element. 
C) must be a mixture. 
D) must have the formula CH₂. 
A) is a solid. 
B) cannot be an element. 
C) must be a mixture. 
D) must have the formula CH₂.

Question 18

Aristotle's idea that matter is continuous is still considered to be correct.

Accepted Answer

A) True 
 B)False

Question 19

Under conditions of limited oxygen,carbon burns to form carbon monoxide,a poisonous gas.In conditions with unlimited oxygen,carbon burns to form carbon dioxide.This illustrates the Law of

Accepted Answer

A) Conservation of Mass. 
B) Definite Proportions. 
C) different chemical reactions. 
D) Multiple Proportions. 
A) Conservation of Mass. 
B) Definite Proportions. 
C) different chemical reactions. 
D) Multiple Proportions.

Question 20

A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask.The total mass of the system is 225 grams.The flask is heated to cause the carbon and oxygen to react.The sealed flask is massed.What is the mass of the sealed flask?

Accepted Answer

A) 125 grams 
B) 150 grams 
C) 175 grams 
D) 225 grams 
A) 125 grams 
B) 150 grams 
C) 175 grams 
D) 225 grams

Exam 2: Atoms

Atoms of the same element that have different masses are called

The "father of modern chemistry" is

Döbereiner's Triads and Mendeleev's Periodic Table were both based on the idea that properties of elements tended to repeat.

Which of the following statements about atoms is NOT true?

CO₂ always contains 3 g of C for every 8 g of O.This is an example of

When 10.0 g of lead are heated with 1.6 g of sulfur,11.6 g of lead sulfide are formed.How many grams of lead sulfide form when 10.0 g of lead are heated with 3.0 g of sulfur?

Which discovery was NOT in conflict with Dalton's atomic theory?

If drops of water are subdivided to the ultimately smallest drops possible,what is the smallest particle of water that retains the chemical and physical properties of water?

Although all parts (postulates)of Dalton's atomic theory are important,which one of the postulates is crucial to explain the observations summarized by the Law of Definite Proportions?

Substance A contains 80% carbon and 20% hydrogen.Substance B contains 83% carbon and 17% hydrogen.A and B are the same substance.

Germanium was discovered in 1886.Its existence had been predicted by Mendeleev.

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

By definition,which of the following can be broken down into simpler substances?

Which set of compounds illustrates the Law of Multiple Proportions?

Which one of the following statements is NOT a correct statement of the Law of Conservation of Mass?

In 1961,the reference for the atomic mass unit (amu or u)was changed from naturally occurring oxygen with a value of 16.000 u to one based on a single isotope of carbon (carbon-12).Why was it changed?

Methane can be decomposed into two simpler substances,hydrogen and carbon.Therefore,methane

Aristotle's idea that matter is continuous is still considered to be correct.

Under conditions of limited oxygen,carbon burns to form carbon monoxide,a poisonous gas.In conditions with unlimited oxygen,carbon burns to form carbon dioxide.This illustrates the Law of

A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask.The total mass of the system is 225 grams.The flask is heated to cause the carbon and oxygen to react.The sealed flask is massed.What is the mass of the sealed flask?

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