Question 1

Which of these are pure substances?
I. Steam
II. Crude oil
III. Salt water
IV. Gun powder
V. Oxygen
VI. Mercury

Accepted Answer

A)  I, II, and III 
B)  I and III 
C)  I, II, III, and V 
D)  I, III, and V 
E)  I, V, and VI 
A)  I, II, and III 
B)  I and III 
C)  I, II, III, and V 
D)  I, III, and V 
E)  I, V, and VI

Question 2

Identify the entities that will correctly complete the flow chart.

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 3

A substance composed of two or more different elements in fixed proportions is known as a(n) _____.

Accepted Answer

A)  atom 
B)  element 
C)  molecule 
D)  ion 
E)  compound 
A)  atom 
B)  element 
C)  molecule 
D)  ion 
E)  compound

Question 4

If 12.0 g of carbon react with 32.0 g of oxygen to form 44.0 g of carbon dioxide, which of these statements is false?

Accepted Answer

A)  18.0 g of carbon is needed to form 66.0 g of carbon dioxide. 
B)  48.0 g of oxygen is needed to form 66.0 g of carbon dioxide. 
C)  48.0 g of carbon is needed to form 132.0 g of carbon dioxide. 
D)  96.0 g of oxygen is needed to form 132.0 g of carbon dioxide. 
E)  36.0 g of carbon is needed to form 132.0 g of carbon dioxide. 
A)  18.0 g of carbon is needed to form 66.0 g of carbon dioxide. 
B)  48.0 g of oxygen is needed to form 66.0 g of carbon dioxide. 
C)  48.0 g of carbon is needed to form 132.0 g of carbon dioxide. 
D)  96.0 g of oxygen is needed to form 132.0 g of carbon dioxide. 
E)  36.0 g of carbon is needed to form 132.0 g of carbon dioxide.

Question 5

Which of the following laws best illustrates the following statement? Regardless of the amount of fluorine available, 23 g of sodium always combines with 19 g of fluorine.

Accepted Answer

A)  Law of Constant Composition 
B)  Law of Conservation of Mass 
C)  Dalton's Atomic Theory 
D)  Law of Mass Action 
E)  Lavoisier's Law 
A)  Law of Constant Composition 
B)  Law of Conservation of Mass 
C)  Dalton's Atomic Theory 
D)  Law of Mass Action 
E)  Lavoisier's Law

Question 6

A bowl of chocolate chip ice cream is best described as  a _____.

Accepted Answer

A)  pure substance containing only elements 
B)  homogenous mixture of elements 
C)  heterogeneous mixture compounds 
D)  pure substance containing only compounds 
E)  heterogeneous mixture of elements 
A)  pure substance containing only elements 
B)  homogenous mixture of elements 
C)  heterogeneous mixture compounds 
D)  pure substance containing only compounds 
E)  heterogeneous mixture of elements

Question 7

Which two scientists are credited with the endorsement of a sun-centered universe?

Accepted Answer

A)  Dalton and Plato 
B)  Boyle and Copernicus 
C)  Copernicus and Galileo 
D)  Democritus and Vesalius 
A)  Dalton and Plato 
B)  Boyle and Copernicus 
C)  Copernicus and Galileo 
D)  Democritus and Vesalius

Question 8

Which of the following scientists  is responsible for establishing the concept of a nuclear atom?

Accepted Answer

A)  Rutherford 
B)  Proust 
C)  Dalton 
D)  Lavoisier 
E)  Galileo 
A)  Rutherford 
B)  Proust 
C)  Dalton 
D)  Lavoisier 
E)  Galileo

Question 9

Which of these statements best explains the law of constant composition?

Accepted Answer

A)  All atoms of a given element have the same weight. 
B)  Atoms of different elements combine in fixed whole number ratios. 
C)  The weight of an object is neither created nor destroyed in a chemical reaction. 
D)  All samples of a given compound have the same proportion of constituent elements. 
E)  The sum of the masses of the reactants equals the sum of the masses of the products in a normal chemical reaction. 
A)  All atoms of a given element have the same weight. 
B)  Atoms of different elements combine in fixed whole number ratios. 
C)  The weight of an object is neither created nor destroyed in a chemical reaction. 
D)  All samples of a given compound have the same proportion of constituent elements. 
E)  The sum of the masses of the reactants equals the sum of the masses of the products in a normal chemical reaction.

Question 10

Which of the following statements is not true of a chemical compound ?

Accepted Answer

A)  A chemical compound is composed of two or more elements. 
B)  A chemical compound is a pure substance. 
C)  A chemical compound has a fixed composition. 
D)  A chemical compound has a variable composition. 
E)  The elements present in a compound are different from one another. 
A)  A chemical compound is composed of two or more elements. 
B)  A chemical compound is a pure substance. 
C)  A chemical compound has a fixed composition. 
D)  A chemical compound has a variable composition. 
E)  The elements present in a compound are different from one another.

Question 11

The smallest unit of a chemical compound is  a(n) _____.

Accepted Answer

A)  atom 
B)  molecule 
C)  beta particle 
D)  alpha particle 
E)  ion 
A)  atom 
B)  molecule 
C)  beta particle 
D)  alpha particle 
E)  ion

Question 12

Carbon and oxygen react to form carbon dioxide. What is the mass of carbon dioxide produced when 12.0 g of carbon react with 32.0 g of oxygen?

Accepted Answer

A)  44 g 
B)  38 g 
C)  28 g 
D)  20 g 
E)  2.67 g 
A)  44 g 
B)  38 g 
C)  28 g 
D)  20 g 
E)  2.67 g

Question 13

Which of these substances are compounds?
I. Neon
II. Crude oil
III. Water
IV. Sodium chloride

Accepted Answer

A)  I 
B)  I and III 
C)  II, III, and IV 
D)  III and IV 
E)  II and IV 
A)  I 
B)  I and III 
C)  II, III, and IV 
D)  III and IV 
E)  II and IV

Question 14

Which of these statements is true ?

Accepted Answer

A)  Gases are compressible and have a variable shape. 
B)  Gases are incompressible and have a variable shape. 
C)  Gases are compressible and have a fixed shape. 
D)  Gases are incompressible and have a fixed shape. 
E)  Gases are incompressible and can have a fixed or a variable shape. 
A)  Gases are compressible and have a variable shape. 
B)  Gases are incompressible and have a variable shape. 
C)  Gases are compressible and have a fixed shape. 
D)  Gases are incompressible and have a fixed shape. 
E)  Gases are incompressible and can have a fixed or a variable shape.

Question 15

The French chemist Antoine Lavoisier found that the weight of objects before burning and the weight of the products after burning were equal. He noticed that the total weight did not change during a process. Which of these best describes the scenario?

Accepted Answer

A)  Lavoisier arrived at  a scientific law from observation. 
B)  Lavoisier arrived at  a scientific theory from observation. . 
C)  Lavoisier arrived at  a scientific theory from a scientific law. 
D)  Lavoisier arrived at a scientific law from a scientific theory. 
E)  Lavoisier arrived at a scientific conclusion from observation. 
A)  Lavoisier arrived at  a scientific law from observation. 
B)  Lavoisier arrived at  a scientific theory from observation. . 
C)  Lavoisier arrived at  a scientific theory from a scientific law. 
D)  Lavoisier arrived at a scientific law from a scientific theory. 
E)  Lavoisier arrived at a scientific conclusion from observation.

Question 16

Which of these statements is true?

Accepted Answer

A)  The compositions of both mixtures and pure substances are variable. 
B)  The compositions of both mixtures and pure substances are fixed. 
C)  The composition of mixtures is variable, and the composition of pure substances is fixed. 
D)  The composition of mixtures is fixed, and the composition of pure substances is variable. 
E)  The compositions of both mixtures and pure substances can be fixed or variable. 
A)  The compositions of both mixtures and pure substances are variable. 
B)  The compositions of both mixtures and pure substances are fixed. 
C)  The composition of mixtures is variable, and the composition of pure substances is fixed. 
D)  The composition of mixtures is fixed, and the composition of pure substances is variable. 
E)  The compositions of both mixtures and pure substances can be fixed or variable.

Question 17

_____ proposed that if a substance could be broken down into simpler substances, it was not an element.

Accepted Answer

A)  Robert Boyle 
B)  Nicholas Copernicus 
C)  John Dalton 
D)  Andreas Vesalius 
E)  Galileo Galilei 
A)  Robert Boyle 
B)  Nicholas Copernicus 
C)  John Dalton 
D)  Andreas Vesalius 
E)  Galileo Galilei

Question 18

Which of these sets of masses for nitrogen dioxide is not consistent with the others according to the Law of Constant Composition?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 19

The scientific revolution of the 1500s was marked by a move away from _____ and towards _____ as a method for explaining the natural world.

Accepted Answer

A)  law; theory 
B)  alchemy; research 
C)  reason; observation 
D)  scientific theory; experimentation 
E)  observation; experimentation 
A)  law; theory 
B)  alchemy; research 
C)  reason; observation 
D)  scientific theory; experimentation 
E)  observation; experimentation

Question 20

Which of these statements about the scientific method is incorrect ?

Accepted Answer

A)  It is a collection of absolute truths. 
B)  It uses experiments that are reproducible. 
C)  It is used for testing claims about the natural world. 
D)  It requires one to propose a theory and perform experiments to obtain results that confirm or disclaim the theory. 
E)  It  leads to a model of reality from a set of observations. 
A)  It is a collection of absolute truths. 
B)  It uses experiments that are reproducible. 
C)  It is used for testing claims about the natural world. 
D)  It requires one to propose a theory and perform experiments to obtain results that confirm or disclaim the theory. 
E)  It  leads to a model of reality from a set of observations.

Which of these are pure substances? I. Steam II. Crude oil III. Salt water IV. Gun powder V. Oxygen VI. Mercury

Identify the entities that will correctly complete the flow chart.

A substance composed of two or more different elements in fixed proportions is known as a(n) _____.

If 12.0 g of carbon react with 32.0 g of oxygen to form 44.0 g of carbon dioxide, which of these statements is false?

Which of the following laws best illustrates the following statement? Regardless of the amount of fluorine available, 23 g of sodium always combines with 19 g of fluorine.

A bowl of chocolate chip ice cream is best described as a _____.

Which two scientists are credited with the endorsement of a sun-centered universe?

Which of the following scientists is responsible for establishing the concept of a nuclear atom?

Which of these statements best explains the law of constant composition?

Which of the following statements is not true of a chemical compound ?

The smallest unit of a chemical compound is a(n) _____.

Carbon and oxygen react to form carbon dioxide. What is the mass of carbon dioxide produced when 12.0 g of carbon react with 32.0 g of oxygen?

Which of these substances are compounds? I. Neon II. Crude oil III. Water IV. Sodium chloride

Which of these statements is true ?

The French chemist Antoine Lavoisier found that the weight of objects before burning and the weight of the products after burning were equal. He noticed that the total weight did not change during a process. Which of these best describes the scenario?

Which of these statements is true?

_____ proposed that if a substance could be broken down into simpler substances, it was not an element.

Which of these sets of masses for nitrogen dioxide is not consistent with the others according to the Law of Constant Composition?

The scientific revolution of the 1500s was marked by a move away from _ and towards _ as a method for explaining the natural world.

Which of these statements about the scientific method is incorrect ?

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Exam 1: Molecular Reasons

Which of these are pure substances? I. Steam II. Crude oil III. Salt water IV. Gun powder V. Oxygen VI. Mercury

Identify the entities that will correctly complete the flow chart.

A substance composed of two or more different elements in fixed proportions is known as a(n) _____.

If 12.0 g of carbon react with 32.0 g of oxygen to form 44.0 g of carbon dioxide, which of these statements is false?

Which of the following laws best illustrates the following statement? Regardless of the amount of fluorine available, 23 g of sodium always combines with 19 g of fluorine.

A bowl of chocolate chip ice cream is best described as a _____.

Which two scientists are credited with the endorsement of a sun-centered universe?

Which of the following scientists is responsible for establishing the concept of a nuclear atom?

Which of these statements best explains the law of constant composition?

Which of the following statements is not true of a chemical compound ?

The smallest unit of a chemical compound is a(n) _____.

Carbon and oxygen react to form carbon dioxide. What is the mass of carbon dioxide produced when 12.0 g of carbon react with 32.0 g of oxygen?

Which of these substances are compounds? I. Neon II. Crude oil III. Water IV. Sodium chloride

Which of these statements is true ?

The French chemist Antoine Lavoisier found that the weight of objects before burning and the weight of the products after burning were equal. He noticed that the total weight did not change during a process. Which of these best describes the scenario?

Which of these statements is true?

_____ proposed that if a substance could be broken down into simpler substances, it was not an element.

Which of these sets of masses for nitrogen dioxide is not consistent with the others according to the Law of Constant Composition?

The scientific revolution of the 1500s was marked by a move away from _____ and towards _____ as a method for explaining the natural world.

Which of these statements about the scientific method is incorrect ?

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology Online Only

Filters

The scientific revolution of the 1500s was marked by a move away from _ and towards _ as a method for explaining the natural world.