Question 1

Thales believed that _____ is the principle element of all things.

Accepted Answer

A)  earth 
B)  air 
C)  fire 
D)  water 
E)  gold 
A)  earth 
B)  air 
C)  fire 
D)  water 
E)  gold

Question 2

Which of these statements about science is incorrect ?

Accepted Answer

A)  Science influences culture and society. 
B)  Science reveals knowledge not attainable by other means. 
C)  Science is a fundamental way to understand the world around us. 
D)  Decisions involving scientific principles are often made by nonscientists. 
E)  All of these are incorrect statements. 
A)  Science influences culture and society. 
B)  Science reveals knowledge not attainable by other means. 
C)  Science is a fundamental way to understand the world around us. 
D)  Decisions involving scientific principles are often made by nonscientists. 
E)  All of these are incorrect statements.

Question 3

Which of these contributions did alchemists of the Middle Ages make to modern science?

Accepted Answer

A)  Sun-centered universe and metallurgy 
B)  Metallurgy and the development of scientific techniques 
C)  The scientific method and law of conservation of mass 
D)  Law of conservation of matter and first atomic theory 
E)  Law of conservation of mass and law of constant composition 
A)  Sun-centered universe and metallurgy 
B)  Metallurgy and the development of scientific techniques 
C)  The scientific method and law of conservation of mass 
D)  Law of conservation of matter and first atomic theory 
E)  Law of conservation of mass and law of constant composition

Question 4

Methane can be decomposed into two simpler substances: hydrogen and carbon. Therefore, methane  is a(n) _____.

Accepted Answer

A)  mixture 
B)  element 
C)  atom 
D)  compound. 
E)  molecule 
A)  mixture 
B)  element 
C)  atom 
D)  compound. 
E)  molecule

Question 5

Which of the following is expressed by the law of constant composition?

Accepted Answer

A)  All matter is composed of indivisible particles called atoms that cannot be created or destroyed. 
B)  All samples of a given compound have the same proportions as their constituent elements. 
C)  The atom consists of a sphere of positive charge filled with tiny negatively charged particles called electrons. 
D)  Most of the volume of the atom is empty space occupied by tiny negatively charged electrons. 
E)  In a chemical reaction, matter is neither created nor destroyed. 
A)  All matter is composed of indivisible particles called atoms that cannot be created or destroyed. 
B)  All samples of a given compound have the same proportions as their constituent elements. 
C)  The atom consists of a sphere of positive charge filled with tiny negatively charged particles called electrons. 
D)  Most of the volume of the atom is empty space occupied by tiny negatively charged electrons. 
E)  In a chemical reaction, matter is neither created nor destroyed.

Question 6

Analysis of a silicon dioxide (SiO2) sample indicated it contained 46.75 g of silicon and 53.25 g of oxygen. Determine the mass of silicon in a sample of SiO2 if the mass of oxygen is 21.3 g.

Accepted Answer

A)  116.9 g 
B)  24.26 
C)  18.7 g 
D)  9.70 g 
E)  2.67 g 
A)  116.9 g 
B)  24.26 
C)  18.7 g 
D)  9.70 g 
E)  2.67 g

Question 7

A sample of heptane always contains 84% carbon and 16% hydrogen. Which of these best explains this phenomena?

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 8

What does the figure represent?
​

Accepted Answer

A)  A heterogeneous mixture of elements 
B)  A pure substance that is an element 
C)  A pure substance that is a compound 
D)  A homogenous mixture of elements and compounds 
E)  A heterogeneous mixture of elements and compounds 
A)  A heterogeneous mixture of elements 
B)  A pure substance that is an element 
C)  A pure substance that is a compound 
D)  A homogenous mixture of elements and compounds 
E)  A heterogeneous mixture of elements and compounds

Question 9

Which of these is not part of the scientific method?

Accepted Answer

A)  Observation 
B)  Law 
C)  Theory 
D)  Conclusion 
E)  Experiment 
A)  Observation 
B)  Law 
C)  Theory 
D)  Conclusion 
E)  Experiment

Question 10

The simplest form of a substance is known as a(n) _____.

Accepted Answer

A)  element 
B)  ion 
C)  mixture 
D)  nucleus 
E)  compound 
A)  element 
B)  ion 
C)  mixture 
D)  nucleus 
E)  compound

Question 11

Which scientist is incorrectly matched with his idea or theory?

Accepted Answer

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

Question 12

A chocolate chip cookie is an example of a(n) _____.

Accepted Answer

A)  element 
B)  compound 
C)  homogeneous mixture 
D)  heterogeneous mixture 
E)  alpha particle 
A)  element 
B)  compound 
C)  homogeneous mixture 
D)  heterogeneous mixture 
E)  alpha particle

Question 13

Which scientist is incorrectly matched with his idea or theory?

Accepted Answer

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

Question 14

Which of the following scientists is responsible for establishing the law of conservation of mass?

Accepted Answer

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

Question 15

Analysis of a sodium chloride (NaCl) sample indicated that it contained 15 g of sodium and 23.1 g of chlorine. Determine the mass of chlorine in a sample of NaCl if the mass of sodium is 45.0 g.

Accepted Answer

A)  29.2 g 
B)  60.0 g 
C)  68.1 g 
D)  69.3 g 
E)  83.1 g 
A)  29.2 g 
B)  60.0 g 
C)  68.1 g 
D)  69.3 g 
E)  83.1 g

Question 16

During the scientific revolution, _____ portrayed human anatomy with unprecedented accuracy.

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 17

2.0 g of hydrogen react with 16.0 g of oxygen to form 18.0 g of water. If 3.0 g of hydrogen reacts with 16.0 g of oxygen, which of the following is true?

Accepted Answer

A)  18.0 g of water will form with 1.0 g of excess oxygen. 
B)  18.0 g of water will form with 1.0 g of excess hydrogen. 
C)  19.0 g of water will form. 
D)  17.0 g of water will form with 1.0 g of excess oxygen and 1.0 g of excess hydrogen. 
E)  None of these are correct. 
A)  18.0 g of water will form with 1.0 g of excess oxygen. 
B)  18.0 g of water will form with 1.0 g of excess hydrogen. 
C)  19.0 g of water will form. 
D)  17.0 g of water will form with 1.0 g of excess oxygen and 1.0 g of excess hydrogen. 
E)  None of these are correct.

Question 18

What does the figure represent?
​

Accepted Answer

A)  A heterogeneous mixture of elements 
B)  A pure substance that is an element 
C)  A pure substance that is a compound 
D)  A homogenous mixture of elements and compounds 
E)  A heterogeneous mixture of elements and compounds 
A)  A heterogeneous mixture of elements 
B)  A pure substance that is an element 
C)  A pure substance that is a compound 
D)  A homogenous mixture of elements and compounds 
E)  A heterogeneous mixture of elements and compounds

Question 19

Which of these is true of matter?

Accepted Answer

A)  It is the pull of gravity on an object. 
B)  It combines to form atoms. 
C)  It is neither created nor destroyed during a chemical reaction. 
D)  It is directly proportional to weight. 
E)  It is the measure of space occupied by an object . 
A)  It is the pull of gravity on an object. 
B)  It combines to form atoms. 
C)  It is neither created nor destroyed during a chemical reaction. 
D)  It is directly proportional to weight. 
E)  It is the measure of space occupied by an object .

Question 20

Which of the following scientists is responsible for establishing the law of constant composition?

Accepted Answer

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

Thales believed that _____ is the principle element of all things.

Which of these statements about science is incorrect ?

Which of these contributions did alchemists of the Middle Ages make to modern science?

Methane can be decomposed into two simpler substances: hydrogen and carbon. Therefore, methane is a(n) _____.

Which of the following is expressed by the law of constant composition?

Analysis of a silicon dioxide (SiO₂) sample indicated it contained 46.75 g of silicon and 53.25 g of oxygen. Determine the mass of silicon in a sample of SiO₂ if the mass of oxygen is 21.3 g.

A sample of heptane always contains 84% carbon and 16% hydrogen. Which of these best explains this phenomena?

What does the figure represent?

Which of these is not part of the scientific method?

The simplest form of a substance is known as a(n) _____.

Which scientist is incorrectly matched with his idea or theory?

A chocolate chip cookie is an example of a(n) _____.

Which scientist is incorrectly matched with his idea or theory?

Which of the following scientists is responsible for establishing the law of conservation of mass?

Analysis of a sodium chloride (NaCl) sample indicated that it contained 15 g of sodium and 23.1 g of chlorine. Determine the mass of chlorine in a sample of NaCl if the mass of sodium is 45.0 g.

During the scientific revolution, _____ portrayed human anatomy with unprecedented accuracy.

2.0 g of hydrogen react with 16.0 g of oxygen to form 18.0 g of water. If 3.0 g of hydrogen reacts with 16.0 g of oxygen, which of the following is true?

What does the figure represent?

Which of these is true of matter?

Which of the following scientists is responsible for establishing the law of constant composition?

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Exam 1: Molecular Reasons

Thales believed that _____ is the principle element of all things.

Which of these statements about science is incorrect ?

Which of these contributions did alchemists of the Middle Ages make to modern science?

Methane can be decomposed into two simpler substances: hydrogen and carbon. Therefore, methane is a(n) _____.

Which of the following is expressed by the law of constant composition?

Analysis of a silicon dioxide (SiO2) sample indicated it contained 46.75 g of silicon and 53.25 g of oxygen. Determine the mass of silicon in a sample of SiO2 if the mass of oxygen is 21.3 g.

A sample of heptane always contains 84% carbon and 16% hydrogen. Which of these best explains this phenomena?

What does the figure represent? ​

Which of these is not part of the scientific method?

The simplest form of a substance is known as a(n) _____.

Which scientist is incorrectly matched with his idea or theory?

A chocolate chip cookie is an example of a(n) _____.

Which scientist is incorrectly matched with his idea or theory?

Which of the following scientists is responsible for establishing the law of conservation of mass?

Analysis of a sodium chloride (NaCl) sample indicated that it contained 15 g of sodium and 23.1 g of chlorine. Determine the mass of chlorine in a sample of NaCl if the mass of sodium is 45.0 g.

During the scientific revolution, _____ portrayed human anatomy with unprecedented accuracy.

2.0 g of hydrogen react with 16.0 g of oxygen to form 18.0 g of water. If 3.0 g of hydrogen reacts with 16.0 g of oxygen, which of the following is true?

What does the figure represent? ​

Which of these is true of matter?

Which of the following scientists is responsible for establishing the law of constant composition?

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

Analysis of a silicon dioxide (SiO₂) sample indicated it contained 46.75 g of silicon and 53.25 g of oxygen. Determine the mass of silicon in a sample of SiO₂ if the mass of oxygen is 21.3 g.

What does the figure represent?

What does the figure represent?