Question 1

To explain natural phenomena scientists must _____.

Accepted Answer

A) have an opinion 
B) make observations 
C) guess correctly most of the time 
D) agree with existing theories 
A) have an opinion 
B) make observations 
C) guess correctly most of the time 
D) agree with existing theories B

Question 2

Which scientist is responsible for establishing the early atomic theory using the laws of Conservation of Mass and other related laws and observations?

Accepted Answer

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

Question 3

Carbon and oxygen react to form carbon dioxide. What mass of carbon dioxide is 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 A

Question 4

Which two subatomic particles compose the nucleus of an atom?

Accepted Answer

A) Protons, neutrons 
B) Protons, electrons 
C) Electrons, neutrons 
D) Alpha particles, protons 
E) Alpha particles, electrons 
A) Protons, neutrons 
B) Protons, electrons 
C) Electrons, neutrons 
D) Alpha particles, protons 
E) Alpha particles, electrons

Question 5

Which of these is not a requirement of a scientifically acceptable theory?

Accepted Answer

A) Good predictive power of the theory 
B) Proven by additional experimentation 
C) Sound reasoning for a particular observation 
D) Easily revised to accommodate new observations 
E) Provides model of behavior consistent with other widely accepted theories 
A) Good predictive power of the theory 
B) Proven by additional experimentation 
C) Sound reasoning for a particular observation 
D) Easily revised to accommodate new observations 
E) Provides model of behavior consistent with other widely accepted theories

Question 6

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

Question 7

Which of these statements is true ?

Accepted Answer

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

Question 8

Which of these substances are heterogeneous mixtures?
I. Steam
II. Milk of magnesia
III. Crude oil
IV. Rubbing alcohol"

Accepted Answer

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

Question 9

Which of these is the best definition of a scientific law?

Accepted Answer

A) A prediction based on a limited number of observations. 
B) A method of explaining observations that appear contradictory. 
C) A broadly applicable generalization with virtually no exceptions. 
D) A method for approaching problems that is used by all scientists. 
E) A rule made by scientists to ensure consistency in their observations. 
A) A prediction based on a limited number of observations. 
B) A method of explaining observations that appear contradictory. 
C) A broadly applicable generalization with virtually no exceptions. 
D) A method for approaching problems that is used by all scientists. 
E) A rule made by scientists to ensure consistency in their observations.

Question 10

When using the scientific method, before experiments are done a ___________ should be established.

Accepted Answer

A) hypothesis 
B) law 
C) theory 
D) conclusion 
A) hypothesis 
B) law 
C) theory 
D) conclusion

Question 11

A bowl of chocolate chip ice cream is best described as

Accepted Answer

A) a pure substance. 
B) a homogenous mixture. 
C) a heterogeneous mixture. 
D) a compound which is a pure substance. 
E) a chemical reaction between chocolate and vanilla ice cream. 
A) a pure substance. 
B) a homogenous mixture. 
C) a heterogeneous mixture. 
D) a compound which is a pure substance. 
E) a chemical reaction between chocolate and vanilla ice cream.

Question 12

Which of these statements is not correct according to Dalton's Atomic Theory?

Accepted Answer

A) Elements combine in fixed proportions to form compounds. 
B) Atoms are converted into other atoms in a chemical reaction. 
C) All matter is composed of small indivisible particles called atoms. 
D) Atoms of one element are different from atoms of another element. 
E) All of these statements are correct according to Dalton's Atomic Theory. 
A) Elements combine in fixed proportions to form compounds. 
B) Atoms are converted into other atoms in a chemical reaction. 
C) All matter is composed of small indivisible particles called atoms. 
D) Atoms of one element are different from atoms of another element. 
E) All of these statements are correct according to Dalton's Atomic Theory.

Question 13

Which of these statements about the scientific method is incorrect ?

Accepted Answer

A) It is a group 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 give results which confirm or disclaim the theory. 
E) All of these are correct statements. 
A) It is a group 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 give results which confirm or disclaim the theory. 
E) All of these are correct statements.

Question 14

Which scientist 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 15

Which of these statements is correct ?

Accepted Answer

A) The amount of carbon on earth is essentially constant. 
B) The amount of carbon on earth fluctuates with the seasons. 
C) The amount of carbon on earth is increasing due to plant and animal growth. 
D) The amount of carbon on earth is decreasing due to consumption of carbon based fuels. 
E) Both B and C are correct. 
A) The amount of carbon on earth is essentially constant. 
B) The amount of carbon on earth fluctuates with the seasons. 
C) The amount of carbon on earth is increasing due to plant and animal growth. 
D) The amount of carbon on earth is decreasing due to consumption of carbon based fuels. 
E) Both B and C are correct.

Question 16

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

Accepted Answer

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

Question 17

Which of these is the best definition of a scientific theory?

Accepted Answer

A) A prediction based on a limited number of observations. 
B) A method of explaining observations that appears contradictory. 
C) A broadly applicable generalization with virtually no exceptions. 
D) A method for approaching problems that is used by all scientists. 
E) A tentative model that describes the underlying cause of a physical behavior. 
A) A prediction based on a limited number of observations. 
B) A method of explaining observations that appears contradictory. 
C) A broadly applicable generalization with virtually no exceptions. 
D) A method for approaching problems that is used by all scientists. 
E) A tentative model that describes the underlying cause of a physical behavior.

Question 18

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 19

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

Accepted Answer

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

Question 20

The smallest unit of a chemical compound is

Accepted Answer

A) an atom. 
B) a molecule. 
C) a nucleus. 
D) an alpha particle. 
E) None of the above are true. 
A) an atom. 
B) a molecule. 
C) a nucleus. 
D) an alpha particle. 
E) None of the above are true.

To explain natural phenomena scientists must _____.

Which scientist is responsible for establishing the early atomic theory using the laws of Conservation of Mass and other related laws and observations?

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

Which two subatomic particles compose the nucleus of an atom?

Which of these is not a requirement of a scientifically acceptable theory?

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

Which of these statements is true ?

Which of these substances are heterogeneous mixtures? I. Steam II. Milk of magnesia III. Crude oil IV. Rubbing alcohol"

Which of these is the best definition of a scientific law?

When using the scientific method, before experiments are done a ___________ should be established.

A bowl of chocolate chip ice cream is best described as

Which of these statements is not correct according to Dalton's Atomic Theory?

Which of these statements about the scientific method is incorrect ?

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

Which of these statements is correct ?

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

Which of these is the best definition of a scientific theory?

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.

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

The smallest unit of a chemical compound is

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

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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

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Exam 1: Molecular Reasons

To explain natural phenomena scientists must _____.

Which scientist is responsible for establishing the early atomic theory using the laws of Conservation of Mass and other related laws and observations?

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

Which two subatomic particles compose the nucleus of an atom?

Which of these is not a requirement of a scientifically acceptable theory?

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

Which of these statements is true ?

Which of these substances are heterogeneous mixtures? I. Steam II. Milk of magnesia III. Crude oil IV. Rubbing alcohol"

Which of these is the best definition of a scientific law?

When using the scientific method, before experiments are done a ___________ should be established.

A bowl of chocolate chip ice cream is best described as

Which of these statements is not correct according to Dalton's Atomic Theory?

Which of these statements about the scientific method is incorrect ?

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

Which of these statements is correct ?

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

Which of these is the best definition of a scientific theory?

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.

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

The smallest unit of a chemical compound is

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

Filters