Question 1

Which of these statements is not consistent with Dalton's atomic theory?

Accepted Answer

A)  All atoms of gold have the same chemical properties. 
B)  Electrons are equally distributed throughout an atom. 
C)  The properties of sodium are different from the properties of chlorine. 
D)  Compounds are formed when atoms combine in simple whole number ratios. 
E)  Atoms are rearranged in normal chemical reactions but are neither created nor destroyed. 
A)  All atoms of gold have the same chemical properties. 
B)  Electrons are equally distributed throughout an atom. 
C)  The properties of sodium are different from the properties of chlorine. 
D)  Compounds are formed when atoms combine in simple whole number ratios. 
E)  Atoms are rearranged in normal chemical reactions but are neither created nor destroyed. B

Question 2

A college freshman complains to Student Health Services of a soar throat and fever. The doctor swabs the back of the student's throat and begins a throat culture. The swabbing and growing of a culture is an example of a(n) _____ in the scientific method?

Accepted Answer

A)  law 
B)  theory 
C)  conclusion 
D)  observation 
E)  experimentation 
A)  law 
B)  theory 
C)  conclusion 
D)  observation 
E)  experimentation E

Question 3

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. D

Question 4

A(n) _____ is an explanation of a scientific observation.

Accepted Answer

A)  speculation 
B)  theory 
C)  conclusion 
D)  prediction 
E)  epiphany 
A)  speculation 
B)  theory 
C)  conclusion 
D)  prediction 
E)  epiphany

Question 5

_____ is known as the predecessor to chemistry.

Accepted Answer

A)  Alchemy 
B)  Pre-chemistry 
C)  Biology 
D)  Biochemistry 
E)  Physical science 
A)  Alchemy 
B)  Pre-chemistry 
C)  Biology 
D)  Biochemistry 
E)  Physical science

Question 6

Which of the following scientists 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

Question 7

Which of the following is not true of Rutherford's nuclear theory of an atom?

Accepted Answer

A)  The nucleus contains most of the mass of the atom. 
B)  The nucleus contains all the positive charge of an atom. 
C)  The number of electrons outside the nucleus is equal to the number of positively charged units inside the nucleus of an atom. 
D)  Tiny negatively charged electrons occupy most of the volume of an atom. 
E)  An atom consists of a sphere of positive charge filled with tiny negatively charged particles called electrons. 
A)  The nucleus contains most of the mass of the atom. 
B)  The nucleus contains all the positive charge of an atom. 
C)  The number of electrons outside the nucleus is equal to the number of positively charged units inside the nucleus of an atom. 
D)  Tiny negatively charged electrons occupy most of the volume of an atom. 
E)  An atom consists of a sphere of positive charge filled with tiny negatively charged particles called electrons.

Question 8

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)  The atoms of one element are different from the atoms of another element. 
E)  Atoms of different types can combine to form compounds. 
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)  The atoms of one element are different from the atoms of another element. 
E)  Atoms of different types can combine to form compounds.

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

Which of the following is an example of a chemical change?

Accepted Answer

A)  Glass breaking 
B)  Water freezing 
C)  Wood burning 
D)  Alcohol vaporizing 
E)  Ice melting 
A)  Glass breaking 
B)  Water freezing 
C)  Wood burning 
D)  Alcohol vaporizing 
E)  Ice melting

Question 11

Which of these subatomic particles is not found in the nucleus of an atom?

Accepted Answer

A)  Proton 
B)  Neutron 
C)  Electron 
D)  Alpha particle 
E)  Beta particle 
A)  Proton 
B)  Neutron 
C)  Electron 
D)  Alpha particle 
E)  Beta particle

Question 12

Which of these statements best explains the law of conservation of mass ?

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 any 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 any normal chemical reaction.

Question 13

Based on Rutherford's model of the atom, how many protons would be found in an atom with 17 electrons?

Accepted Answer

A)  1 
B)  7 
C)  12 
D)  17 
E)  34 
A)  1 
B)  7 
C)  12 
D)  17 
E)  34

Question 14

To explain natural phenomena, scientists must _____.

Accepted Answer

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

Question 15

Which of these statements is true?

Accepted Answer

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

Question 16

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

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 observations and laws 
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 observations and laws

Question 17

Which of the following is true of ice when it melts to form liquid water?

Accepted Answer

A)  A physical change occurs. 
B)  A chemical change occurs. 
C)  Both physical and chemical changes occur. 
D)  The number of molecules of water increases. 
E)  The number of molecules of water decreases. 
A)  A physical change occurs. 
B)  A chemical change occurs. 
C)  Both physical and chemical changes occur. 
D)  The number of molecules of water increases. 
E)  The number of molecules of water decreases.

Question 18

Which two subatomic particles comprise 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 19

Based on Rutherford's model of the atom, how many electrons would be found in an atom with 7 protons?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  7 
E)  14 
A)  1 
B)  2 
C)  4 
D)  7 
E)  14

Question 20

Which of the following is a characteristic of the nucleus of an atom?

Accepted Answer

A)  It is negatively charged. 
B)  It is neutrally charged. 
C)  It accounts for most of the volume of the atom. 
D)  It contains an atom's protons and electrons. 
E)  It accounts for most of the mass of the atom. 
A)  It is negatively charged. 
B)  It is neutrally charged. 
C)  It accounts for most of the volume of the atom. 
D)  It contains an atom's protons and electrons. 
E)  It accounts for most of the mass of the atom.

Which of these statements is not consistent with Dalton's atomic theory?

A college freshman complains to Student Health Services of a soar throat and fever. The doctor swabs the back of the student's throat and begins a throat culture. The swabbing and growing of a culture is an example of a(n) _____ in the scientific method?

Which scientist is incorrectly matched with his idea or theory?

A(n) _____ is an explanation of a scientific observation.

_____ is known as the predecessor to chemistry.

Which of the following scientists is responsible for establishing the early atomic theory using the laws of conservation of mass and other related laws and observations?

Which of the following is not true of Rutherford's nuclear theory of an atom?

Which of these statements is not correct according to Dalton's atomic theory?

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

Which of the following is an example of a chemical change?

Which of these subatomic particles is not found in the nucleus of an atom?

Which of these statements best explains the law of conservation of mass ?

Based on Rutherford's model of the atom, how many protons would be found in an atom with 17 electrons?

To explain natural phenomena, scientists must _____.

Which of these statements is true?

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

Which of the following is true of ice when it melts to form liquid water?

Which two subatomic particles comprise the nucleus of an atom?

Based on Rutherford's model of the atom, how many electrons would be found in an atom with 7 protons?

Which of the following is a characteristic of the nucleus of an atom?

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Exam 1: Molecular Reasons

Which of these statements is not consistent with Dalton's atomic theory?

A college freshman complains to Student Health Services of a soar throat and fever. The doctor swabs the back of the student's throat and begins a throat culture. The swabbing and growing of a culture is an example of a(n) _____ in the scientific method?

Which scientist is incorrectly matched with his idea or theory?

A(n) _____ is an explanation of a scientific observation.

_____ is known as the predecessor to chemistry.

Which of the following scientists is responsible for establishing the early atomic theory using the laws of conservation of mass and other related laws and observations?

Which of the following is not true of Rutherford's nuclear theory of an atom?

Which of these statements is not correct according to Dalton's atomic theory?

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

Which of the following is an example of a chemical change?

Which of these subatomic particles is not found in the nucleus of an atom?

Which of these statements best explains the law of conservation of mass ?

Based on Rutherford's model of the atom, how many protons would be found in an atom with 17 electrons?

To explain natural phenomena, scientists must _____.

Which of these statements is true?

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

Which of the following is true of ice when it melts to form liquid water?

Which two subatomic particles comprise the nucleus of an atom?

Based on Rutherford's model of the atom, how many electrons would be found in an atom with 7 protons?

Which of the following is a characteristic of the nucleus of an atom?

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