Question 1

Which scientist 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

Question 2

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

Accepted Answer

A) From observation, Lavoisier created a scientific law. 
B) From observation, Lavoisier created a scientific theory. 
C) From scientific law, Lavoisier created a scientific theory. 
D) From experimentation, Lavoisier created a scientific law. 
E) From observation, Lavoisier created a scientific conclusion. 
A) From observation, Lavoisier created a scientific law. 
B) From observation, Lavoisier created a scientific theory. 
C) From scientific law, Lavoisier created a scientific theory. 
D) From experimentation, Lavoisier created a scientific law. 
E) From observation, Lavoisier created a scientific conclusion.

Question 3

Which of these statements is true?

Accepted Answer

A) The composition of both mixtures and pure substances is variable. 
B) The composition of both mixtures and pure substances is 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 composition of both mixtures and pure substances can be fixed or variable. 
A) The composition of both mixtures and pure substances is variable. 
B) The composition of both mixtures and pure substances is 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 composition of both mixtures and pure substances can be fixed or variable.

Question 4

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and60% Z by mass. Which statement best explains the outcome when 100 g of A is mixed with 100 g of Z?

Accepted Answer

A) The reaction will form 200 g of AZ. 
B) The reaction will form 100 g of AZ. 
C) After all possible AZ is formed, some Z will be left over. 
D) After all possible AZ is formed, some A will be left over. 
E) No reaction will occur since the reactants are in the wrong ratio. 
A) The reaction will form 200 g of AZ. 
B) The reaction will form 100 g of AZ. 
C) After all possible AZ is formed, some Z will be left over. 
D) After all possible AZ is formed, some A will be left over. 
E) No reaction will occur since the reactants are in the wrong ratio.

Question 5

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 correct 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 correct statements.

Question 6

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

Accepted Answer

A) Proton 
B) Neutron 
C) Electron 
D) Both A and B 
E) None of these 
A) Proton 
B) Neutron 
C) Electron 
D) Both A and B 
E) None of these

Question 7

Identify the entities which 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 8

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 9

Which of these statements is true?

Accepted Answer

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

Question 10

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 is reacted 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 the above is 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 the above is correct.

Question 11

Which scientist first theorized that matter was ultimately composed of small indivisible particles called atoms?

Accepted Answer

A) Dalton 
B) Lavoisier 
C) Empedocles 
D) Plato 
E) Democritus 
A) Dalton 
B) Lavoisier 
C) Empedocles 
D) Plato 
E) Democritus

Question 12

A college freshman reports to Student Health Services on campus complaining 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 what step 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

Question 13

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) Neither a physical nor chemical change occurs. 
A) A physical change occurs. 
B) A chemical change occurs. 
C) Both physical and chemical changes occur. 
D) Neither a physical nor chemical change occurs.

Question 14

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 15

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 16

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 17

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

Accepted Answer

A) Glass breaking 
B) Water freezing 
C) Wood burning 
D) Getting a haircut 
A) Glass breaking 
B) Water freezing 
C) Wood burning 
D) Getting a haircut

Question 18

A statement which summarizes the data obtained from a series of observations is known as a(n)____.

Accepted Answer

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

Question 19

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 20

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

Accepted Answer

A) is a gas. 
B) is an element. 
C) is a mixture. 
D) is a compound. 
E) must have the formula CH. 
A) is a gas. 
B) is an element. 
C) is a mixture. 
D) is a compound. 
E) must have the formula CH.

Which scientist is responsible for establishing the Law of Constant Composition?

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

Which of these statements is true?

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and60% Z by mass. Which statement best explains the outcome when 100 g of A is mixed with 100 g of Z?

Which of these statements about science is incorrect ?

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

Identify the entities which will correctly complete the flow chart.

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

Which of these statements is true?

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 is reacted with 16.0 g of oxygen, which of the following is true?

Which scientist first theorized that matter was ultimately composed of small indivisible particles called atoms?

A college freshman reports to Student Health Services on campus complaining 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 what step in the scientific method?

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

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

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

Which of these statements best explains the Law of Conservation of Mass?

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

A statement which summarizes the data obtained from a series of observations is known as a(n)____.

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

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

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Exam 1: Molecular Reasons

Which scientist is responsible for establishing the Law of Constant Composition?

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

Which of these statements is true?

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and60% Z by mass. Which statement best explains the outcome when 100 g of A is mixed with 100 g of Z?

Which of these statements about science is incorrect ?

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

Identify the entities which will correctly complete the flow chart.

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

Which of these statements is true?

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 is reacted with 16.0 g of oxygen, which of the following is true?

Which scientist first theorized that matter was ultimately composed of small indivisible particles called atoms?

A college freshman reports to Student Health Services on campus complaining 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 what step in the scientific method?

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

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

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

Which of these statements best explains the Law of Conservation of Mass?

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

A statement which summarizes the data obtained from a series of observations is known as a(n)____.

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

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

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

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