Question 1

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 2

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 because of  plant and animal growth. 
D)  The amount of carbon on Earth is decreasing because of the  consumption of carbon-based fuels. 
E)  All of these 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 because of  plant and animal growth. 
D)  The amount of carbon on Earth is decreasing because of the  consumption of carbon-based fuels. 
E)  All of these are correct.

Question 3

Which of the following statements is correct?

Accepted Answer

A)  A pure substance is not a compound. 
B)  A pure substance is a combination of two elements in variable proportions. 
C)  A mixture is a combination of two or more pure substances in definite proportions. 
D)  A mixture cannot be composed of two or more compounds. 
E)  A pure substance is either an element or a compound. 
A)  A pure substance is not a compound. 
B)  A pure substance is a combination of two elements in variable proportions. 
C)  A mixture is a combination of two or more pure substances in definite proportions. 
D)  A mixture cannot be composed of two or more compounds. 
E)  A pure substance is either an element or a compound.

Question 4

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 5

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 6

A statement that 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 7

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

Accepted Answer

A)  It should predict behavior far beyond the observations from which it was formulated. 
B)  It should be proven by additional experimentation. 
C)  It should provide a sound reasoning for a particular observation. 
D)  It should be easy to revise to accommodate new observations. 
E)  It should provide models of behavior consistent with other widely accepted theories. 
A)  It should predict behavior far beyond the observations from which it was formulated. 
B)  It should be proven by additional experimentation. 
C)  It should provide a sound reasoning for a particular observation. 
D)  It should be easy to revise to accommodate new observations. 
E)  It should provide models of behavior consistent with other widely accepted theories.

Question 8

10.00 g of the chemical compound benzene (C6H6) contains 0.77 g of hydrogen and 9.23 g of carbon. What mass of benzene will contain 10.00 g of hydrogen?

Accepted Answer

A)  129.9 g 
B)  0.77 g 
C)  92.3 g 
D)  77.0 g 
E)  None of these 
A)  129.9 g 
B)  0.77 g 
C)  92.3 g 
D)  77.0 g 
E)  None of these

Question 9

In a scientific method, a hypothesis is tested by a(n) _____.

Accepted Answer

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

Question 10

Methane and oxygen react to form carbon dioxide and water. What is the mass of water formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?

Accepted Answer

A)  7.2 g 
B)  8.8 g 
C)  9.6 g 
D)  14.8 g 
E)  16.0 g 
A)  7.2 g 
B)  8.8 g 
C)  9.6 g 
D)  14.8 g 
E)  16.0 g

Question 11

Which of these statements is incorrect according to Rutherford's model of the atom?

Accepted Answer

A)  Neutrons are part of the nucleus. 
B)  Most of the volume of an atom is empty space. 
C)  A neutral atom contains an equal number of protons and electrons. 
D)  An electron is located close to the nucleus of an atom. 
E)  Most of the mass of the atom is concentrated in the nucleus. 
A)  Neutrons are part of the nucleus. 
B)  Most of the volume of an atom is empty space. 
C)  A neutral atom contains an equal number of protons and electrons. 
D)  An electron is located close to the nucleus of an atom. 
E)  Most of the mass of the atom is concentrated in the nucleus.

Question 12

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and 60% Z by mass. Which statement best explains the outcome  of mixing  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.

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

Which of these statements is correct ?

Which of the following statements is correct?

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

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

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

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

10.00 g of the chemical compound benzene (C₆H₆) contains 0.77 g of hydrogen and 9.23 g of carbon. What mass of benzene will contain 10.00 g of hydrogen?

In a scientific method, a hypothesis is tested by a(n) _____.

Methane and oxygen react to form carbon dioxide and water. What is the mass of water formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?

Which of these statements is incorrect according to Rutherford's model of the atom?

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and 60% Z by mass. Which statement best explains the outcome of mixing 100 g of A is mixed with 100 g of Z?

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Exam 1: Molecular Reasons

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

Which of these statements is correct ?

Which of the following statements is correct?

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

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

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

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

10.00 g of the chemical compound benzene (C6H6) contains 0.77 g of hydrogen and 9.23 g of carbon. What mass of benzene will contain 10.00 g of hydrogen?

In a scientific method, a hypothesis is tested by a(n) _____.

Methane and oxygen react to form carbon dioxide and water. What is the mass of water formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?

Which of these statements is incorrect according to Rutherford's model of the atom?

Elements A and Z react to form compound AZ. Compound AZ contains 40% A and 60% Z by mass. Which statement best explains the outcome of mixing 100 g of A is mixed with 100 g of Z?

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

10.00 g of the chemical compound benzene (C₆H₆) contains 0.77 g of hydrogen and 9.23 g of carbon. What mass of benzene will contain 10.00 g of hydrogen?