Question 1

A sample of iron weighs more after it rusts because

Accepted Answer

A) it has expanded into a greater volume. 
B) rust contains twice as many iron atoms. 
C) of the additional oxygen it contains. 
D) Wrong.Iron actually weighs less after it rusts. 
A) it has expanded into a greater volume. 
B) rust contains twice as many iron atoms. 
C) of the additional oxygen it contains. 
D) Wrong.Iron actually weighs less after it rusts.

Question 2

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

Accepted Answer

A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash 
A) water boiling and being converted into steam 
B) water being electrolyzed and being converted in hydrogen and oxygen 
C) iron metal reacting with oxygen to form rust 
D) a candy bar being digested by a student 
E) charcoal being converted into ash

Question 3

Which statement best describes a compound?

Accepted Answer

A) a material that is made up of a combination of atoms bonded together 
B) a mixture of more than one element 
C) a mixture of atoms 
D) a material that is made up of a single type of atom 
E) none of the above 
A) a material that is made up of a combination of atoms bonded together 
B) a mixture of more than one element 
C) a mixture of atoms 
D) a material that is made up of a single type of atom 
E) none of the above

Question 4

The following image describes what type of change?

Accepted Answer

A) a chemical change 
B) a physical change 
C) a change in state 
D) no change 
E) an elemental change 
A) a chemical change 
B) a physical change 
C) a change in state 
D) no change 
E) an elemental change

Question 5

A supercritical fluid least resembles

Accepted Answer

A) a solid. 
B) a liquid. 
C) a gas. 
D) All of the above. 
A) a solid. 
B) a liquid. 
C) a gas. 
D) All of the above.

Question 6

If you have two molecules of TiO2, how many oxygen atoms would you have?

Accepted Answer

A) 4 
B) 2 
C) 3 
D) 6 
E) none 
A) 4 
B) 2 
C) 3 
D) 6 
E) none

Question 7

How many atoms are in one molecule of Na2SO4?

Accepted Answer

A) 7 
B) 2 
C) 4 
D) 3 
E) 24 
A) 7 
B) 2 
C) 4 
D) 3 
E) 24

Question 8

What is the name of the following compound? SF3

Accepted Answer

A) sulfur trifluoride 
B) sulfur fluoride 
C) trifluorosulphide 
D) fluorine sulphide 
E) none of the above 
A) sulfur trifluoride 
B) sulfur fluoride 
C) trifluorosulphide 
D) fluorine sulphide 
E) none of the above

Question 9

An example of basic research is

Accepted Answer

A) the development of new plastics that can be recycled. 
B) the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone. 
C) the study of the composition of the atom. 
D) the design of new batteries for electric cars. 
E) the study of natural compounds in sea animals to look for new molecules that can be used for medicine. 
A) the development of new plastics that can be recycled. 
B) the study of the relationship between the amount of automobile emissions gases in the atmosphere and the decomposition of atmospheric ozone. 
C) the study of the composition of the atom. 
D) the design of new batteries for electric cars. 
E) the study of natural compounds in sea animals to look for new molecules that can be used for medicine.

Question 10

Which of the following boxes represents a compound?       A B C

Accepted Answer

A) only A 
B) only B 
C) only C 
D) both A and C 
A) only A 
B) only B 
C) only C 
D) both A and C

Question 11

Oxygen atoms are used to make water molecules.Does this mean that oxygen, O2 ,and water, H2 O,have similar properties?

Accepted Answer

A) Yes,and this explains how fish are able to breathe water. 
B) Yes,but that their properties are similar is only a coincidence. 
C) No,but their similar properties are only a coincidence. 
D) No,compounds are uniquely different from the elements from which they're made. 
A) Yes,and this explains how fish are able to breathe water. 
B) Yes,but that their properties are similar is only a coincidence. 
C) No,but their similar properties are only a coincidence. 
D) No,compounds are uniquely different from the elements from which they're made.

Question 12

Water and ethanol can be separated by heating the ethanol until it boils away from the water.What type of change is this?

Accepted Answer

A) a physical change 
B) a chemical change 
C) a molecular change 
D) a decomposition 
E) none of the above 
A) a physical change 
B) a chemical change 
C) a molecular change 
D) a decomposition 
E) none of the above

Question 13

The element silicon has a melting point of 1,410°C and a boiling point of 2,355°C.It is a weak conductor of electricity,its density is 2.3 grams per cubic centimeter and it easily forms silicon dioxide when exposed to air.Which of the following is a chemical property of silicon?

Accepted Answer

A) its ability to conduct electricity 
B) its density 
C) its melting point 
D) its ability to react with oxygen 
E) C and D 
A) its ability to conduct electricity 
B) its density 
C) its melting point 
D) its ability to react with oxygen 
E) C and D

Question 14

Is aging primarily an example of a physical or chemical change?

Accepted Answer

A) Aging is an example of a physical change since it involves our physical bodies getting older each day. 
B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules. 
C) Aging cannot be classified as either a physical or chemical change. 
D) None of the above is true. 
A) Aging is an example of a physical change since it involves our physical bodies getting older each day. 
B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules. 
C) Aging cannot be classified as either a physical or chemical change. 
D) None of the above is true.

Question 15

Compared to microtechnology,nanotechnology focuses on a scale that is about

Accepted Answer

A) 10 times smaller. 
B) 100 times smaller. 
C) 1000 times smaller. 
D) a million times smaller. 
A) 10 times smaller. 
B) 100 times smaller. 
C) 1000 times smaller. 
D) a million times smaller.

Question 16

Chemistry is the study of

Accepted Answer

A) matter. 
B) transformations of matter. 
C) only microscopic phenomena. 
D) only macroscopic phenomena. 
E) both A and B 
A) matter. 
B) transformations of matter. 
C) only microscopic phenomena. 
D) only macroscopic phenomena. 
E) both A and B

Question 17

How many atoms of Oxygen (O)are in H3OClO4?

Accepted Answer

A) 5 
B) 2 
C) 3 
D) 7 
E) 1 
A) 5 
B) 2 
C) 3 
D) 7 
E) 1

Question 18

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C.Which of the following statements is true?

Accepted Answer

A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above 
A) At 70°C you would have methanol gas and liquid ethanol. 
B) At 90°C you would have methanol and ethanol as solids. 
C) At 50°C you would have methanol and ethanol as gases. 
D) At 40°C the methanol reacts with the ethanol. 
E) none of the above

Question 19

What is found in between the particles of a gas?

Accepted Answer

A) air 
B) nothing 
C) elements 
D) temperature 
A) air 
B) nothing 
C) elements 
D) temperature

Question 20

If you have one molecule of TiO2, how many molecules of O2 does it contain?

Accepted Answer

A) None,O2 is a different molecule than TiO2. 
B) One,TiO2 is a mixture of Ti and O2. 
C) Two,TiO2 is a mixture of Ti and 2 O. 
D) Three,TiO2 contains three molecules. 
E) none of the above 
A) None,O2 is a different molecule than TiO2. 
B) One,TiO2 is a mixture of Ti and O2. 
C) Two,TiO2 is a mixture of Ti and 2 O. 
D) Three,TiO2 contains three molecules. 
E) none of the above

Exam 14: Elements of Chemistry

A sample of iron weighs more after it rusts because

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

Which statement best describes a compound?

The following image describes what type of change?

A supercritical fluid least resembles

If you have two molecules of TiO2, how many oxygen atoms would you have?

How many atoms are in one molecule of Na2SO4?

What is the name of the following compound? SF3

An example of basic research is

Which of the following boxes represents a compound? A B C

Oxygen atoms are used to make water molecules.Does this mean that oxygen, O2 ,and water, H2 O,have similar properties?

Water and ethanol can be separated by heating the ethanol until it boils away from the water.What type of change is this?

The element silicon has a melting point of 1,410°C and a boiling point of 2,355°C.It is a weak conductor of electricity,its density is 2.3 grams per cubic centimeter and it easily forms silicon dioxide when exposed to air.Which of the following is a chemical property of silicon?

Is aging primarily an example of a physical or chemical change?

Compared to microtechnology,nanotechnology focuses on a scale that is about

Chemistry is the study of

How many atoms of Oxygen (O)are in H3OClO4?

The boiling point of methanol is 65°C and the boiling point of ethanol is 78°C.Which of the following statements is true?

What is found in between the particles of a gas?

If you have one molecule of TiO2, how many molecules of O2 does it contain?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

Filters

If you have two molecules of TiO_2, how many oxygen atoms would you have?

How many atoms are in one molecule of Na₂SO₄?

What is the name of the following compound? SF₃

Oxygen atoms are used to make water molecules.Does this mean that oxygen, O₂ ,and water, H₂ O,have similar properties?

How many atoms of Oxygen (O)are in H₃OClO₄?

If you have one molecule of TiO_2, how many molecules of O₂ does it contain?