Question 1

Which of the following elements is a gas at room temperature?

Accepted Answer

A)  argon (Ar) 
B)  lead (Pb) 
C)  cesium (Cs) 
D)  indium (In) 
E)  lithium (Li) 
A)  argon (Ar) 
B)  lead (Pb) 
C)  cesium (Cs) 
D)  indium (In) 
E)  lithium (Li)

Question 2

Which of the following elements is an alkali metal?

Accepted Answer

A)  argon (Ar) 
B)  lead (Pb) 
C)  cerium (Cr) 
D)  indium (In) 
E)  lithium (Li) 
A)  argon (Ar) 
B)  lead (Pb) 
C)  cerium (Cr) 
D)  indium (In) 
E)  lithium (Li)

Question 3

Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture?

Accepted Answer

A)  element: A, C; compound: A, B, C; mixture: A, B 
B)  element: C; compound: A, B; mixture: B 
C)  element: A, C; compound: A, B; mixture: A 
D)  element: A, C; compound: A, B; mixture: A, B 
A)  element: A, C; compound: A, B, C; mixture: A, B 
B)  element: C; compound: A, B; mixture: B 
C)  element: A, C; compound: A, B; mixture: A 
D)  element: A, C; compound: A, B; mixture: A, B

Question 4

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 5

Dioxins are highly toxic compounds that form upon the burning of certain plastics, especially PVC. Dioxins bioaccumulate, which means that animals higher in the food chain tend to have greater concentrations. Most of our exposure to dioxins comes from the food we eat rather than the air we breathe. How many milligrams of dioxins are there in a liter of milk containing   ?

Accepted Answer

A)  0.16 mg 
B)  1.6 ×   mg = 0.0016 mg 
C)  1.6 ×   mg = 0.00000016 mg 
D)  1.6 ×   mg = 0.000016 mg 
A)  0.16 mg 
B)  1.6 ×   mg = 0.0016 mg 
C)  1.6 ×   mg = 0.00000016 mg 
D)  1.6 ×   mg = 0.000016 mg

Question 6

The oldest known elements in the periodic table are the ones ________.

Accepted Answer

A)  with the lowest atomic numbers 
B)  with the highest atomic numbers 
C)  that match their Latin names 
D)  with atomic symbols that match their modern names 
A)  with the lowest atomic numbers 
B)  with the highest atomic numbers 
C)  that match their Latin names 
D)  with atomic symbols that match their modern names

Question 7

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 8

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 9

How does a suspension differ from a solution?

Accepted Answer

A)  A suspension is a heterogeneous mixture whose components can be separated by simple filtration. A solution is a homogeneous mixture which cannot be separated by simple filtration. 
B)  A suspension is a heterogeneous mixture consisting of different phases whereas a solution is a homogeneous mixture consisting of a single phase. 
C)  Although a solution and suspension are both homogeneous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge. 
D)  The difference between a suspension and a solution can only be determined by chemical means. 
A)  A suspension is a heterogeneous mixture whose components can be separated by simple filtration. A solution is a homogeneous mixture which cannot be separated by simple filtration. 
B)  A suspension is a heterogeneous mixture consisting of different phases whereas a solution is a homogeneous mixture consisting of a single phase. 
C)  Although a solution and suspension are both homogeneous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge. 
D)  The difference between a suspension and a solution can only be determined by chemical means.

Question 10

Which atom is largest?

Accepted Answer

A)  Rb 
B)  K 
C)  Na 
D)  Li 
E)  H 
A)  Rb 
B)  K 
C)  Na 
D)  Li 
E)  H

Question 11

How would you classify the following material? coffee (with milk)

Accepted Answer

A)  a suspension 
B)  a heterogeneous mixture 
C)  a solution 
D)  an element 
E)  a compound 
A)  a suspension 
B)  a heterogeneous mixture 
C)  a solution 
D)  an element 
E)  a compound

Question 12

If you have one molecule of CO2, how many molecules of O2 does it contain?

Accepted Answer

A)  None, O2 is a different molecule than CO2. 
B)  One, CO2 is a mixture of C and O2. 
C)  Two, CO2 is a mixture of C and 2 O. 
D)  Three, CO2 contains three molecules. 
E)  none of the above 
A)  None, O2 is a different molecule than CO2. 
B)  One, CO2 is a mixture of C and O2. 
C)  Two, CO2 is a mixture of C and 2 O. 
D)  Three, CO2 contains three molecules. 
E)  none of the above

Question 13

What is the name of the following compound? CaCl2

Accepted Answer

A)  calcium chloride 
B)  carbon chloride 
C)  dichlorocalcium 
D)  calc two 
E)  dicalcium chloride 
A)  calcium chloride 
B)  carbon chloride 
C)  dichlorocalcium 
D)  calc two 
E)  dicalcium chloride

Question 14

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 15

Why can't the elements of a compound be separated from one another by physical means?

Accepted Answer

A)  They are too homogeneous when found within a compound. 
B)  Their atoms are too tightly bound to one another. 
C)  Elements found within a compound tend to be inert. 
D)  Elements tend not to be soluble in water. 
A)  They are too homogeneous when found within a compound. 
B)  Their atoms are too tightly bound to one another. 
C)  Elements found within a compound tend to be inert. 
D)  Elements tend not to be soluble in water.

Question 16

Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components. Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components?

Accepted Answer

A)  A chemical property involves a chemical change so that you no longer have what you had. 
B)  Chemical properties are not as apparent as are physical properties. 
C)  The chemical properties of the components of a mixture are too similar to each other. 
D)  The chemical properties of the components of a mixture are too different from each other. 
A)  A chemical property involves a chemical change so that you no longer have what you had. 
B)  Chemical properties are not as apparent as are physical properties. 
C)  The chemical properties of the components of a mixture are too similar to each other. 
D)  The chemical properties of the components of a mixture are too different from each other.

Question 17

Which of these does not describe a metal at room temperature?

Accepted Answer

A)  gas 
B)  solid 
C)  liquid 
D)  shiny 
E)  bendable 
A)  gas 
B)  solid 
C)  liquid 
D)  shiny 
E)  bendable

Question 18

Many dry cereals are fortified with iron, which is added to the cereal in the form of small iron particles. How might these particles be separated from the cereal?

Accepted Answer

A)  add water and the iron particles will float to the top 
B)  blend the cereal to a fine consistency and pass through a filter 
C)  collect the iron filings with a magnet 
D)  heat the cereal so that the iron particles melt and thereby coalesce 
A)  add water and the iron particles will float to the top 
B)  blend the cereal to a fine consistency and pass through a filter 
C)  collect the iron filings with a magnet 
D)  heat the cereal so that the iron particles melt and thereby coalesce

Question 19

A compound is represented by the ________.

Accepted Answer

A)  elemental formula 
B)  periodic table 
C)  chemical formula 
D)  compoundic symbol 
A)  elemental formula 
B)  periodic table 
C)  chemical formula 
D)  compoundic symbol

Question 20

What can be said about drinking water that is 99.9999 percent free of some poison, such as a pesticide?

Accepted Answer

A)  In each 10,000 parts of the contaminated water there is one part pesticide and 9999 parts pure water. 
B)  In each 100,000 parts of the contaminated water there is one part pesticide and 99,999 parts pure water. 
C)  The ratio of water molecules to pesticide molecules in the glass is so great that drinking the water is not problematic. 
D)  The water is highly contaminated and surely not fit to drink. 
A)  In each 10,000 parts of the contaminated water there is one part pesticide and 9999 parts pure water. 
B)  In each 100,000 parts of the contaminated water there is one part pesticide and 99,999 parts pure water. 
C)  The ratio of water molecules to pesticide molecules in the glass is so great that drinking the water is not problematic. 
D)  The water is highly contaminated and surely not fit to drink.

Which of the following elements is a gas at room temperature?

Which of the following elements is an alkali metal?

Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture?

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

The oldest known elements in the periodic table are the ones ________.

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

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

How does a suspension differ from a solution?

Which atom is largest?

How would you classify the following material? coffee (with milk)

If you have one molecule of CO_2, how many molecules of O₂ does it contain?

What is the name of the following compound? CaCl₂

Which statement best describes a compound?

Why can't the elements of a compound be separated from one another by physical means?

Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components. Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components?

Which of these does not describe a metal at room temperature?

Many dry cereals are fortified with iron, which is added to the cereal in the form of small iron particles. How might these particles be separated from the cereal?

A compound is represented by the ________.

What can be said about drinking water that is 99.9999 percent free of some poison, such as a pesticide?

About Science

Particles of Matter

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

Exam 3: Elements of Chemistry

Which of the following elements is a gas at room temperature?

Which of the following elements is an alkali metal?

Each circle represents an atom. Which of the following boxes contains an element? A compound? A mixture?

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

The oldest known elements in the periodic table are the ones ________.

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

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

How does a suspension differ from a solution?

Which atom is largest?

How would you classify the following material? coffee (with milk)

If you have one molecule of CO2, how many molecules of O2 does it contain?

What is the name of the following compound? CaCl2

Which statement best describes a compound?

Why can't the elements of a compound be separated from one another by physical means?

Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components. Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components?

Which of these does not describe a metal at room temperature?

Many dry cereals are fortified with iron, which is added to the cereal in the form of small iron particles. How might these particles be separated from the cereal?

A compound is represented by the ________.

What can be said about drinking water that is 99.9999 percent free of some poison, such as a pesticide?

About Science

Particles of Matter

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

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

If you have one molecule of CO_2, how many molecules of O₂ does it contain?

What is the name of the following compound? CaCl₂