Question 1

When heat is added to boiling water, the water temperature

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 2

An infant gains 10 pounds. Why would you consider this to be an example of a chemical change?

Accepted Answer

During a chemical change new m

Question 3

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 4

Evaporation is a cooling process and condensation is

Accepted Answer

A) a warming process. 
B) a cooling process also. 
C) neither a warming nor cooling process. 
A) a warming process. 
B) a cooling process also. 
C) neither a warming nor cooling process.

Question 5

How many different elements are in the compound C₆H₁₂O₆?

Accepted Answer

A) 3 
B) 6 
C) 24 
D) All of the elements are the same. 
A) 3 
B) 6 
C) 24 
D) All of the elements are the same.

Question 6

What is the name of the following compound? NaF

Accepted Answer

A) sodium fluoride 
B) natural fosfate 
C) natrium fluoride 
D) nitrogen afleck 
E) sodium phosphide 
A) sodium fluoride 
B) natural fosfate 
C) natrium fluoride 
D) nitrogen afleck 
E) sodium phosphide

Question 7

Oxygen, O2, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

Accepted Answer

A) Yes. This is the reason patients are given pure (100%)oxygen during medical procedures. 
B) Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. 
C) No. Breathing 100% oxygen for extended periods of time can be damaging to the body. 
D) No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes. 
A) Yes. This is the reason patients are given pure (100%)oxygen during medical procedures. 
B) Yes. Increased oxygenation of the bloodstream is good for you and can increase your life span. 
C) No. Breathing 100% oxygen for extended periods of time can be damaging to the body. 
D) No. Large amounts of oxygen will absorb hydrogen from the body and increase the amount of water in the body causing an imbalance in electrolytes.

Question 8

Of the three sciences, physics, chemistry, and biology, the most complex is

Accepted Answer

A) physics because it involves many mathematical equations. 
B) chemistry because there are so many possible combinations of atoms. 
C) biology because it is based upon both the laws of chemistry and physics. 
D) All three of these sciences are equally complex. 
A) physics because it involves many mathematical equations. 
B) chemistry because there are so many possible combinations of atoms. 
C) biology because it is based upon both the laws of chemistry and physics. 
D) All three of these sciences are equally complex.

Question 9

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 10

We feel uncomfortably warm on a muggy day because water molecules are

Accepted Answer

A) evaporating from our moist bodies. 
B) condensing on our bodies. 
C) preventing the evaporation from our moist bodies. 
A) evaporating from our moist bodies. 
B) condensing on our bodies. 
C) preventing the evaporation from our moist bodies.

Question 11

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 12

Some products on the market today involving nanotechnology include

Accepted Answer

A) cars. 
B) elevators. 
C) sunscreen. 
D) cosmetics. 
E) all of the above 
A) cars. 
B) elevators. 
C) sunscreen. 
D) cosmetics. 
E) all of the above

Question 13

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that

Accepted Answer

A) the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. 
B) on the submicroscopic level, chemists find that matter is made of extremely small particles, such as atoms and molecules. 
C) anything that a chemist can see, touch, hear, smell, or taste is an illusion. 
D) elements are made up of only three basic types of matter. 
A) the fundamental particles of matter can also be seen when looked at closely with a magnifying glass. 
B) on the submicroscopic level, chemists find that matter is made of extremely small particles, such as atoms and molecules. 
C) anything that a chemist can see, touch, hear, smell, or taste is an illusion. 
D) elements are made up of only three basic types of matter.

Question 14

In the winter Vermonters make a tasty treat called "sugar on snow" in which they pour boiled-down maple syrup onto a scoop of clean fresh snow. As the syrup hits the snow it forms a delicious taffy. Which of the following changes are involved in the making of sugar on snow?

Accepted Answer

A) Boiling down the maple syrup involves the evaporation of water. 
B) The syrup warms the snow causing it to melt while the syrup becomes more viscous. 
C) As the maple syrup is boiled the sugar within the syrup begins to caramelize, which is an example of a chemical change. 
D) All of the above changes are involved in the making of sugar on snow. 
A) Boiling down the maple syrup involves the evaporation of water. 
B) The syrup warms the snow causing it to melt while the syrup becomes more viscous. 
C) As the maple syrup is boiled the sugar within the syrup begins to caramelize, which is an example of a chemical change. 
D) All of the above changes are involved in the making of sugar on snow.

Question 15

Which of the following would be considered a chemical property?

Accepted Answer

A) reactivity towards water 
B) melting temperature 
C) boiling temperature 
D) conductivity 
E) flexibility 
A) reactivity towards water 
B) melting temperature 
C) boiling temperature 
D) conductivity 
E) flexibility

Question 16

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

Accepted Answer

A) The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). 
B) The starches within the kernels are cooked by the high temperatures (chemical change). 
C) Both A and B occur. 
D) Physical and chemical changes cannot occur without a real chemical reaction taking place. 
A) The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). 
B) The starches within the kernels are cooked by the high temperatures (chemical change). 
C) Both A and B occur. 
D) Physical and chemical changes cannot occur without a real chemical reaction taking place.

Question 17

Turns into a silvery liquid when heated in the absence of oxygen.

Accepted Answer

The answer of Turns into a silvery liquid when heated...

Question 18

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 19

The probe tip of a scanning probe microscope

Accepted Answer

A) floats above the atoms of a sample. 
B) etches into the atoms of a sample. 
C) chemically changes the atoms of a sample. 
D) injects a magnetic field into the atoms of a sample. 
A) floats above the atoms of a sample. 
B) etches into the atoms of a sample. 
C) chemically changes the atoms of a sample. 
D) injects a magnetic field into the atoms of a sample.

Question 20

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

Exam 11: Investigating Matter

When heat is added to boiling water, the water temperature

An infant gains 10 pounds. Why would you consider this to be an example of a chemical change?

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?

Evaporation is a cooling process and condensation is

How many different elements are in the compound C₆H₁₂O₆?

What is the name of the following compound? NaF

Oxygen, O2, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?

Of the three sciences, physics, chemistry, and biology, the most complex is

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

We feel uncomfortably warm on a muggy day because water molecules are

What is the name of the following compound? SF3

Some products on the market today involving nanotechnology include

A TV screen looked at from a distance appears as a smooth continuous flow of images. Up close, however, we see this is an illusion. What really exists are a series of tiny dots (pixels). This is similar to a chemist's view of matter in that

In the winter Vermonters make a tasty treat called "sugar on snow" in which they pour boiled-down maple syrup onto a scoop of clean fresh snow. As the syrup hits the snow it forms a delicious taffy. Which of the following changes are involved in the making of sugar on snow?

Which of the following would be considered a chemical property?

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

Turns into a silvery liquid when heated in the absence of oxygen.

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

The probe tip of a scanning probe microscope

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

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Oxygen, O₂, is certainly good for you. Does it follow that if small amounts of oxygen are good for you then large amounts of oxygen would be especially good for you?