Question 1

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

Question 2

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.

Question 3

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.

Question 4

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.

Question 5

Which of the following is not the name of a chemical family?

Accepted Answer

A) heavy metals 
B) transition metals 
C) alkali metals 
D) alkaline-earth metals 
E) noble gases

Question 6

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.

Question 7

Oxygen atoms are used to make water molecules. Does this mean that oxygen,  , and water,  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.

Question 8

A compound is represented by the ________.

Accepted Answer

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

Question 9

The atomic symbol for cobalt is ________.

Accepted Answer

A) Co 
B) CO 
C) Ct 
D) 27

Question 10

What chemical change occurs when a wax candle burns?

Accepted Answer

A) The wax near the flame melts. 
B) The molten wax is pulled upwards through the wick. 
C) The wax within the wick is heated to about 600°C. 
D) The heated wax molecules combine with oxygen molecules.

Question 11

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

Question 12

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)

Question 13

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

Question 14

Which of the following is not a chemical change?

Accepted Answer

A) a rock being crushed to powder 
B) grass growing 
C) grape juice turning into wine 
D) a loaf of bread growing mold 
E) wood burning to ash

Question 15

Which of the following elements are in the same group as silicon (Si)?

Accepted Answer

A) C 
B) P 
C) As 
D) B 
E) none of the above

Question 16

Which of the following statements best describes an element?

Accepted Answer

A) a material consisting of only one type of atom 
B) a material that is pure 
C) a material that has consistent physical properties 
D) a material with more than one type of atom 
E) a material that has consistent chemical properties

Question 17

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

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

Question 19

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

Accepted Answer

A) molecule A because it is the first to transform into a liquid 
B) molecule B because it is first to transform into a liquid 
C) molecule A because it remains in the gaseous phase 
D) molecule B because it remains in the gaseous phase

Question 20

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

Exam 3: Elements of Chemistry

What is the name of the following compound? SF₃