Question 1

Which of the following can be classified as a mixture and not as a pure substance?
I. oxygen
II. antifreeze
III. distilled water
IV. human blood
V. brass alloy

Accepted Answer

A)   II and V
B)   II and III
C)   I only
D)   II, IV, and V

Question 2

Which of the following is a chemical change?

Accepted Answer

A)   rusting of iron
B)   dissolving salt in water
C)   evaporation of gasoline
D)   cutting a copper wire into two pieces

Question 3

How many of the following pairs of elements and symbols are entirely correct? 
Silver, Si &ensp; Manganese, Mg &ensp; Copper, Co &ensp; Potassium, P

Accepted Answer

A)   none
B)   1
C)   2
D)   3

Question 4

For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all.
-  iron, tungsten, potassium

Accepted Answer

A)   all symbols have one letter
B)   all symbols have two letters
C)   all symbols start with the same letter
D)   all symbols start with a letter not the first letter of the element's English name

Question 5

Indicate whether the following descriptions of matter represents an
-One substance present, two elements present. ____________________

Accepted Answer

A)   element
B)   mixture
C)   compound

Question 6

The description "three substances present, two phases present" is correct for ________.

Accepted Answer

A)   heterogeneous mixtures
B)   homogeneous mixtures
C)   elements
D)   compounds

Question 7

The most abundant elements in the Earth's crust are ________.

Accepted Answer

A)   oxygen and silicon
B)   oxygen and carbon
C)   hydrogen and helium
D)   hydrogen and oxygen

Question 8

Nitrogen gas has a(n)  ________ volume and a(n)  ________ shape.

Accepted Answer

A)   definite; definite
B)   indefinite; definite
C)   definite; indefinite
D)   indefinite; indefinite

Question 9

For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all.
- gold, silver, arsenic

Accepted Answer

A)   all symbols have one letter
B)   all symbols have two letters
C)   all symbols start with the same letter
D)   all symbols start with a letter not the first letter of the element's English name

Question 10

Which of the following statements concerning the known elements is true?

Accepted Answer

A)   88 of the elements are naturally occurring.
B)   No new elements have been identified within the last twenty years.
C)   104 elements are known at present.
D)   Scientists "suspect" that there are more naturally occurring elements to be discovered.

Question 11

Which response includes all of the following that involve chemical changes and no physical changes?
I. burning charcoal
II. melting of gold
III. fermentation of grapes
IV. burning of natural gas
V. melting of ice

Accepted Answer

A)   II and V
B)   I and IV
C)   I, II, and III
D)   I, III, and IV

Question 12

Indicate whether each of the following statements represents a chemical change, a physical change, or no change occurred.
-Hydrochloric acid was added to baking sodaresulting in the evolution of carbon dioxide gas. ____________________

Accepted Answer

The answer of Indicate whether each of the following statements...

Question 13

A pure substance A is found to change upon heating into two new pure substances, B and C. C can be decomposed by chemical means, B cannot be decomposed by chemical means. From this we may conclude that ________.

Accepted Answer

A)   A is an element, B and C are compounds
B)   A is a compound, B and C are elements
C)   A, B and C are all elements
D)   A and C are compounds, B is an element

Question 14

What is the difference between an extensive and an intensive property? Give one example of each.

Accepted Answer

An extensive property is a property that...

Question 15

A liter sample of oxygen has been purified. Which of the following characteristics will not apply to the oxygen sample?

Accepted Answer

A)   Only oxygen is present in the sample.
B)   The sample can be separated into two parts by physical means.
C)   All molecules in the sample will be composed of two atoms, (O2) .
D)   At 25 °C and 1 atm pressure, all portions of the sample will have the same properties.

Question 16

Which of the following substances is a heterogeneous mixture?

Accepted Answer

A)   sodium
B)   baking soda
C)   dextrose (a sugar)  dissolved in water
D)   salt and pepper in a glass

Question 17

For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all.
-  cesium, chlorine, copper

Accepted Answer

A)   all symbols have one letter
B)   all symbols have two letters
C)   all symbols start with the same letter
D)   all symbols start with a letter not the first letter of the element's English name

Question 18

In which pair does the symbol match the element name?

Accepted Answer

A)   strontium - St
B)   chlorine - Cl
C)   gallium - Gl
D)   tungsten - Th

Question 19

For each characterization of matter, choose the appropriate classification from the response list. Responses may be used more than once or need not be used at all.
-  2 substances present, 2 phases present

Accepted Answer

A)   heterogeneous mixture
B)   homogeneous mixture
C)   compound
D)   element

Question 20

In which of the following sequences of elements do each of the elements have a one-letter symbol?

Accepted Answer

A)   sulfur, vanadium, cobalt
B)   chlorine, iron, lithium
C)   nickel, yttrium, potassium
D)   hydrogen, fluorine, phosphorous

Exam 4: Basic Concepts About Matter

For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all. - iron, tungsten, potassium

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Indicate whether the following descriptions of matter represents an -One substance present, two elements present. ____________________

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Which of the following can be classified as a mixture and not as a pure substance? I. oxygen II. antifreeze III. distilled water IV. human blood V. brass alloy

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For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all. - gold, silver, arsenic

Correct AnswerverifiedShow Answer

Which of the following is a chemical change?

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Which response includes all of the following that involve chemical changes and no physical changes? I. burning charcoal II. melting of gold III. fermentation of grapes IV. burning of natural gas V. melting of ice

Correct AnswerverifiedShow Answer

The most abundant elements in the Earth's crust are ________.

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Nitrogen gas has a(n) ________ volume and a(n) ________ shape.

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The description "three substances present, two phases present" is correct for ________.

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For each characterization of matter, choose the appropriate classification from the response list. Responses may be used more than once or need not be used at all. - 2 substances present, 2 phases present

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What is the difference between an extensive and an intensive property? Give one example of each.

Correct AnswerverifiedAn extensive property is a property that...View AnswerShow Answer

In which pair does the symbol match the element name?

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Which of the following statements concerning the known elements is true?

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Which of the following substances is a heterogeneous mixture?

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A pure substance A is found to change upon heating into two new pure substances, B and C. C can be decomposed by chemical means, B cannot be decomposed by chemical means. From this we may conclude that ________.

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How many of the following pairs of elements and symbols are entirely correct? Silver, Si Manganese, Mg Copper, Co Potassium, P

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Indicate whether each of the following statements represents a chemical change, a physical change, or no change occurred. -Hydrochloric acid was added to baking sodaresulting in the evolution of carbon dioxide gas. ____________________

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A liter sample of oxygen has been purified. Which of the following characteristics will not apply to the oxygen sample?

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For each set of elements choose the appropriate characterization of the set's elemental symbols from the response list. Responses may be used more than once or need not be used at all. - cesium, chlorine, copper

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In which of the following sequences of elements do each of the elements have a one-letter symbol?

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Nitrogen gas has a(n) volume and a(n) shape.

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An extensive property is a property that...
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