AnswersChemistry Honors AThe Structure of the Atom

The Structure of the Atom — Unit test Answers

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1
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Which of these is an example of a physical change?

A
sugar, when heated, producing carbon dioxide and water
B
solid ice, when heated, turning into liquid water
C
sodium, when exposed to chlorine, forming sodium chloride
D
aluminum, when heated in air, forming aluminum oxide
2
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When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

A
because the metal reaches a high temperature
B
because the metal begins to melt
C
because a new substance is formed
D
because the metal is malleable
3

Which statement describes an extensive property of matter?

A
It changes with the color of a substance.
B
It changes when a new substance is formed.
C
It changes with the amount of sample that is present.
D
It changes with the composition of a substance.
4

Which statement describes a chemical property of water?

A
It reacts with sodium metal.
B
It has a melting point of 0°C.
C
It has a density of about 1 g/mL.
D
It is clear and colorless.
5

How are isotopes defined?

A
forms of different elements that have the same number of neutrons in each atom
B
forms of different elements that have the same number of protons in each atom
C
forms of the same element that differ in the number of neutrons in each atom
D
forms of the same element that differ in the number of protons in each atom
6

The table below gives the data that is needed to calculate the average atomic mass of element B.IsotopeAtomic mass (amu)Relative abundance (%)B-1010.0119.91B-1111.0180.09Based on these data, what is the average atomic mass of element B?

A
10.01
B
10.51
C
10.81
D
11.01
7

The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have?

A
24
B
28
C
76
D
80
8

Which of these properties is the best one to use for identification of an element?

A
the number of neutrons in the atomic nucleus
B
the number of protons in the atomic nucleus
C
the number of isotopes that are formed by the element
D
the number of charges on ions of the element

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