AnswersFL-2003350-Chemistry 1 HonorsCumulative Exam

Cumulative Exam — Cumulative exam Answers

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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
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The accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories. The most accurate measurement is made by

A
Dr. Chopra, who measures 13.487 g/mL.
B
Dr. Thompson, who measures 13.5 g/mL.
C
Dr. Smith, who measures 13.54 g/mL.
D
Dr. Tyler, who measures 13.9336 g/mL.
23

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
24

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
25

What is the electron configuration for helium (He)?

A
1s1
B
1s2
C
1s22s1
D
1s22s2

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