Answers26-27 WHS-Chemistry-1stSixWeeksThe Structure of the Atom

The Structure of the Atom — Unit test Answers

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21
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Which element has 16 protons in its nucleus?

A
neon
B
oxygen
C
sodium
D
sulfur
22
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Which list includes only physical properties?

A
density, reactivity, and conductivity
B
boiling point, conductivity, and color
C
color, odor, and flammability
D
flammability, reactivity, and ductility
23

The mass number of Fe2+ is 56. How many neutrons are there in a single Fe2+ atom?

A
28
B
30
C
56
D
58
24

A student performs the following experiment.Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation.What has most likely occurred in the beaker?

A
a chemical change in step 1 and a physical change in step 2
B
a physical change in step 1 and a chemical change in step 2
C
chemical changes in both step 1 and step 2
D
physical changes in both step 1 and step 2
25

A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?

A
–3
B
–2
C
0
D
+3

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