AnswersPhysical ScienceChemical Bonding

Practice Test Answers

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1
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Which element is least likely to form chemical bonds?

A
carbon cap c
B
phosphorus cap p
C
sodium Na
D
helium He
2
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How do the nuclei of covalently bonded atoms help keep the bond together?

A
Neutral particles in the nucleus provide enough mass that the force of gravity holds the atoms together.
B
Neutral particles in the nucleus can become positive or negative in order to balance the charges.
C
Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.
D
Positive particles in the nucleus change into negative particles that enter electron shells.
4

During a test, what can a student use to identify what type and how many atoms are in a chemical compound?

A
common names
B
the National Chemistry Society
C
the International Union of Pure and Applied Chemistry
D
chemical names
5

Which shows two structures that are made mostly of metal?

A
Image with description An image of three sugar cubes. An image of a table bell.
B
Image with description An image of a car. An image of a bridge made up of metal and cables.
C
Image with description An image of the Mount Rushmore. An image of a table bell.
D
Image with description An image of the Mount Rushmore. An Image of Eiffel tower.
7

Which term best describes all atoms in ionic bonds?

A
unstable
B
positively charged
C
stable
D
negatively charged
8

Why do natural polymers not pose as much of an issue in landfills as synthetic polymers?

A
Natural polymers are biodegradable, and synthetic polymers are not biodegradable.
B
Natural polymers are expensive to recycle, and synthetic polymers are cheap to recycle.
C
Natural polymers are not biodegradable, and synthetic polymers are biodegradable.
D
Natural polymers are cheap to recycle, and synthetic polymers are expensive to recycle.
11

What causes an ionic bond to form between sodium and chlorine?

A
Sodium atoms gain electrons.
B
Sodium and chlorine atoms share electrons.
C
Sodium atoms donate electrons.
D
Sodium and chlorine atoms switch electrons.
12

Jenny is studying a compound that has two oxygen atoms and one nitrogen atom. Which statement describes the subscripts she will use to write the chemical formula?

A
She will use one 3 as a subscript.
B
She will use one 2 and one 1 as subscripts.
C
She will use one 2 as a subscript.
D
She will use two 2s and one 1 as subscripts.
14

What does the chemical formula cap c sub 3 cap h sub 6 cap o sub 2 tell about a molecule of the compound it represents?

A
It is made up of 1 atom composed of 3 different elements.
B
It is made up of 11 total atoms of 3 different elements.
C
It is made up of 3 atoms of 11 different elements.
D
It is made up of 11 atoms joined in a straight line.
15

How many atoms of each element are in the chemical formula NH sub 4 NO sub 3 ?

A
5 nitrogen, 1 hydrogen, and 1 oxygen
B
2 nitrogen, 4 hydrogen, and 3 oxygen
C
1 nitrogen, 1 hydrogen, and 3 oxygen
D
1 nitrogen, 4 hydrogen, and 3 oxygen
16

Atoms of iron Fe form metallic bonds with other iron atoms. How are the valence electrons of these atoms rearranged to form the bonds?

A
Electrons are transferred from the iron atoms to atoms in the air.
B
A few valence electrons are shared between the atoms.
C
Many valence electrons are shared between the atoms.
D
Electrons are transferred to the iron atoms from atoms in the air.

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