AnswersNC-Physical Science CR 2024Metallic Bonds

Metallic Bonds — Unit test Answers

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How many atoms of nitrogen are in the chemical formula Ni(NO3)2?

A
2
B
1
C
6
D
3
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Which is the best description of a molecule?

A
A molecule of an element is composed of at least two types of atoms.
B
A molecule of a compound is composed of only one atom.
C
A molecule of a compound is composed of at least two atoms.
D
A molecule of an element is composed of exactly two types of atoms.
43

In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds.Two sets of double bonds means that the total number of electrons being shared in the molecule is

A
two.
B
four.
C
six.
D
eight.
44

The compound magnesium phosphate has the chemical formula Mg3(PO4)2. In this compound, phosphorous and oxygen act together as one charged particle, which is connected to magnesium, the other charged particle.What does the 2 mean in the formula 5Mg3(PO4)2?

A
There are two elements in magnesium phosphate.
B
There are two molecules of magnesium phosphate.
C
There are two magnesium ions in a molecule of magnesium phosphate.
D
There are two phosphate ions in a molecule of magnesium phosphate.

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