Molecules and Chemical Nomenclature

By taking this quiz, you should be able to define a molecule, name simple molecules based on their formulas, and determine a formula of a molecule based on its name.

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Views #: 1480

Questions #: 18

Time: 10 minutes

Pass Score: 80.0%

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The smallest part of a substance that has the physical and chemical properties of that substance

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A molecule with only two atoms is called _______ molecules

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A formal listing of what and how many atoms are in a molecule

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two words

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The molecular formula for elemental hydrogen

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The molecular formula for elemental hydrogen H₂ with H being the symbol for (1) and the subscript 2 implying that there are (2) atoms of this element in the molecule.

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hydrogen

oxygen

nitrogen

two

three

four

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Select the diatomic elements from the following list

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Hydrogen

Oxygen

Nitrogen

Helium

Fluorine

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It is assumed that there is only one atom in a formula if there is no numerical subscript on the right side of an element’s symbol.

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True

False

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The connection between two atoms in a molecule

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two words

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When nonmetals connect with other nonmetals, the compound typically do not exist as molecules

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True

False

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A very specific system for naming compounds, in which unique substances get unique names

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Missing

two words

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Simple molecules that have only two elements in them

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two words

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Numerical Prefixes Used in Naming Molecular Compounds

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The number of atoms of an element	Prefix
1	(1)
2	(2)
3	(3)
4	(4)
5	(5)
6	(6)
7	(7)
8	(8)
9	(9)
10	(10)

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hepta-

di-

tri-

tetra-

penta-

mono-

deca-

hexa-

octa-

nona-

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What do you call the following element

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SO₂

Sulfur trioxide

Sulfur dioxide

Sulfur nonaoxide

Sulfur tetraoxide

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What is the name of the following compound?

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Missing

SO₃

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What do you call the following element?

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PO₅

Phosphorus pentaoxide

Phosphorus pentoxide

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What is the symbol of nitrogen trichloride?

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What is the symbol of diphosphorus pentoxide?

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Name each molecule

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(1) PF₃
(2) CO
(3) Se₂Br₂
(4) SF₄
(5) P₂S₅

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phosphorus trifluoride

diselenium dibromide

sulfur tetrafluoride

carbon monoxide

diphosphorus pentasulfide

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Give the formula for each molecule

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(1) carbon tetrachloride
(2) silicon dioxide
(3) trisilicon tetranitride
(4) disulfur difluoride
(5) iodine pentabromide

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SiO₂

CCl₄

Si₃N₄

IBr₅

S₂F₂

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Explanation

Year 10

The number of atoms of an element	Prefix
1	1($)
2	2($)
3	3($)
4	4($)
5	5($)
6	6($)
7	7($)
8	8($)
9	9($)
10	10($)

The smallest part of a substance that has the physical and chemical properties of that substance

Correct Answer

Explanation

A molecule with only two atoms is called _______ molecules

Correct Answer

Explanation

A formal listing of what and how many atoms are in a molecule

Correct Answer

Explanation

The molecular formula for elemental hydrogen

Correct Answer

Explanation

Select the diatomic elements from the following list

Correct Answer

Explanation

It is assumed that there is only one atom in a formula if there is no numerical subscript on the right side of an element’s symbol.

Correct Answer

Explanation

The connection between two atoms in a molecule

Correct Answer

Explanation

When nonmetals connect with other nonmetals, the compound typically do not exist as molecules

Correct Answer

Explanation

A very specific system for naming compounds, in which unique substances get unique names

Correct Answer

Explanation

Simple molecules that have only two elements in them

Correct Answer

Explanation

Numerical Prefixes Used in Naming Molecular Compounds

Correct Answer

Explanation

What do you call the following element

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Explanation

What is the name of the following compound?

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Explanation

What do you call the following element?

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Explanation

What is the symbol of nitrogen trichloride?

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Explanation

What is the symbol of diphosphorus pentoxide?

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Explanation

Name each molecule

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Explanation

Give the formula for each molecule

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Explanation

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