Matter Unit Test Review

What statement can be supported by the information in the molecule model?

• It shows an atom with 14 neutrons.

• It shows a molecule with 2 different elements.

• It shows a molecule with 4 different elements.

• It shows an atom with 14 elecrons.

Answer explanation

The correct choice is that it shows a molecule with 2 different elements, as the model indicates the presence of distinct types of atoms, confirming the existence of a compound formed by two elements.

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NGSS.MS-PS1-1

Chemical formula for pyrite: FeS₂

_{How many atoms are required to make pyrite?}

• 2

• 3

• 4

• can not be determined

Answer explanation

Pyrite has the chemical formula FeS2, which consists of 1 iron (Fe) atom and 2 sulfur (S) atoms. Therefore, to make pyrite, a total of 3 atoms (1 Fe + 2 S) are required, making the correct answer 3.

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NGSS.MS-PS1-1

How many atoms are in this molecule?

• 4

• 6

• 5

• 1

Answer explanation

The molecule contains 5 atoms in total, which can be counted by identifying each distinct atom present in its structure. Therefore, the correct answer is 5.

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NGSS.MS-PS1-1

Which atom is water (H₂O)?

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NGSS.MS-PS1-1

Which molecule is ethane (C₂H₆)?

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Which molecule contains the most chemical bonds?

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Which molecule is composed of two elements of the same element?

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NGSS.MS-PS1-1

Given the chemical formula H₂O, how many hydrogen atoms are present in one molecule?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

Which model correctly represents the compound PCl₃ ?

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NGSS.MS-PS1-1

How many atoms of each element are in:  H₂SO₄ ?

• 2 hydrogen, 1 sulfur, 4 oxygen
• 1 hydrogen, 2 sulfur, 4 oxygen
• 2 hydrogen & 4 sodium
• 1 hydrogen & 6 sodium

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NGSS.MS-PS1-1