7.PS1.2 Elements and Compounds

Select all of the options that are compounds.

• Neon (Ne)

• Ozone (O₃)

• Water (H₂O)

• Nitrogen (N₂)

• Ammonia (NH₃)

Tags

NGSS.MS-PS1-1

The diagram shows different structures. Each structure represents a molecule of a substance. Which table categorizes the structures as elemental or compound molecules?

• Table A categorizes the structures correctly.

• Table B categorizes the structures correctly.

• Table C categorizes the structures correctly.

• None of the tables categorize the structures correctly.

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NGSS.MS-PS1-1

Which chemical formula represents a diatomic molecule?

• CO₂

• 2C

• O₂

• 2CO₃

Model 1 and Model 2 represent two different molecules. Which model represents an elemental molecule, and why?

• Model 1; the model contains only two atoms.

• Model 1; the model has two different atoms.

• Model 2; the model has atoms of the same element.

• Model 2; the model contains at least three atoms.

Tags

NGSS.MS-PS1-1

Which two molecules are classified as compound molecules?

• ammonia

• hydrogen

• nitrogen

• ozone

• water

Tags

NGSS.MS-PS1-1

Which description correctly classifies the major and minor gases in the atmosphere?

• The major gases are diatomic molecules, and the minor gases are molecular compounds.

• The major gases are molecular compounds, and the minor gases are diatomic molecules.

• All of the gases are diatomic molecules.

• All of the gases are molecular compounds.

Which statement correctly compares CO₂ and N₂?

• CO₂ and N₂ are both compound molecules.

• CO₂ and N₂ are both elemental molecules.

• CO₂ is a compound molecule, and N₂ is an elemental molecule.

• CO₂ is an elemental molecule, and N₂ is a compound molecule.

Tags

NGSS.MS-PS1-1

Nitrogen naturally exists as a diatomic molecule. Which chemical formula represents a nitrogen molecule?

• A. N

• B. Nn

• C. N₂

• D. 2N

Tags

NGSS.MS-PS1-1

Which feature can distinguish between an elemental molecule and a compound molecule?

• whether the molecule is formed from at least two atoms

• whether the molecule is formed by the sharing of electrons

• whether the molecule is a gas or a liquid

• whether the molecule is made from different types of atoms

Tags

NGSS.MS-PS1-1

Based on the information in the table, which mineral is also an element?

• graphite

• quartz

• calcite

• hematite

Tags

NGSS.MS-PS1-1