Counting Atoms: Molecular Structure

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

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DOK Level 1: Recall

How many hydrogen atoms are in a single molecule of water (H₂O)?

• 1

• 2

• 3

• 4

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DOK Level 1: Recall

Which of the following is a simple molecule?

• NaCl

• C₆H₁₂O₆

• H₂O

• C₂H₅OH

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DOK Level 2: Skill/Concept

• MgCl

• MgCl₂

• Mg₂Cl

• Mg₂Cl₂

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DOK Level 2: Skill/Concept

Identify the number of oxygen atoms in 3CO₂.

• 3

• 6

• 9

• 12

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DOK Level 2: Skill/Concept

Which of the following best describes a molecule?

• A single atom

• A group of atoms bonded together

• A mixture of different elements

• A pure element

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DOK Level 2: Skill/Concept

Draw a simple model to represent the molecular structure of methane (CH₄).

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NGSS.MS-PS1-1

Explain how the atomic composition of a molecule affects its properties.

• The number of atoms determines the molecule's color

• The types and arrangement of atoms determine the molecule's properties

• The atomic composition has no effect on the molecule's properties

• The atomic composition only affects the molecule's size

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DOK Level 3: Strategic Thinking

Develop a model to describe the atomic composition of a simple molecule like ammonia (NH₃).

• A nitrogen atom with three hydrogen atoms bonded to it

• Three nitrogen atoms bonded to one hydrogen atom

• A linear chain of nitrogen and hydrogen atoms

• A ring structure of nitrogen and hydrogen atoms

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DOK Level 3: Strategic Thinking

How does the structure of a molecule like H₂O differ from that of O₂?

• H₂O is a compound, while O₂ is an element

• H₂O is a linear molecule, while O₂ is bent

• H₂O has a bent structure, while O₂ is linear

• H₂O and O₂ have the same structure

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DOK Level 3: Strategic Thinking