Molecular Structure

Which of the following would be modeled by small particles made up of atoms of two kinds of elements?

• gold

• oxygen

• neon

• water

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NGSS.MS-PS1-1

Aspartame is an artificial sweetener; its formula is C₁₃H₁₆N₂O₅. What element in the formula has the most number of atoms?

• carbon

• hydrogen

• nitrogen

• oxygen

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NGSS.MS-PS1-1

How many atoms of hydrogen are in this compound?

• 1

• 2

• 3

• 4

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Choose all the correct answers.

• Atoms join together through bonds. These form molecules.

• The types of bonds between atoms can determine their properties.

• The structure/shape of a molecule can determine its properties.

• Molecules with ionic bonds will likely dissolve in water.

• Molecules can only be made of 1 type of atom.

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NGSS.MS-PS1-1

Which of the following best describes the structure of a water molecule?

• 2 oxygen atoms mixed with 1 hydrogen atom

• 2 hydrogen atoms mixed with 1 oxygen molecule

• 2 hydrogen atoms bonded with 1nitrogen atom

• 2 hydrogen atoms bonded to 1 oxygen atom

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NGSS.MS-PS1-1

What is this?

• Atom

• Molecule

• Compound

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How do scientists portray molecules in models?

• By using different colors for different elements

• By using spheres to represent atoms

• By using sticks to represent chemical bonds

• All of the above

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MS-PS1-1

What does this picture portray? Select all that apply.

• atom of an element

• elemental substance

• molecule of a compound

• Molecule

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NGSS.MS-PS1-1

A molecule of ethane is made of two carbon (C) atoms and six hydrogen (H) atoms. The carbon atoms are joined by a chemical bond. Each of the hydrogen atoms is joined to one of the carbon atoms by a chemical bond. Which is an accurate model of ethane?

• 
• 
• 
• 

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NGSS.MS-PS1-1

Which of the following represents a diatomic molecule?

• H₂O

• H₂

• NaCl

• CaCO₃

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NGSS.MS-PS1-1