Unit 9 Element, Compound, Molecule

What is a molecule?

• A molecule is a type of rock formation.
• A molecule is a group of atoms bonded together.
• A molecule is a unit of measurement for weight.
• A molecule is a type of plant species.

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NGSS.MS-PS1-1

What is an atom?

• An atom is a type of musical instrument
• An atom is a unit of time measurement
• An atom is a type of fruit
• An atom is the smallest unit of matter that retains the properties of an element.

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NGSS.MS-PS1-1

What is a molecular element?

• A molecular element is a compound made up of different types of atoms.
• A molecular element is a substance that cannot exist in nature.
• A molecular element is a type of molecule.
• A molecular element is a substance made up of only one type of atom.

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NGSS.MS-PS1-1

What is a compound?

• A compound is a mixture of two or more chemical elements
• A compound is a substance formed when two or more chemical elements are chemically bonded together.
• A compound is a substance formed by physical mixing of elements
• A compound is a substance formed by a single chemical element

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NGSS.MS-PS1-1

What does the coefficient in a chemical formula represent?

• Number of electrons in the substance
• Molecular weight of the substance
• Volume of the substance
• Number of molecules of the substance

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NGSS.MS-PS1-5

In a chemical formula, what do the subscripts represent?

• Number of atoms of each element
• Charge of each element
• Number of molecules of each element
• Atomic number of each element

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NGSS.MS-PS1-1

NGSS.MS-PS1-5