1.3a Representations of Carbon Dioxide

In the formula CO2, what do the symbols C and O refer to?

• Carbon and Oxygen

• Calcium and Oxygen

• Carbon and Ozone

• Cobalt and Oxygen

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NGSS.MS-PS1-1

In the formula CO₂, what does the subscript 2 after the O mean?

• It indicates there are two oxygen atoms.

• It indicates there are two carbon atoms.

• It indicates the molecule is diatomic.

• It indicates the molecule is a compound.

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NGSS.MS-PS1-1

Another way to represent a substance is with a picture. What information does the picture provide about carbon dioxide?

• The molecular structure of carbon dioxide

• The color of carbon dioxide

• The taste of carbon dioxide

• The weight of carbon dioxide

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NGSS.MS-PS1-1

The word dioxide provides information about: (select 2)

• a type of sugar

• a type of gas

• a type of metal

• the amount of a particular element

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NGSS.MS-PS1-1

Self-Evaluation: How did you do? Rate your work on a scale of 1 to 5, with 5 as the highest score.

• 1

• 2

• 3

• 4

• 5

What is the role of carbon in the compound CO₂?

• It acts as a catalyst.

• It is a component of the molecule.

• It is a reactant.

• It is a product.

Which of the following best describes the term 'compound'?

• A mixture of elements

• A substance made of two or more elements chemically bonded

• A single element

• A type of molecule that is always gaseous

How many atoms are present in a single molecule of CO₂?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1

Explain the difference between a coefficient and a subscript.

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NGSS.MS-PS1-5