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Which of the following best describes the relationship between O₂ and CO₂?

• Both are elements.

• CO₂ is an element, while O₂ is a compound.

• O₂ is a molecule made of one type of element, while CO₂ is a compound.

• O₂ and CO₂ are both compounds.

Tags

NGSS.MS-PS1-1

How many types of elements are in the chemical formula HClO₃?

• A. 2

• B. 3

• C. 4

• D. 5

Tags

NGSS.MS-PS1-1

In the formula for glucose (C₆H₁₂O₆), how many different elements are present?

• 1

• 2

• 3

• 6

Tags

NGSS.MS-PS1-1

Acetone (C₃H₆O) is used in nail polish remover. How many carbon atoms are present in one molecule of acetone?

• A. 2

• B. 3

• C. 6

• D. 1

Tags

NGSS.MS-PS1-1

Which of the following represent compounds? (Select two)

• H₂

• CO

• Na

• H₂O

Tags

NGSS.MS-PS1-1

Which correctly lists two elements? (Select two)

• A. H₂O and NaCl

• B. O₂ and N₂

• C. CO₂ and NaCl

• D. H₂ and B

What classification best describes a molecule of H₂O?

• Element

• Mixture

• Compound

• Solution

Tags

NGSS.MS-PS1-1

What supports the idea that water (H₂O) is a compound?

• It can dissolve many substances.

• It is composed of more than one type of element.

• It is a mixture of gases.

• It exists as a liquid at room temperature.

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are in the molecule NH₃?

• 1

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

Which formula represents a substance made of only one type of element?

• CO₂

• O₂

• H₂O

• NaCl