identify elements and atoms

Two students draw a model of a chemical reaction where two substances combine. They use black and white circles to represent different kinds of atoms. Which model is correct- Model A or Model B? Explain how you know.

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NGSS.MS-PS1-1

Count the number of ELEMENTS in the following chemical formula: NaOH

• 3
• 2

• 1

• 4

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NGSS.MS-PS1-1

Count the number of ELEMENTS in the following chemical formula: FeNO₃

• 3
• 2

• 5

• 4

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NGSS.MS-PS1-1

Count the number of ELEMENTS in the following chemical formula: C₆H₁₂O₆

• 3
• 4

• 24

• 6

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NGSS.MS-PS1-1

Count the number of ATOMS in the following chemical formula: CuNO₃

• 3

• 4

• 5

• 6

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NGSS.MS-PS1-1

Count the number of ATOMS in the following chemical formula: PbC₂H₅

• 3

• 4

• 8

• 9

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NGSS.MS-PS1-1

Count the number of ATOMS in the following chemical formula: 2H₂O

• 2

• 5

• 6

• 10

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NGSS.MS-PS1-1

Count the number of ATOMS in the following chemical formula: 2AgNO₃

• 3

• 5

• 6

• 10

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NGSS.MS-PS1-1

Count the number of ELEMENTS in the following chemical formula: O₃

• 1
• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

Count the number of ATOMS in the following chemical formula: C₂H₂O₂

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1