Counting Atoms in Chemical Formulas

What does a subscript in a chemical formula indicate?

• Total number of elements in the compound

• Number of atoms of the element it follows

• Number of electrons

• Number of molecules

If a chemical symbol has no subscript, how many atoms of that element are present?

• One

• It varies

• Zero

• Two

What role does a coefficient play in a chemical formula?

• None of the above

• Indicates the number of electrons

• Applies to the entire compound

• Indicates the number of protons

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NGSS.MS-PS1-5

In the formula for water, H2O, how many hydrogen atoms are present?

• Four

• Three

• Two

• One

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NGSS.MS-PS1-1

How many oxygen atoms are in lithium sulfate, Li2SO4?

• Four

• Five

• Three

• Two

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NGSS.MS-PS1-1

In ty trihydrate, if the formula shows a coefficient and a subscript, how many hydrogens are there?

• Nine

• Two

• Three

• Six

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NGSS.MS-PS1-1

What is the total number of atoms in ty trihydrate?

• Fifteen

• Twelve

• Nine

• Six

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NGSS.MS-PS1-1

In aluminum sulfate, how many sulfur atoms are indicated by the formula?

• Four

• Three

• One

• Two

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NGSS.MS-PS1-1

How many oxygen atoms are there in aluminum sulfate?

• Three

• Twelve

• Six

• Nine

Tags

NGSS.MS-PS1-1

What is the total number of atoms in aluminum sulfate?

• Ten

• Fifteen

• Seventeen

• Twenty

Tags

NGSS.MS-PS1-1