Counting Atoms in Chemical Reactions

The video tutorial covers the basics of chemical bonding, focusing on how to count atoms in a chemical formula. It explains the role of subscripts and coefficients, providing examples and practice problems to reinforce understanding. The tutorial also addresses more complex molecules involving parentheses and multiple coefficients, guiding students through the process of calculating total atoms in various scenarios.

What does a subscript in a chemical formula indicate?

• Number of atoms of each element

• Number of bonds

• Number of molecules

• Type of chemical reaction

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NGSS.MS-PS1-1

If a chemical formula has no subscript next to an element, how many atoms of that element are present?

• It varies

• 2

• 1

• 0

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NGSS.MS-PS1-1

What role does a coefficient play in a chemical formula?

• Indicates the type of elements involved

• Indicates the phase of the compound

• Indicates the number of molecules

• Indicates the number of bonds

How do you calculate the total number of atoms in a molecule using subscripts and coefficients?

• Multiply subscripts by coefficients

• Divide coefficients by subscripts

• Subtract coefficients from subscripts

• Add subscripts and coefficients

Tags

NGSS.MS-PS1-1

In the formula 'P2O3', how many phosphorus atoms are present?

• 1

• 5

• 3

• 2

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NGSS.MS-PS1-1

In a compound with the formula 'NO3' inside parentheses followed by a subscript '2', how many oxygen atoms are there?

• 3

• 5

• 2

• 6

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NGSS.MS-PS1-1

For a molecule '4Zn(NO3)2', how many total nitrogen atoms are present?

• 8

• 4

• 16

• 2

Tags

NGSS.MS-PS1-1

How many total atoms are in '4Zn(NO3)2'?

• 36

• 48

• 24

• 12

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NGSS.MS-PS1-1

In the formula 'Sr3(PO4)2', how many total atoms are present?

• 8

• 5

• 10

• 13

Tags

NGSS.MS-PS1-1

How many total atoms are in the molecule with the formula '2NH4NO3'?

• 32

• 24

• 8

• 16

Tags

NGSS.MS-PS1-1