Counting Atoms in Chemical Reactions

Counting Atoms in Chemical Reactions

Assessment

Interactive Video

Created by

Olivia Brooks

Science

6th - 8th Grade

Hard

NGSS
MS-PS1-1

10:07

Standards-aligned

NGSS.MS-PS1-1
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.

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10 questions

Show all answers

1.

MULTIPLE CHOICE

30 sec • 1 pt

What does a subscript in a chemical formula indicate?

Tags

NGSS.MS-PS1-1

2.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

3.

MULTIPLE CHOICE

30 sec • 1 pt

What role does a coefficient play in a chemical formula?

4.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

5.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

8.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

9.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

10.

MULTIPLE CHOICE

30 sec • 1 pt

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

Tags

NGSS.MS-PS1-1

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