Balancing Chemical Equations: An Introduction

Balancing Chemical Equations: An Introduction

Assessment

Interactive Video

Science

9th - 12th Grade

Hard

NGSS
MS-PS1-5, MS-PS1-1

Standards-aligned

Created by

Sophia Harris

FREE Resource

Standards-aligned

NGSS.MS-PS1-5
,
NGSS.MS-PS1-1
This video tutorial covers the process of balancing chemical equations, emphasizing the law of conservation of mass. It explains the difference between coefficients and subscripts, using a humorous example to illustrate the importance of subscripts. The tutorial provides a detailed walkthrough of balancing equations, including examples with sodium and chlorine, and encourages practice to master the skill.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What principle states that the number of atoms must remain constant before and after a chemical reaction?

Law of Conservation of Mass

Law of Multiple Proportions

Avogadro's Law

Law of Definite Proportions

Tags

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What can be changed to balance a chemical equation?

Chemical symbols

Coefficients

Reaction conditions

Subscripts

Tags

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the reaction Na + Cl2 -> NaCl, what must be done to balance the chlorine atoms?

Decrease chlorine atoms on the product side

Change the subscript of Cl

Increase sodium atoms on the reactant side

Add a coefficient before Cl2

Tags

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When balancing the equation for the reaction of sulfur and oxygen, what is the correct coefficient for oxygen to balance the equation?

8

3

12

2

Tags

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of incorrectly balancing a chemical equation?

Faster reaction rates

Creation of new elements

Violation of the law of conservation of mass

Decreased product yield

Tags

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for sodium phosphate when balancing charges?

Na4P2O8

NaPO4

Na3PO4

Na2PO4

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the reaction of iron 3 oxide, what is the correct formula for the compound?

FeO3

Fe3O2

FeO2

Fe2O3

Tags

NGSS.MS-PS1-1

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