Balancing Chemical Equations Challenge

This video tutorial covers the topic of balancing chemical equations, emphasizing the law of conservation of mass. It explains why equations need to be balanced and provides a step-by-step guide to doing so. The tutorial includes several practice problems, demonstrating how to balance equations with different elements and polyatomic ions. It concludes with tips for handling tricky components like H2 and O2.

Why is it important to balance chemical equations?

• To make the equations look neat

• To comply with the law of conservation of mass

• To increase the number of products

• To ensure the reactants are heavier than the products

Tags

NGSS.MS-PS1-5

What is the first step in balancing a chemical equation?

• Change the subscripts of the molecules

• Count the number of atoms of each element on both sides

• Add coefficients to the products

• Remove any excess reactants

In the example with hydrogen and oxygen, what coefficient is added to balance the oxygen atoms?

• 4

• 3

• 1

• 2

Tags

NGSS.MS-PS1-5

When balancing the equation with sulfur and oxygen, what coefficient is added in front of SO2 to balance the oxygen atoms?

• 8

• 10

• 4

• 6

Tags

NGSS.MS-PS1-5

How many total oxygen atoms are there after balancing the equation with sulfur and oxygen?

• 12

• 16

• 14

• 8

Tags

NGSS.MS-PS1-5

What is a polyatomic ion?

• An ion with a single charge

• An ion with multiple atoms

• An ion with only one atom

• An ion that cannot be balanced

In the example with CO3, what coefficient is added to balance the carbonate ions?

• 4

• 1

• 2

• 3

Tags

NGSS.MS-PS1-5

After balancing the polyatomic ions, what is the next step?

• Change the subscripts of the molecules

• Remove excess products

• Balance the remaining individual elements

• Add more reactants

What is a useful tip for balancing equations involving H2 and O2?

• Change their subscripts

• Ignore them

• Balance them first

• Balance them last

In the final practice problem, what is the coefficient added in front of NO3 to balance it?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5