Balancing Chemical Equations

Balancing Chemical Equations

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Ethan Morris

FREE Resource

The video tutorial demonstrates how to balance the chemical equation for the decomposition of potassium bromate (KBrO3) into potassium bromide (KBr) and oxygen gas (O2). It begins by counting the atoms on each side of the equation and highlights the challenge of balancing an odd number of oxygen atoms. The instructor then explains the process of multiplying KBrO3 by two to achieve an even number of oxygen atoms, making it easier to balance the equation. The tutorial concludes with the final steps to balance potassium and bromine atoms, resulting in a balanced chemical equation.

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9 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the initial chemical equation discussed in the video?

KBrO3 -> KBr + O2

KBrO3 -> K + Br2 + O2

KBrO3 -> KBrO + O2

KBrO3 -> KBr + O3

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many oxygen atoms are present on the product side initially?

Four

Three

Two

One

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step taken to balance the oxygen atoms?

Add more O2

Multiply KBrO3 by two

Multiply O2 by three

Add more KBrO3

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After multiplying KBrO3 by two, how many oxygen atoms are on the reactant side?

Five

Seven

Four

Six

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What coefficient is placed in front of O2 to balance the oxygen atoms?

Four

Three

Two

One

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the imbalance of potassium and bromine atoms corrected?

By adding more KBr

By multiplying KBr by two

By adding more KBrO3

By multiplying KBrO3 by three

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the final balanced equation for the decomposition of potassium bromate?

2 KBrO3 -> KBr + 2 O2

KBrO3 -> KBr + O2

KBrO3 -> 2 KBr + 3 O2

2 KBrO3 -> 2 KBr + 3 O2

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the key trick mentioned for balancing equations with odd-numbered oxygen atoms?

Add more reactants

Convert odd numbers to even

Use fractional coefficients

Ignore the imbalance

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Who is the narrator of the video?

Dr. D

Dr. C

Dr. A

Dr. B