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# Balancing chemical equations

## Why are we going to learn these skills?

This lesson is by Lynda Jones. It was originally on a website, balancingequations.info, but that website no longer exists.

Example 1:

….

## Nor can you represent “2 RW2” as “R2W4.”

So the balanced equation is:

## Example 2

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### And how do we get 6 atoms of white on the left hand side? Yes, by adding groups. What is the total number of groups we need on the left to balance the 6 whites on the right?

So now we have another correctly balanced equation.

## Example 3

Review:

### 4. P.S. You ALWAYS want the lowest possible numbers.

Go to this game: Balance all 10 equations. Write the balanced equation.

Balancing act: Jefferson Lab

Go to this game: Balance all 11 equations. Write the balanced equations

Chembalancer from FunBasedLearning

Balancing Chemical Equations

Chemistryland teaches all about balancing equations

Online alternate texbook Chap 4: Chemical Rxns and Balancing equations

## Learning Standards

Massachusetts Science Tech Curriculum Frameworks

HS-PS1-7. Use mathematical representations and provide experimental evidence to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. Use the mole concept and proportional relationships to evaluate the quantities (masses or moles) of specific reactants needed in order to obtain a specific amount of product.

College Board Standards For Success in Science

C-PE.1.4.5 Given a simple chemical reaction (e.g., synthesis of water, decomposition of hydrogen peroxide, combustion of methane)

C-PE.1.4.5a Write a balanced chemical reaction.

C-PE.2.3.1 Construct a balanced symbolic representation, based on given reactants and products, of a chemical reaction. Construct a molecular-level representation of the chemical reaction, and explain, using the concept of atoms, why matter is conserved during any change.