Chemistry: The fun science
Chemical Calculations
How can we calculate how much reactants we need?
Previously...
You've learnt how to write balanced chemical equations.
But how can we calculate how much reactant is needed or how much product is formed in a reaction using the chemical equation?
Let's Explore!
There are so many atoms, it's hard for us to calculate the actual number of atoms or molecules in a reaction. Hence, we calculate atoms in moles. But how many atoms make up one mole? Watch this video to find out!

What do we mean when we say a reactant is limiting? Play with this simulation to find out!
Why do we care so much about moles? Watch this YouTube video to find out more!
What do we mean by concentration? How can we make a solution more concentrated?
In the simulation below, try adding as much solute as you can and observe the concentration.
Then, try increasing or decreasing the volume of water.
How can we calculate concentration? Watch this YouTube Video to find out more!