Chemical Changes and Equations

Name: Chemical Changes and Equations
Author: StemPy Lab

When you burn a candle, or leave a cut apple in the air, a chemical change takes place. In this course we learn how to tell that a reaction has taken place, how to write it as an equation, and how to balance the equation.

3 lessons, about 1 h 15 min3 simulations10 problems6 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 25 min
Chemical reactions and how we spot them
In a chemical reaction, the reactants change into new substances, the products. We can often tell that a reaction has taken place from a change of state, a change of colour, a gas given out, a change of temperature, or a solid that forms.
1 simulation2 practice questions1 Python program3 problems
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Lesson 2about 25 min
Writing a chemical equation
A chemical equation shows a reaction with formulae. A word equation uses the names of the reactants and products, and a skeletal equation uses the formulae but is not yet balanced. The reactants are on the left, the products on the right, and the arrow means gives. State symbols show the state, (s), (l), (g) and (aq), and conditions such as heat, light or a catalyst are written over the arrow. Never change a formula to balance an equation, and for brackets, the number outside multiplies all the atoms inside.
1 simulation2 practice questions1 Python program3 problems1 Python lab
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Lesson 3about 25 min
Balancing a chemical equation
An equation must be balanced, with the same number of atoms of each element on both sides, because atoms are not made or destroyed. We balance by putting whole-number coefficients in front of the formulae, never by changing a formula.
1 simulation2 practice questions1 Python program4 problems1 Python lab1 question set1 note
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Chemical Equations: Practice Paper

15 questions · 20 min

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Chemical Changes and Equations

Course outline (3 lessons)

Chemical reactions and how we spot them

Writing a chemical equation

Balancing a chemical equation

Test Your Learning

Your teacher

Discussion (0)

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