Chemical Reactions
Chemical Reactions is an important Chemistry topic for students who want a quick, reliable study reference.
This guide explains the meaning, core idea, common uses, and exam relevance of Chemical Reactions in simple language. Use it for class revision, homework support, project preparation, and quick concept recall before tests.
When studying this topic, first understand the definition, then connect it with examples from textbooks, classroom notes, and everyday situations. Write the key points in your own words and revise them with related SaralStudy resources.
- Read the concept carefully and note the keywords.
- Practise one or two examples after reading.
- Use related pages to revise connected topics.
Chemical Reactions: Explanation, Formulae and Practice
Chemistry revision should combine definitions, balanced equations, observations and small numerical relations where applicable.
Useful Formulae and Rules
- Number of moles = given mass / molar mass.
- Concentration = amount of solute / volume of solution.
- For reactions, balance atoms on both sides of the equation.
- Acids have pH below 7, bases have pH above 7, and neutral solutions have pH 7.
Solved Example
Question: Find moles in 18 g of water. Molar mass of water = 18 g/mol.
Working: Moles = mass / molar mass = 18 / 18.
Result: Number of moles = 1 mol.
Unanswered Practice Questions
Try these yourself before checking notes or calculators.
- Balance: H2 + O2 -> H2O.
- Classify lemon juice, soap solution and pure water as acidic, basic or neutral.
- Find moles in 44 g of carbon dioxide if molar mass is 44 g/mol.
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