Writing chemical equations 2

• Chemistry
• Secondary Education

TEMPLATE

Topic 6 - Formulae and equations

Balancing chemical equations

17 November 2025

How do you feel today?

😒🙁😐🙂😃

TEMPLATE

• I will know how to balance chemical equations.
• I will understand how the law of conservation of mass applies to balancing equations.
• I will be able to write word and balanced symbol equations.

Period 1 / Practice.

Work in pairs:

Do Activities 8 & 9
LAP Sheets

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What does the Law of Conservation of Mass say about you?

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What does the Law of Conservation of Mass say about you?

What does the Law of Conservation of Mass say about you?

TEMPLATE

Work in groups:

Modelling chemical reactions

Option 1: Solid sodium reacts with chlorine gas to form solid sodium chloride.

Option 2: Methane gas reacts with oxygen gas to form carbon dioxide and water.

Option 3: Solid magnesium reacts with an aqueous solution of hydrochloric acid to form aqueous magnesium chloride and hydrogen gas.

Option 4: Nitrogen gas reacts with hydrogen gas to form liquid ammonia.

In your activity, was there a change in the number of a specific atom from the reactants to the products?

TEMPLATE

No atoms are lost or gained during a chemical reaction – all the atoms in the reactants are there in the products.

Option 1: Solid sodium reacts with chlorine gas to form solid sodium chloride.

W.E.      sodium  +  chlorine  →  sodium chloride

S.E.         Na (s)  +  Cl₂ (g)  →  NaCl (s)           ___ balanced  ___ unbalanced

Balancing      _ Na (s)  +  _ Cl₂ (g)  →  _ NaCl (s)

TEMPLATE

No atoms are lost or gained during a chemical reaction – all the atoms in the reactants are there in the products.

W.E.     methane +  oxygen  →  carbon dioxide + water

S.E.  CH₄ (g)  +  O₂ (g)  →  CO₂ (g)  + H₂O(l)       ___ balanced  ___ unbalanced

Balancing     _ CH₄ (g) +  _ O₂ (g) →  _ CO₂ (g) +  _ H₂O(l) 

Option 2: Methane gas reacts with oxygen gas to form carbon dioxide and water.

TEMPLATE

Work in pairs:

Do Activity 9 - Balancing Equations in your LAP sheets (Questions 1 to 7)

TEMPLATE

• I will know how to balance chemical equations.
• I will understand how the law of conservation of mass applies to balancing equations.
• I will be able to write word and balanced symbol equations.

How well did you participate
in the lesson today?

05

TEMPLATE

Assesses student comprehension through a worksheet, quiz, a lab report, or a concluding class discussion.