When finely powdered magnesium is added to hydrochloric acid, it violently reacts, producing magnesium chloride and hydrogen gas.

1. Write down the word equation

2. Write down the balanced symbol equation

3. Is this a combination reaction or not? Explain your answer.

When iron filings are mixed with sulfur powder and heated, they react with a bright red glow, producing a dark brown substance – known as iron sulfide.1. Write down the word equation for this

reaction2. Write down the symbol equation3. Define combination reaction4. Describe why the above reaction is a

combination reaction

Find the unbalanced equations, then balance them.1. C + H2O → CO + H2

2. Mg + O2 → MgO

3. CH4 + O2 → CO2 + H2O

4. CuO + H2 → Cu + H2O

5. Mg + H2O → Mg(OH)2 + H2

6. Fe2O3 + CO → Fe + CO2

7. C2H6 + O2 → CO2 + H2O

2 2 2 2

2 7 4 6

2 3 2 3

1. Write down the formula for:a) Sodium Chlorideb) Sodium Carbonatec) Iron (II) Sulfided) Iron (II) Sulfatee) Magnesium Oxidef) Aluminium Oxide

2. Balance the following equation:Cu + O2 → CuO

Question:What is the chemical name of “salt”?

Sodium Chloride (NaCl)

Sodium Metal

Chlorine Gas

+

= ???

Combination Reaction• It is a type of reaction in which two or

more substances “chemically” combine to produce a single substance.

• A + B → AB• The product most often has different

properties from those of the reactants.

Aluminium + Iodine = Aluminium Iodide

Example: Iron & Sulfur

Iron Sulfur Iron Sulfide

Magnetic Non-magnetic

Sinks in water

Floats on water

Black Yellow

Example: Iron & Sulfur

Iron Sulfur Iron Sulfide

Magnetic Non-magnetic

Non-magnetic

Sinks in water

Floats on water

Sinks in water

Black Yellow Brown

Practical – Zinc & Sulfur Method Prediction – word equation, reason(s) Results – detailed observations Conclusion• word equation• balanced symbol equation• type of reaction + reason(s)• comment on the initial prediction