Kaupapa: 01 / 06 Thursday Learn how to write chemical equations

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Presentation transcript:

Kaupapa: 01 / 06 Thursday Learn how to write chemical equations Learn how to interpret chemical formulae

Do you remember? What is the difference between a chemical change and a physical change? What are the some things you can observe in chemical changes? Define a chemical reaction

Do you remember? What is the symbol for this element? What element does this symbol represent?

1. Iron nail in copper sulfate solution

2. Heating up sugar

3. Heating up egg white

4. Heating up a piece of chocolate

5. Potassium iodide + Lead nitrate

6. Magnesium + Hydrochloric acid

7. Baking soda + Vinegar

Writing Chemical Equations and Interpreting Chemical Formulae

Chemical Equations For every chemical reaction, you should be able to write chemical equations for it. A typical chemical equation looks like this:

Question: How is a chemical equation different from a mathematical equation?

Question: How is a chemical equation different from a mathematical equation? An arrow must be used instead of an equal sign. There can be any number of reactants and products. “+” sign does not necessarily mean “adding”. It could mean “and”.

Example 1: Iron in copper sulfate solution When an iron nail is added to a beaker of copper sulfate solution, two new substances were formed – copper metal and iron sulfate solution. Write a word equation. Write a symbol equation.

Example 2: Magnesium in HCl When a piece of magnesium is added to hydrochloric acid in a test tube, it produced magnesium hydroxide and hydrogen gas. Write a word equation. Write a symbol equation.

Example 3: Combustion of hydrogen gas Hydrogen gas has been collected in a test tube and then brought to a flame. It reacted with oxygen in the air to produce water, with an audible “pop”. Write a word equation. Write a symbol equation.

Example 4: Burning magnesium A small piece of magnesium metal was burnt in the air to produce white magnesium oxide powder. Write a word equation. Write a symbol equation.

Sodium Chloride (salt) Chemical Formulae Name Chemical Formula Water Oxygen gas Carbon dioxide Sodium Chloride (salt) Hydrochloric acid Sulfuric acid *Calcium hydroxide

Interpreting Formulae Chemical Formula Atomic Composition H2O O2 CO2 NaCl HCl H2SO4 *Ca(OH)2

Are you up to the challenge? Chemical Formula Atomic Composition NaHCO3 CH3COOH Al(OH)3 Na2SO4 Ca(NO3)2 (NH4)2CO2 Al2(SO4)3

What have we learnt today? NaOH C3H7OH Fe(OH)3