Preparing Salts 2 Metal Carbonates WALT Explain what

Preparing Salts 2 – Metal Carbonates WALT – Explain what is formed when a metal carbonate is added to an acid WILF – Questions answered Prepare for practical Carry out practical

Previously … METAL + OXYGEN METAL OXIDE

METAL + WATER METAL OXIDE + HYDROGEN METAL HYDROXIDE + HYDROGEN

METAL + ACID SALT + HYDROGEN

And today ….

The reaction between acids and metal carbonates � When an acid reacts with a metal carbonate, a salt, water and carbon dioxide are produced:

�Acid + metal carbonate salt + H 2 O + CO 2 sulphuric acid + zinc carbonate zinc sulfate +H 2 O + CO 2

Small is beautiful!- particle size � WALT – Explain how Particle size affects the rate of reactions � � WILF – Complete expt. With conclusions and evaluations

Which one will dissolve quicker and why ? ? ? � Discuss with your neighbour

� When the particle is LARGE there is only a small surface area for the reactions � Small particles have lots of surface for reactions to take place

Large Marble Chip � Can Small Marble Chip you draw this in your books? � Add an explanation in your own words

� When the particle is LARGE there is only a small surface area for the reactions � Small particles have lots of surface for reactions to take place

Using : Calcium Carbonate + HCl = Calcium Chloride + CO 2 + H 2 O) � Half of the class will use marble chips (Calcium Carbonate ) � Half will use powdered Calcium Carbonate

� Weigh out 2 grams of each � Add them to 15 ml HCl which has also been weighed, recording the time it takes to dissolve them.

Marble Chips Ca. CO 3 Time Taken to Dissolve (seconds)

1) 2) 3) Place beaker on balance, press Zero. Add 2 gm of Ca. CO 3 We