Dissecting a cows eye

Science (ICAS) 2013 Competition

ICAS in Science is a is a skills based  Science Literacy assessment that is completed by over a million students from over 6,300 schools in Australia and New Zealand annually.  Why should you enter?

• Fun and challenging competition
• Great for CV
• Gives you an indication of skill on a national level
• HVHS students have traditionally preformed very well. 
• All students can participate - Y9 to Y13

Students sit the assessment on the 5th June, however if you want to enter you need to hand in permission slip with $8.50 to the resource centre by Friday 3rd May

Find out more here

Phenolphthalein indicator and dry ice bubbles

Click on this link to see what happens when you add the indicator Phenolphthalein to an acid or a base.
Watch cool bubble formed from Carbon Dioxide gas given off by dry ice.
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Dry ice bubbles and Universal Indicator with 10AE

As part of the pHizzing topic 10 AE and 10 SU explored the properties of dry ice. We looked at change of state and sublimation, density of carbon dioxide, and how carbon dioxide can be used to extinguish fires (in fire extinguishers).
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In this clip we see the colour change produced by the neutralisation of a known base (Ammonia diluted in water) as dry ice dissolves in water producing a weak acid (Carbonic acid). We also make 'dry ice bubbles'

Baking Powder and Baking Soda....what's the difference?

Both of these raising agents contain a carbonate (Sodium Bicarbonate) which behaves in a predictable way when reacted with an ACID.

The general reaction
ACID + CARBONATE ----> METAL SALT + WATER + CARBON DIOXIDE.

It is the carbon dioxide gas that produces bubbles of air that makes the mixture rise. Click on this link to find out more.

Parts of an eye

Click here to see an online dissection so that you are familiar with the parts and function of the eye

Y10 Revision Guide - Mr Waring's Model Answers

Click on the following link to access model answers provided my Mr Waring