http://www.sciencejoywagon.com/physicszone/otherpub/wfendt/refraction.htm
http://www.lon-capa.org/~mmp/kap25/Snell/app.htm
What ray can you vary?
What is the law of reflection?
What is refraction (Compared to reflection)?
How much does the material effect refraction?
Wednesday, September 16, 2009
Wednesday, September 2, 2009
Monday, August 31, 2009
Sunday, August 23, 2009
Revision Chemistry MC Answer 2
The correct formulae for nitric acid is
Nitric implies the a Nitrogen atom involved.
Acid are ionic compounds, where H+ is acting as a metal. The proton gets detached and floats around in solution. Acids are identified if they begin with a H. (exception is Water H20 and Peroxide H202 which arent acids)
a) NH3
This is the formula for ammonia gas, when it dissolves in your nasal mucus it is a strong irritant.
b) H2CO3
This is the formula for Carbolic Acid, it is basically made when CO2 dissolves in water H2O by sticking to water. It is commonly found in coke. It is an acid and the H+ and CO3-- ions separate when put in water , just like a salt, only we call H+ an acid.The H in the front as tells you it is an acid.
c) N2
THis is formula for Nitrogen gas, and makes up 80% of the air we breath.
d) HNO3
This is the formula for nitric acid. The H in the front as tells you it is an acid.
Nitric implies the a Nitrogen atom involved.
Acid are ionic compounds, where H+ is acting as a metal. The proton gets detached and floats around in solution. Acids are identified if they begin with a H. (exception is Water H20 and Peroxide H202 which arent acids)
a) NH3
This is the formula for ammonia gas, when it dissolves in your nasal mucus it is a strong irritant.
b) H2CO3
This is the formula for Carbolic Acid, it is basically made when CO2 dissolves in water H2O by sticking to water. It is commonly found in coke. It is an acid and the H+ and CO3-- ions separate when put in water , just like a salt, only we call H+ an acid.The H in the front as tells you it is an acid.
c) N2
THis is formula for Nitrogen gas, and makes up 80% of the air we breath.
d) HNO3
This is the formula for nitric acid. The H in the front as tells you it is an acid.
Revision Chemistry MC Answer 1
Exothermic, like extrovert, means gives out heat (Thermic). Endothermic means taking in or absorbin heat
An exothermic reaction (can):
a) Releases heat
Heat is the total vibration energy of all the particles in a solid. In general this is true, however you can get a reaction that liberates pure light and no heat.
b) Liberates Energy
This means that chemical potential energy stored through the arrangement of atoms is reduced and converted to other forms of energy.
c) Produces and increase in temperature of the surroundings
In general this is true you can measure an exothermic reaction produces a rise in temperature. The exception would be say the generation of steam from liquid water, here the temperature of stays the same.
d) all of the above
In general all of the above answers are correct.
An exothermic reaction (can):
a) Releases heat
Heat is the total vibration energy of all the particles in a solid. In general this is true, however you can get a reaction that liberates pure light and no heat.
b) Liberates Energy
This means that chemical potential energy stored through the arrangement of atoms is reduced and converted to other forms of energy.
c) Produces and increase in temperature of the surroundings
In general this is true you can measure an exothermic reaction produces a rise in temperature. The exception would be say the generation of steam from liquid water, here the temperature of stays the same.
d) all of the above
In general all of the above answers are correct.
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About Me
- drhill
- I come from a Science family: My father Geoffrey Hill was Australia's first computer programmer on CSIRAC the fourth computer in the world. He is credited with invention of Computer music and the development of “Interprogram” a language before Basic. My PhD is in Atomic and Molecular Physics. I have researched the activated oxygen layer above the ozone layer, and 'Assigned' the world's smallest molecule. At the University of Toronto I researched high power UV lasers. I have specialized in automation in fibre optics. This developed into research in Machine Intellect and Robots. I have enjoyed work as an Explainer with Questacon and my time as a part-time soldier. I currently teach High School Science at Epping Boys’ High.