The Physics and Chemistry Technicalities Thread (1 Viewer)

[barbernator]

Post things here that people commonly lose simple marks on for just missing out on the finer details.

For starters:

- Rounding to the same significant figures as the lowest provided information you used in the calculation. However, for pH calculations, the pH is rounded to as many decimal places as there are significant figures in molarity of Hydronium ions.

- HSC markers want water to be stated as a liquid in combustion reactions.

- Correct units

they are some simple ones but please post any more so people can minimise their silly mistakes in the test.

 

[deswa1]

This is a fantastic idea for a thread. As I think of stuff, I'll post it. First off, is it poly(ethylene) or polyethylene or does it not matter?

For graphs, make sure you use AT LEAST 80% of both axis, you'll get docked if you don't. Put a title on it and make sure you have a line of best fit, excluding outliers

 

[barbernator]

i think you can do either, however with polychloroethene, poly(1-chloroethene) is better as it denotes a uniform spacing of chlorine in the polymer.



T0 is the rest frame, i.e. the frame in which the observer is in. Tv is the inertial frame with a relative velocity to the observer. To remember this, think 0 is no velocity and V is velocity


The HSC physics course deals with special relativity mainly

 

[deswa1]

For chemistry, make sure you draw the bonds to the correct thing if that makes sense. For example, this is wrong:

You MUST draw the bond to the oxygen not the hydrogen.

When naming things, there are NO spaces between words. You put commas between the numbers and dashes between the numbers and the words. When naming isomers, electronegativity no longer applies (even though it still says this in Conquering Chemistry)- IUPAC rules changed in 2005 and Jacaranda chem has the correct rules but Conq. Chem is outdated here.

 

[barbernator]

For chemistry, make sure you draw the bonds to the correct thing if that makes sense. For example, this is wrong:

You MUST draw the bond to the oxygen not the hydrogen.

When naming things, there are NO spaces between words. You put commas between the numbers and dashes between the numbers and the words. When naming isomers, electronegativity no longer applies (even though it still says this in Conquering Chemistry)- IUPAC rules changed in 2005 and Jacaranda chem has the correct rules but Conq. Chem is outdated here.

So how do they choose to name if the numbers are equal either way?

 

[nightweaver066]

So how do they choose to name if the numbers are equal either way?

It's by alphabetical order now.

Also, styrene is called phenyl ethene OR ethenyl benzene.

 

[barbernator]

It's by alphabetical order now.

Also, styrene is called phenyl ethene OR ethenyl benzene.

ahk sweet

 

[SpiralFlex]

Vectors = Magnitude + Direction

Enufsaid.

You'd be surprised at how many marks can be lost due to technicalities.