VCAA APPROVED CHEM DEFINITIONS

[Elizawei]

Hey everyone! 

Hope you're all enjoying chem revision! woooo hyyyyyype   _okay.
Anyways I got inspired by Heidi's awesome vcaa approved bio definitions and decided to make one for chem! _{Probably the only notes I've actually made this year XD}

Went through all exam reports from 1993-2015 and picked out the definition of terms and also included some direct recall questions
Because it's straight from the VCAA examiner reports, if we use these definitions and answers there is no way they can mark us wrong _huehuehue 


Happy Studying and good luck for exams! Let's go and ace it



Mods, would you be able to chuck this in the chem resource thread? Thanks <3

[ciaran3105]

You're a champion! 

[sweetiepi]

Hey everyone! 

Hope you're all enjoying chem revision! woooo hyyyyyype   _okay.
Anyways I got inspired by Heidi's awesome vcaa approved bio definitions and decided to make one for chem! _{Probably the only notes I've actually made this year XD}

Went through all exam reports from 1993-2015 and picked out the definition of terms and also included some direct recall questions
Because it's straight from the VCAA examiner reports, if we use these definitions and answers there is no way they can mark us wrong _huehuehue 


Happy Studying and good luck for exams! Let's go and ace it
(Image removed from quote.)


Mods, would you be able to chuck this in the chem resource thread? Thanks <3

A well deserved "you're a legend" is in order!!

[breja]

Simply the best - Thank you!

[Elizawei]

No probs guys! <3
Oh yeah feel free to add in more stuff or suggestions to make it better

[elhoysted]

Just with this bit:

Why does changing the pH from the optimum value cause a decrease in the activity of the enzyme?
• the tertiary structure of the enzyme changes with change in pH
• change in [H+] may change the charge on side chain groups (thus affecting interactions between Z groups that determine the tertiary structure)
• the enzyme is denatured so the shape of the active site changes. (2010)

I've seen on other parts of the chem forum that pH may disrupt the secondary structure as well, and I've also seen people who say that it does not so I'm a bit lost. If this comes up on Tuesday I'll use this answer if its in a similar context (aka denaturing enzymes) , I was just wondering if someone could explain exactly why the secondary structure is/isn't disrupted by pH, just in case VCAA frame the question so it doesn't relate to the functioning of enzymes?

[Elizawei]

I've seen on other parts of the chem forum that pH may disrupt the secondary structure as well

Hahaha I actually said it myself in the 3/4 chem thread XD
Yeah pH definitely changes the secondary structure as well.

low pH ( the increased H+ ions) may interfere with the hydrogen bonds, by displacing the atoms within the hydrogen bond.

Secondary structure is stabilised by hydrogen bonds between the backbone carboxyl and amino groups in the protein. If you increase the number of protons in a solution, these bonds are disrupted.

However, that is "too bio" for chemistry, and since the question was asking for the effect on "activity of the enzyme" it's more to do with the tertiary structure of the enzyme (its active site), and how pH disrupts that. I highly doubt that they'd ever ask a question about enzymes that isn't to do with their activity.

[elhoysted]

Thank you for that