Chemistry Predictions/Thoughts (5 Viewers)

[C2H6O]

mf r u telling me the last time u took ur exam was like more than two weeks ago?

nein, 12 days ago

 

[Trial&Error]

Bruh. Tell me why I'm sitting here less than 24hrs before THE HSC EXAM and still finding new things I didn't know existed?? Now what in the actual heck is a cross link and how does it make polymers nonbiodegradable?

 

[Baliistic]

Bruh. Tell me why I'm sitting here less than 24hrs before THE HSC EXAM and still finding new things I didn't know existed?? Now what in the actual heck is a cross link and how does it make polymers nonbiodegradable?

DONT tell me that I have no idea what youre talking about

 

[nowomansland]

Bruh. Tell me why I'm sitting here less than 24hrs before THE HSC EXAM and still finding new things I didn't know existed?? Now what in the actual heck is a cross link and how does it make polymers nonbiodegradable?

hello what

 

[eternallyboreduser]

wait guys why do bigger compounds release more energy when combustrf again

 

[melanie_o]

If there is a question which has something needing to find concentration of H^+ such as 10^-3.8, can we use that value to ensure that there isn't a rounding error?

 

[chikki7]

If there is a question which has something needing to find concentration of H^+ such as 10^-3.8, can we use that value to ensure that there isn't a rounding error?

yes just make sure its put normally for ur final answer

 

[Trial&Error]

If there is a question which has something needing to find concentration of H^+ such as 10^-3.8, can we use that value to ensure that there isn't a rounding error?

If you're asking if you can use 10^-3.8 in subsequent calculations within the same question, then yes, but don't give it as your final answer. Use the correct number of sigfig in the final answer.

And when using the value for subsequent parts of the question, like part b for example, then use your rounded answer from part a.

 

[Trial&Error]

wait guys why do bigger compounds release more energy when combustrf again

Combustion is exothermic, meaning the bond formation releases more energy, than it takes to break the bonds. As the compound gets larger, more CO2 and H2O are produced and thus more bonds are formed, and hence more energy is released.

 

[nowomansland]

wait guys why do bigger compounds release more energy when combustrf again

more bonds to break and form

 

[thatnerdyhylian]

Bruh. Tell me why I'm sitting here less than 24hrs before THE HSC EXAM and still finding new things I didn't know existed?? Now what in the actual heck is a cross link and how does it make polymers nonbiodegradable?

Cross links are bonds (usually covalent) between polymer chains which make the polymer more rigid

 

[C2H6O]

Bruh. Tell me why I'm sitting here less than 24hrs before THE HSC EXAM and still finding new things I didn't know existed?? Now what in the actual heck is a cross link and how does it make polymers nonbiodegradable?

wait that makes it biodegradable??

 

[Trial&Error]

wait that makes it biodegradable??

non-biodegradable I think

 

[thatnerdyhylian]

Well synthetic addition polymers usually aren't biodegradable anyway

 

[melanie_o]

Also, what's the general 'rule of thumb' for significant figures in our final answer?

 

[nowomansland]

Also, what's the general 'rule of thumb' for significant figures in our final answer?

the least amount of sig figs in the question but when ur answering for pH the sig figs are only after the decimal point

 

[C2H6O]

the least amount of sig figs in the question but when ur answering for pH the sig figs are only after the decimal point

had a q from 2024 give "1L" and that was technically used in the calculation to find concentration, would you guys say to give in 3sf (the rest of values were 3sf) or 1sf (bc 1 is 1sf, they didnt give 1.00L)

 

[BionicMango]

had a q from 2024 give "1L" and that was technically used in the calculation to find concentration, would you guys say to give in 3sf (the rest of values were 3sf) or 1sf (bc 1 is 1sf, they didnt give 1.00L)

If I see something in 1sf, then just give it in 2sf

What I have been taught is in the hsc, do the lowest number of sig figs unless it is just 1 sf, then just do 2 sf to avoid annoyances.

 

[nowomansland]

had a q from 2024 give "1L" and that was technically used in the calculation to find concentration, would you guys say to give in 3sf (the rest of values were 3sf) or 1sf (bc 1 is 1sf, they didnt give 1.00L)

this is my problem w sig figs everyone has diff opinions but the hsc only has 1-2 questions where sig figs are necessary to get full marks and for those the number of sig figs are usually obvious so i would say dont worry too much abt it

 

[BionicMango]

Also for some reason textbooks ALWAYS get sig figs wrong what is up with that