NSG 2020 questions I got wrong - could someone please walk me through them? (1 Viewer)

[nsw..wollongong]

pre sure u cant say that..
adding a solid has no effect on eqm right

so u just instead mention common ion effect ig

what but the MgSO4 thing like wait how do i include equations in here



here, solid dissociation

 

[SadCeliac]

I accelerated chemistry in year 10, no problem at all.

jesus christ that's insane - how did you go??? what are you doing for hsc now??

 

[nsw..wollongong]

what but the MgSO4 thing like wait how do i include equations in here

View attachment 39164

here, solid dissociation

it wouldn't be common ion effect bc ur just adding more of the magnesium sulfate solid (that has the radioactive stuff in it, isotope i think), ur not adding another different substance

 

[bigman19191]

jesus christ that's insane - how did you go??? what are you doing for hsc now??

I got a 95 in chem and now I've only got ext 2 maths and adv eng to do.

 

[SadCeliac]

thanks guys

please stick around im so close to getting to the end of the paper

ffs guys I keep getting 80% - how do I improve

 

[synthesisFR]

it wouldn't be common ion effect bc ur just adding more of the magnesium sulfate solid (that has the radioactive stuff in it, isotope i think), ur not adding another different substance

theres just 2 common ions in this case?

 

[SadCeliac]

I got a 95 in chem and now I've only got ext 2 maths and adv eng to do.

thats damn insane

you are gonna fly this year - good luck

 

[synthesisFR]

ffs guys I keep getting 80% - how do I improve

if ur school does CSSA trials do past ones there

 

[bigman19191]

ffs guys I keep getting 80% - how do I improve

80% is quite solid, especially for a school like nsg. A raw mark of 83 usually aligns to a band 6 in the hsc, so you still have plenty of time to improve

 

[bigman19191]

thats damn insane

you are gonna fly this year - good luck

thank you, you too

 

[nsw..wollongong]

ffs guys I keep getting 80% - how do I improve

considering they're mistakes that are pretty easy to fix over a short amt of time, its not like ur totally clueless abt the content. u got this

 

[SadCeliac]

Question 8:

Ethanol and methanoic acid will reflux to produce ethyl methanoate (an ester). You should first write out an equation for this

Determine the number of moles of both ethanol and methanoic acid. This can be done by using n = m/MM
n(ethanol) = 3.50g / 46.068 g/mol = 0.07597 mol
n(methanoic acid) = 5.75g / 60.052g/mol = 0.09575 mol
Ethanol is the limiting reagent meaning it gets used up completely.
Therefore, the n(ethyl methanoate) = 0.07597 mol since they are in a 1:1 stoichiometry ratio

Now you can calculate the mass of the product extracted
m(ethyl methanoate) = 0.07597 mol x 74.078 g/mol = 5.63g

However, the mass was found to be 24% of the expected result
So 5.63g x 0.24 = 1.35g

I just went over this - is methanoic acid not HCOOH, which has a mm of 46??

 

[synthesisFR]

considering they're mistakes that are pretty easy to fix over a short amt of time, its not like ur totally clueless abt the content. u got this

he is the mistake tho

 

[nsw..wollongong]

he is the mistake tho

speak for urself

 

[SadCeliac]

he is the mistake tho

yeah look nothing i can do about that unfortunately. do your parents still have your receipt?

 

[nsw..wollongong]

yeah look nothing i can do about that unfortunately. do your parents still have your receipt?

ud think they woulda returned him by now

 

[SadCeliac]

I just went over this - is methanoic acid not HCOOH, which has a mm of 46??

^^^ @bigman19191

 

[bigman19191]

I just went over this - is methanoic acid not HCOOH, which has a mm of 46??

oh oops, yeah you're correct. The answer does not change tho but good spot

 

[synthesisFR]

ud think they woulda returned him by now

Inflammation: Occurs when injured cells release chemokines. This attracts neutrophils and also acts on mast cells, causing them to release histamine. Mast cells alert the body after detecting foreign material, releasing chemical signals and blood is rushed to the area, bringing white blood cells. Dilation of blood vessels and infiltration of inflammatory cells at the site of infection causes heat, pain, redness, swelling, and the acute loss of function. When tissues are damaged, they release histamines which increase permeability of proximal blood vessels and allow WBCs to travel more easily to the site. The purpose of inflammation is to eliminate the cause of injury (the pathogen), clear out necrotic cells from the area of infection, and initiate tissue repair by stimulating the flow of blood to the area. By heating the area, pathogens are subjected to higher temperatures which may deactivate them due to their enzymes, stopping infection. Increased temperature enhances activity of white blood cells.

 

[SadCeliac]

Inflammation: Occurs when injured cells release chemokines. This attracts neutrophils and also acts on mast cells, causing them to release histamine. Mast cells alert the body after detecting foreign material, releasing chemical signals and blood is rushed to the area, bringing white blood cells. Dilation of blood vessels and infiltration of inflammatory cells at the site of infection causes heat, pain, redness, swelling, and the acute loss of function. When tissues are damaged, they release histamines which increase permeability of proximal blood vessels and allow WBCs to travel more easily to the site. The purpose of inflammation is to eliminate the cause of injury (the pathogen), clear out necrotic cells from the area of infection, and initiate tissue repair by stimulating the flow of blood to the area. By heating the area, pathogens are subjected to higher temperatures which may deactivate them due to their enzymes, stopping infection. Increased temperature enhances activity of white blood cells.

can i plagarise this for bio <3