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Leaving Certificate Chemistry [All Levels] Before and After Discussion

plmko

A good few days to go yet but Chemistry is on our horizons people!

-Predictions for the experiment questions?

-Will it be a tough paper?

-What should we look over?

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robman60

EoghanIRL wrote: »

Q3 (f) is the answer that the rate of reaction is decreased by 1/2 because sodium thiosulfate is the limiting reagent and rate of reaction is affected by concentration ?

I wasn't sure, but I said it reduced the rate of the reaction. I was going to say it halved it, but that would mean they were directly proportional (straight line through origin), but they were only proportional, not directly I think.

matthew8

robman60 wrote: »

I wasn't sure, but I said it reduced the rate of the reaction. I was going to say it halved it, but that would mean they were directly proportional (straight line through origin), but they were only proportional, not directly I think.

For concentration it is a linear relationship so half would've been right.

randylonghorn

Caolan wrote: »

Same reason they make you do a foreign language - most of the 3rd level courses demand a science and european language (not all)

it doesnt make sense when your 17/18 and are focused on something that doesnt need it- but as someone who didnt do a science at LC- it closes alot of doors later in life should you wish to apply for many courses.

In fairness, a large amount of courses in colleges DON'T require a science. A language requirement is more common, especially in the NUI.

I agree with you that it closes some doors, but for a small minority of students those doors aren't a realistic prospect anyway ... they have no interest in or aptitude for sciences, and will struggle with them even at Junior Cert, let alone Leaving Cert.

I would certainly agree with schools strongly encouraging students to keep on a science for LC, and to keep their options open, but a school making it completely mandatory to my mind is a step too far. It actually ends up disadvantaging those students with no aptitude for them when it comes to points etc., as they are carrying a subject that they constantly struggle with and which they never wanted in the first place.

Mahmoudsaid_1

can anyone solve this equilibrium question?
10 moles of nitrogen and 30 moles of hydrogen were mixed and allowed to come to equilibrium in a sealed 5 litre vessel. There were 15 moles of ammonia in the vessel at equilibrium. Find the number of moles of hydrogen and nitrogen present in equilibrium and hence find Kc
N2 + 3H2 -> 2NH3

ko3p

Mahmoudsaid_1 wrote: »

can anyone solve this equilibrium question?
10 moles of nitrogen and 30 moles of hydrogen were mixed and allowed to come to equilibrium in a sealed 5 litre vessel. There were 15 moles of ammonia in the vessel at equilibrium. Find the number of moles of hydrogen and nitrogen present in equilibrium and hence find Kc
N2 + 3H2 -> 2NH3

Here you are: i.imgur(dot)com/EkyU6hR.jpg?1