Junior Cert Science 2012 (HL & OL)

nickys

What percentage for the books you have already handed in???
Is it only 10% for everything so exam today was for 90%???
Thanks

DaleHyland

nickys wrote: »

What percentage for the books you have already handed in???
Is it only 10% for everything so exam today was for 90%???
Thanks

Experiments are 10% , investigations are 25% , so today was worth 65%

Troxck

lee3155 wrote: »

Darn, I said they warped because of the heat. Technically right yeah?

If you said it was warped because of heat, you might. I have no idea what the marking scheme is, none of us do!

Troxck

lee3155 wrote: »

You should definately. Remember you get a percent for your experiments copy alongside of your project which you filled in prior to the Junior Cert.

I say for the experiments and copy I got maybe around 27%. I tried my best and hopefully it pays back in September.

jackoismydog

i found the exam really easy, ive been studying for ages, it was great! im sure that i have gotten an A:)

Junokevv

Do you know the one with the biology experiment, could you use 2 separate leaves instead of covering one with a bit of tinfoil. I said cover one leaf with tinfoil and then later on in the experiment I said use another leaf that had no tinfoil on it. Is that still correct? Don't really see how it's wrong?

Junokevv

Do you know the one with the biology experiment, could you use 2 separate leaves instead of covering one with a bit of tinfoil. I said cover one leaf with tinfoil and then later on in the experiment I said use another leaf that had no tinfoil on it. Is that still correct? Don't really see how it's wrong?

harich56

I think you've got the wrong experiment. I'm pretty sure it was: 1 boil the leaf to kill it
2: Place leaf in beaker with methylated spirits (alcohol) to kill chlorophyll
3 place the leaf on a white tile
4. Add iodine to test for starch

Results: color change to blue/black

Mark !

harich56 wrote: »

I think you've got the wrong experiment. I'm pretty sure it was: 1 boil the leaf to kill it
2: Place leaf in beaker with methylated spirits (alcohol) to kill chlorophyll
3 place the leaf on a white tile
4. Add iodine to test for starch

Results: color change to blue/black

^^ I said that but I forgot it was iodine and said you had to use universal indicator. Think I'll get any marks?

harich56

You will definitely get marks!
Its done now I'm sure you did great!

Junokevv

harich56 wrote: »

I think you've got the wrong experiment. I'm pretty sure it was: 1 boil the leaf to kill it
2: Place leaf in beaker with methylated spirits (alcohol) to kill chlorophyll
3 place the leaf on a white tile
4. Add iodine to test for starch

Results: color change to blue/black

It's done differently in my book. It says that you put it in darkness to de-starch and cover one leaf in tinfoil.

Then take it out and put it in sunlight to re-starch but the leaf that was covered in tinfoil could not re-starch.

Take the leaf that had the tinfoil and any other leaf.

Then boil both leaves in alcohol to get rid of pigmentation.

Test for starch. Iodine turns blue/black on the one that was exposed to light and stays yellow on the leaf that was covered in tin foil.

This shows that the plant makes starch by photosynthesis.

If I wrote something like that, would I get many marks?

Mark !

harich56 wrote: »

You will definitely get marks!
Its done now I'm sure you did great!

Haha thanks, inspirational words you too.

harich56

^^ Thats Full Marks. Mine is just a simplified version.

Mark !

Carbon Dioxide test? couldn't think at all

harich56

This is what i put. I showed a test tube with air inside
1. Place limewater inside testube
2. Suck air in through tube.
3. Limewater turns milky cause Co2 is present

OwlYouNeed

What was the one in Physics about what the water molecules needed to evaporate? Was it heat?

Physics contained a lot of elecricity in my opinion. Chemistry and biology were grand though.

Oozamine

Junokevv wrote: »

Do you know the one with the biology experiment, could you use 2 separate leaves instead of covering one with a bit of tinfoil. I said cover one leaf with tinfoil and then later on in the experiment I said use another leaf that had no tinfoil on it. Is that still correct? Don't really see how it's wrong?

So basiclly you are just using the 2nd leaf as a control,should be ok in my opinion,wat do u think about the train track rusting as an answer :S

Troxck

Oozamine wrote: »

So basiclly you are just using the 2nd leaf as a control,should be ok in my opinion,wat do u think about the train track rusting as an answer :S

I wouldn't say rust because it was clearly "warped" due to the heat expanding it. Even if it was rust, it would more than likely be straight, sorry.

Troxck

Junokevv wrote: »

Do you know the one with the biology experiment, could you use 2 separate leaves instead of covering one with a bit of tinfoil. I said cover one leaf with tinfoil and then later on in the experiment I said use another leaf that had no tinfoil on it. Is that still correct? Don't really see how it's wrong?

I forgot to put in a control for this but I said that it didn't contain starch, the iodine wouldn't turn it dark blue. Is that okay?

Daledge

harich56 wrote: »

This is what i put. I showed a test tube with air inside
1. Place limewater inside testube
2. Suck air in through tube.
3. Limewater turns milky cause Co2 is present

I said the same thing except I said blow, wouldn't make much of a difference though would it?

Pen Rua

Overall, I feel I managed a B or so. It was an okay paper. Science isn't my strongest.

Upon hindsight, I really messed up some questions!

Sophieee

for the train tracks, i said rusting was the cause, will i get some marks?

EoghanIRL

Sophieee wrote: »

for the train tracks, i said rusting was the cause, will i get some marks?

the marking scheme has not been made yet so i do not think anyone can answer the question. I put rust down aswell because i thought that it was too warped to be heat expansion

AnnaTorvFan

quick q : were you supposed to get a set of log tables for that exam?

SweetCaliber

AnnaTorvFan wrote: »

quick q : were you supposed to get a set of log tables for that exam?

Nope, but they we're, well they should have been available on request from the superintendent.

My superintendent asked if we needed them and we all put up our hands so she just gave them out to all of us.

AnnaTorvFan

lee3155 wrote: »

Nope, but they we're, well they should have been available on request from the superintendent.

My superintendent asked if we needed them and we all put up our hands so she just gave them out to all of us.

Ohhh. :P
I figured we shoudn't have got them at all since most of Q4 was answerable after reading the back of them :P

Leinsterr

For the solubility of CO2 I said that when the heat was added the cO2 was evaporated so less CO2 could be dissolved. IS THIS RIGHT??????

EoghanIRL

for the question on the ldr i drew a circuit with a ldr battery and led is that ok?

nickys

Leinsterr wrote: »

For the solubility of CO2 I said that when the heat was added the cO2 was evaporated so less CO2 could be dissolved. IS THIS RIGHT??????

My daughter is really worried about physics
Can anyone help with answers for that section?

EoghanIRL

was the one with the straw refraction lads?