C2 I wrote silver nitrate solutions and and sodium carbonate solution and base ( insoluble) for the last one, can someone pls tell me if that is right?

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Reply 1305

tman24

there was an question about how 50cm3 of dilute hcl will be the same as 25cm3 of hcl in terms of temperature change

Reply 1306

nellythumper

Original post by neil20143

I made a prediction list of what I think will come in C2 if it'll help!:
-Diamond & Graphite
-Nanoparticles
-Thermosetting & Thermosoftening polymers
-Catalysts
-Electroplating? (not sure about this one :/ )
-Salts
-Empirical Formula (hasn't come up very recently so it's very likely)
-Simple Molecules (Why is Carbon Dioxide a gas at room temperature or something like this)

Is that the salts and electrolysis questions? For this I made a little mind map, colour coded each section so that I could differentiate each bit! That helped me understand what links with what. Then I just had to memorize it :frown:

If that's your main problem

Wow, amazing prediction.

Reply 1307

SmashedIt

Original post by tman24

there was an question about how 50cm3 of dilute hcl will be the same as 25cm3 of hcl in terms of temperature change

it was the sodium hydroxide not hcl
hard question that was

Reply 1308

PawanAviator

Original post by Positivedani

SOMEONE ANSWER
What was the question on C3 - the last question- asking about the mass? What was the exact question?

i put the fact that the sodium hydroxide was no an independent variable , and the fact that the values of the graph will change but have similar proportion to the graph of results meaning the difference in both temperatures(start and end) will be the same as the graph

the question asked about changing the amount of sodium hydroxide not affecting the graph of results and having the same difference. something along the lines to that.

(edited 8 years ago)

Reply 1309

username1740341

Original post by LoganF

Yeah I got 50cm + 25 too.

It was asking for mass at peak temperatire therefore, 20+25=55
55*4.2*(38-18)

Reply 1310

camz01

Original post by SSAA9

C2 I wrote silver nitrate solutions and and sodium carbonate solution and base ( insoluble) for the last one, can someone pls tell me if that is right?

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They are all right

Reply 1311

SSAA9

Original post by camz01

They are all right

Even with 'solutions' in the answer?

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Reply 1312

username1942323

Original post by kevinspl2000

im in year 10 im doing unit 1 2 and 3 of biology and chemistry. Im doing physics next year. I really hope for 2 A*'s however i am ambivalent as to whether I will actuarly get this. what colledge are you applying to?

My school does not work like that we do unit 1 in year 9, unit 2 in year 10 and unit 3 in rear 11 but am doing both unit 1 sciences and unit 2 sciences in year 10 because i want to do unit 3 next year ( i have not been entered for science exams in year 9 but i thought i was. This made me so angry when everyone else got their results but not me so my teacher said i could do unit 2 as well cause i knew my unit 1 stuff)

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Reply 1313

camz01

Original post by SSAA9

Even with 'solutions' in the answer?

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Yes, they will probably just ignore that because you still got the actual name right

Reply 1314

LoganF

Original post by Rit101

She already had 25cm^2 in the beaker.
She added 50cm^2 total into the beaker also. (This is not the peak, as she added excess. Basically on the end of the xaxis).
OVERALL temp change was 10.

So (25+50) x 4.2 x 10 =
3150 J

Oh thats were I went wrong then, I forgot she added excess. But I would still get marks for doing the equations with the right numbers that I got.