Prelim 2015 Chit Chat Thread (4 Viewers)

Status
Not open for further replies.

MilkyCat_

Active Member
Joined
Oct 3, 2014
Messages
602
Gender
Female
HSC
2016
In the equation they have the same molar ratio
Number of moles of chalcopyrite=1000000/183.54
=5448.4 moles
Therefore number of moles of copper=5448.4
5448.4=mass of copper/63.55
Therefore mass of copper=346246.05g
=346.25kg


Hope I'm right lol
 

Ambility

Active Member
Joined
Dec 22, 2014
Messages
336
Gender
Male
HSC
2016
In the equation they have the same molar ratio
Number of moles of chalcopyrite=1000000/183.54
=5448.4 moles
Therefore number of moles of copper=5448.4
5448.4=mass of copper/63.55
Therefore mass of copper=346246.05g
=346.25kg


Hope I'm right lol
That is correct!

Next question! (chemistry again):
Identify the missing products, then balance the equation:
 

Ambility

Active Member
Joined
Dec 22, 2014
Messages
336
Gender
Male
HSC
2016
I didn't know this reaction before now
Yeah an acid plus a carbonate always gives salt, water and carbon dioxide.

DatAtarLyfe, I'm working on your question. I can get the first two parts out, but the last one is giving me trouble.
 

Ambility

Active Member
Joined
Dec 22, 2014
Messages
336
Gender
Male
HSC
2016
It's getting late, I'm just going to dump my working, tell me if I got close.







So as you can see, I can only get a circle with radius root 2ay. I don't know how you'd get a circle with radius a.
 

rand_althor

Active Member
Joined
May 16, 2015
Messages
554
Gender
Male
HSC
2015
So as you can see, I can only get a circle with radius root 2ay. I don't know how you'd get a circle with radius a.
You're pretty close. The radius is a constant term (it doesn't involve y) so it isn't . What would you do if you were required to change to the general equation of a circle?
 

Ambility

Active Member
Joined
Dec 22, 2014
Messages
336
Gender
Male
HSC
2016
You're pretty close. The radius is a constant term (it doesn't involve y) so it isn't . What would you do if you were required to change to the general equation of a circle?
Thank you! I would complete the square!



I guess I better post another question, though I can't be bothered finding one, so I'm making this up on the fly. I believe it is possible.

PHYSICS: A car travelling at 40km/h west collides with a van travelling at 75km/h east. The resultant wreck travels eastbound at 10km/h. If the van's mass was 1500kg, what was the mass of the car?
 
Last edited:

Graceuf

Member
Joined
Feb 21, 2015
Messages
252
Location
Hunter Valley
Gender
Female
HSC
2016
Should I be concerned that half of that maths stuff just went over my head?

Although I'm fairly sure we're doing Locus Week 10 after exams.
 
Status
Not open for further replies.

Users Who Are Viewing This Thread (Users: 0, Guests: 4)

Top