VCE Chemistry Question Thread

[PolySquared]

...

Thanks

what about the second question?

mod edit: merged posts

[TheAspiringDoc]

n=m/M
n=5/2
Thus 2.5 mol of H₂ in 5g of H₂

Maybe we need a 1/2 chem thread?

[coolkat3378]

Purpose: To calculate the change in heat energy accompanying several physical processes.  (with: NH4Cl, NaOH, CaCl2, KNO3, MgSO4)

method: 1. Measure 100ml of distilled water and record its temp.
              2. weigh 5g of one of the solids in a clean, dry polystyrene cup and record its weight
              3. add distilled water to the cup and stir the solution while recording the temp. Record the max temp.
 
1)What sources of error would occur in this experiment (systematic and random)?
2) How would i calculate delta H (enthalpy change) from this experiment?
 

[carol1234567890]

if there is a reaction between copper oxide and sulfuric acid
the products will be copper sulfate and water
but what state is the water , liquid or gas?

[mcd0008]

Does anyone have study notes for Unit 3 AoS 1?

[sweetiepi]

Does anyone have study notes for Unit 3 AoS 1?

Hey and welcome to the forum!
Best bet is to search the notes here: atarnotes.com/notes!

[mcd0008]

I can't find any which are correct. I need unit 3 AoS 1 notes But none in there are of the current design

[carol1234567890]

I can't find any which are correct. I need unit 3 AoS 1 notes But none in there are of the current design

I've sent you a message about Chemistry notes

[011116]

stuffed up first (practical sac part a= didnt pass) feeling like shit, am i still able to achieve a 35 study score and how can i study for chemistry idrk how to soo please help 

[Bri MT]

stuffed up first (practical sac part a= didnt pass) feeling like shit, am i still able to achieve a 35 study score and how can i study for chemistry idrk how to soo please help 

You will need to demonstrate to your teacher that you can meet the outcome & discuss how to achieve that with them and yes, it is still possible to achieve a 35 study score.

You might be interested in this article: https://atarnotes.com/sac-results/
I'd also recommend you check out these threads:
 - Chemistry Resources, it's a stickied thread so very easy to find: https://atarnotes.com/forum/index.php?topic=128626.0
 - Vaike's Guide to VCE chemistry: https://atarnotes.com/forum/index.php?topic=176367.0
- This set of links to heaps of useful threads for VCE: https://atarnotes.com/forum/index.php?topic=171255.0

[lazaward]

stuffed up first (practical sac part a= didnt pass) feeling like shit, am i still able to achieve a 35 study score and how can i study for chemistry idrk how to soo please help 

It’s just one sac, still definitely possible to achieve a 35 study score. I find with practical sacs I spend a lot of my time going home and doing research into the experiment and really getting my head around it. Annotate your instruction sheet with possible experimental errors, safety precautions and the IV/DV. After that, I read over my pre-made notes based on the study design dot points, but make sure to write your notes at least a week prior to your sac so you’re not stressing out about it beforehand. Then once I’ve memorised my notes, which I do by talking to myself out loud I do the end of chapter questions to consolidate my understanding. I then like to do some past exam questions to really test myself and then around about a day before the actual sac I just lightly read over my notes and go over any mistakes I made while practicing some questions. This is how I personally study for chem, but do what works for you!

[-_-zzz]

Hey guys just wondering if anyone knows how to do this question:

4.150g of tungsten (W) was burned in chlorine (Cl) and 8.950g of tungsten chloride (WCl6) was formed. Find the relative atomic mass of tungsten.

Cheers.

[TheBigC]

Hey guys just wondering if anyone knows how to do this question:

4.150g of tungsten (W) was burned in chlorine (Cl) and 8.950g of tungsten chloride (WCl6) was formed. Find the relative atomic mass of tungsten.

Cheers.

I am making the assumption that information of the molar mass of chlorine was specified (M = 35.50g per mol)
So, initially, we can formulate an equation (excluding states):

W + 3Cl2 --> WCl6

We have 4.150g of W, as well as, ultimately, 8.950g of WCl6, thence, using n = m/M

4.150g/M(W) = 8.950g/(M(W)+M(Cl)*6) (As a 1:1 ratio of tungsten to tungsten chloride exists)

Cross-multiplying, we get:

4.150g * (M(W) + 35.50*6) = 8.950g * (M(W))

therefore, algebraically transposing to solve for M(W):

8.950(M(W)) - 4.150(M(W)) = 35.50*6*4.150

Thus, using a calculator M(W) = 184.156. (which is pretty close to the periodic table value )

[lzxnl]

I am making the assumption that information of the molar mass of chlorine was specified (M = 35.50g per mol)
So, initially, we can formulate an equation (excluding states):

W + 3Cl2 --> WCl6

We have 4.150g of W, as well as, ultimately, 8.950g of WCl6, thence, using n = m/M

4.150g/M(W) = 8.950g/(M(W)+M(Cl)*6) (As a 1:1 ratio of tungsten to tungsten chloride exists)

Cross-multiplying, we get:

4.150g * (M(W) + 35.50*6) = 8.950g * (M(W))

therefore, algebraically transposing to solve for M(W):

8.950(M(W)) - 4.150(M(W)) = 35.50*6*4.150

Thus, using a calculator M(W) = 184.156. (which is pretty close to the periodic table value )

You don't need to assume information about molar masses; all assessments give you the periodic table. ALL of them.

[daniel.h]

Hey all,

I'm new to ATARNotes and I have some redox, galvanic and fuel cells questions.

1st attachment: isn't the answer supposed to be C?

2nd attachment: Do we need to know what "stainless steel backing", "carbon black to act as an organic electrolyte" or what a "button battery" is?

3rd attachment: Does it matter that DILUTE HCL is added? Would the answer be different if concentrated HCL was added?

4th attachment: I understand that B is correct, but can someone explain D? What does D mean and why it is correct?