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Validity of the experiment: Our experimental procedure tested the hypothesis and found the concentration of sulfate ions in the fertilizer. Thus it appears to be valid. However this meant that; we assume each step of the procedure was perfect e.g. the entire sulfate was precipitated and...

What is the relationship between them?

I had to do this prac in class and our results were very very off. We had a diference of about 5% from the original results. I don't know what went wrong?? I know we spilled about 2 drops but it wasn't enough to affect the results this substantially. I know that I stirred the mixture...

We did a prac in class today where we Put Barium chloride and copper sulphate solutions together and added a couple of drops of HNO3 and in another test tube put them together and added a couple of drops of NaOH. The only one where they reacted to form Barium sulphate was the acidic one. So...

The method that our teacher gave us says the following: 1. Weigh 1 g of fertilizer 2. Add it in 250 mL of 0.1M/L HCl and stir to dissolve as much as possible 3. Filter of insoluble material Why do we filter it after adding the HCl? And also why do we add HCl in the first place?

Can you use good foreign movies as related texts in English;if they are in another language and you only understand them through subtitles? Does it get marked down? or is it even allowed?

Which economics textbook is the best according to you? I have Tim Riley from school but I hate it. It's just too annoying for me.

My English teacher told us to start looking for ideas that we could use for belonging in our HSC and this is what I'm thinking of doing: A woman is getting ready to go to a marriage. The wedding is of her ex-fiancee. She is feeling quite sad because she thought he was the one etc. She feels...

I am getting confused about the pleistocene era. It says on the internet that Australian climate kept alternating from wet phases to dry phases. But it says that the vegetation did not change much and rainforests were confined to one area; wheras central Australia was dominated by dry forests...

I am thinking about dropping extension maths in year 12. I got 15/25 in the last test and passed by 4 marks in the midterms. Also my class is on the same time as my SOR class but since I was really keen on doing Extension; the head teacher allowed me to do it. I don't know if I could cope with...

We measured the heat of solution for 2 salts. The result for salt 1 was 13 kj/mol while the actual result from the data table is supposed to be 15kj/mol. The second salt was also off the actual value by 17 kj/mol The experiment was repeated using the same equipment Is it reliable??

SO far I have: Repeat the experiment Put more insulating material outside the Styrofoam cup that we used Take extra care while reading the meniscus of the measuring cylinder Are any of these correct? Can someone tell me some more? Thanks

We just started Electricity at home and our teacher gave us a very complicated circuit question that involved factorization, quadratic formula and simultaneous equations. It was really hard and time consuming. Most people didn't get it. I was wondering if we could be asked questions like that...

So we recently started doing electricity at home in Physics and our teacher gave us this weird and complicated circuit question. She showed us a way to do it which involved simultaneous equations and the quadratic formula. It was really hard to understand and took a whole lesson. Are these kind...

2H2O2--> 2H2O + O2 The enthalpy for the reactant is 2144 Kj/mol and for the product is 1424 Kj/mol.

Hi Guys. Currently I am doing: Physics Chemistry Bio 3U Maths Mod history Economics Adv English The problem is that I am absolutely hating physics. I really don't seem to understand whats happening in class at all. My teacher isn't very helpful either. She is more of a visual person. She just...