why does the purple colour spread when potassium manganete is added to water?

in my chemistry courswork i need to write a paragraph on "judging the relyability of your conclusion" and i do not know what to put

Hey, Im having trouble trying to grasp the concept of esters. Can you help?

I need help with my course work, is aspirin still a wonder drug or is it overated?

How are non metallic oxides neutral and acidic?
Can you give me examples with chemical equations?
And how are metallic oxides basic?? Examples please.

hi i need help with OCR's 21st centrury science chemistrycoursework, i need write up the effect on the effects rate of reaction with concentation On hydrochloric acid and magnesium i've done some however i'm missing the context however i have no idea what to write, please help, also i'm struggleing on what to write for the preliminary conclusion aswell as what to write for control and range. please answer back soon because it is due soon. thank you!

Hi
I am doing a science coursework investigating hw concentration of hydrochloric acid affects the rate of reaction between hydrochloric acid itself and sodium thiosulphate. I do OCR 21st century additional science and the mark scheme says that to get high marks for my interpretation, my line graph (reaction time and concentration in molar) should have an equation. I can find an equation but what do I do with it? Please help! Also, I have dome my coursework and I want to upload it but does this mean that everyone can see it? Thanks

what is the general representation of primary alkyl halides? (monohalogen derivatives)

Write a chemical equation (with state symbols) for:

1) The converstion of anhydrous copper sulphate to hydrated copper sulphate.
Ans: ?

2) The precipitation reaction between silver nitrate solution and sodium chloride solution.
Ans: AgNO3(aq)+2NaCl(aq)=AgCl2(s)+2NaNO3(aq)

3) Sodium chloride dissolving in water
Ans: NaCl(g)=Na+(aq) + Cl-(aq)

4) The precipitation reaction between calcium chloride and sodium carbonate solutions.
Ans: Na2CO3(aq)+CaCl2(aq)=2NaCl(s)+CaNO3(aq)

I am doing my coursework on 'Factors affecting the rate of reaction between sodium thiosulphate and hydrchloric acid'. I chose to vary the concentration of sodium thiosulphate using the paper with a cross that disappears method. For my extension i have to describe another method of measuring the rate of reaction and my teacher suggesting a data logging procedure using a light reciever. I was wondering if you could enlighten me as to the method of using this pricedure with this reaction as i have searched through my school books and the internet extensively and have been unable to find anything relevant. Thankyou(:
.xoxo