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  290 GCSE Level Chemistry questions
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chemistry

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

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reliability of conclusion

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

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Esters

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

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Is Aspirin Still A Wonder Drug Or Is It Overrated?

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

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non metallic oxides are neutral and acidic?

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

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rates of reation

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!

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Hydrochloric acid concentration affecting the reaction rate

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

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halogen derivatives of alkanes

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

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Chemical Equations

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)

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Data Logging Procedure As Extension For Sodium Thiosulphate And Hydrochloric Acid Reaction

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

  290 GCSE Level Chemistry questions
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Stoichiometric Calculations

Contributors:
lilly prasad

Difficulty: Hard | Reward: 6 SZPoints

Status: Unanswered | Comments: 2

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Is Aspirin Still a wonder drug?

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Difficulty: Very Hard | Reward: 12 SZPoints

Status: Unanswered | Comments: 0

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Ionic and Covalent

Contributors:
Choon Lim Adefunke b

Difficulty: Hard | Reward: 6 SZPoints

Status: Unanswered | Comments: 3

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Is aspirin still a wonder drug or is it

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Difficulty: Very Hard | Reward: 12 SZPoints

Status: Unanswered | Comments: 0

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equations

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tajwar

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 1

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Structures And Bonding.

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David David Flora David Flora

Difficulty: Very Hard | Reward: 12 SZPoints

Status: Answered | Comments: 5

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rate of reactions on temperature

Contributors:
Stevyn joe1_ sohail Malaz

Difficulty: Hard | Reward: 6 SZPoints

Status: Answered | Comments: 4

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Rates of Reaction

Contributors:
Louise Abdullah lilly Louise Miriam

Difficulty: Average | Reward: 3 SZPoints

Status: Answered | Comments: 5