Top answers

All subjects
GCSE

Solve the simultaneous equations 5x+y=21 and x-2y=9

To answer this, you need to try and remove on of the letters from the equation. You could multiply the first equation by 2 so that the number in front of the y's are the same in both equations, with 10x+2...

JW
Answered by Jess W. Maths tutor
3132 Views

Describe the principles of how paper chromatography works

Paper chromatography separates a mixture of solutions by their various solubilities. The less soluble components have a higher affinity to the stationary phase (the paper strip) while more soluble compone...

RD
Answered by Rebekah D. Chemistry tutor
3236 Views

How does a vaccination work?

To start we need to ask: what causes an infection? The answer is a pathogen, which is a microbe that causes disease. These can be bacteria or viruses. A vaccine contains dead or inactive pathogens that ar...

JS
Answered by Jessica S. Biology tutor
2027 Views

An equation for the reaction is: NiO + C = Ni + CO Calculate the percentage atom economy for the reaction to produce nickel. Relative atomic masses (Ar): C = 12 Ni = 59 Relative formula mass (Mr): NiO = 75 Give your answer to 3 significant figures.


Atom economy is a percentage value which tells you how efficient the product is in comparison to the amount of reactant used.Equation to learn: atom economy = Ar of useful product/A...

PR
3104 Views

Donnez-moi une brève description de vos dernières vacances d’été et ce que vous avez fait

...

OJ
Answered by Ollie J. French tutor
1525 Views

We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences