Top answers

When and how do you use "Passé Composé" ?

Passé Composé is a past tense used to talk about a completed action that has already been done in the past, something that we know has ended when we are talking about it: "Hier, le garçon est allé à la ...
RA
Answered by Rachel A. • French tutor
2793 Views

I don't understand differentiation. How does it work?

The first thing to know is that it is absolutely fine to be struggling with differentiation. It is one of the harder topics of A Level maths that you won't have seen before. I know it certainly took me a whi...
TD
Answered by Tutor296844 D. • Maths tutor
7991 Views

An unknown gas from a reaction is contained in a 2 litre beaker, at standard atmospheric pressure and a Temperature of 25 Celsius. Calculate the number of moles of the gas.

PV=nRT n=PV/RT=(1.01*10 5 0.002)/(8.31 298)=0.0816 moles
JM
Answered by James M. • Chemistry tutor
2210 Views

y(x) = x^2(1-x)e^-2x , find y'(x) in the form of g(x)e^-2x where g(x) is a cubic function to be found

For this question, I would first expand the brackets in the given y(x) to form , x^2e^-2x -x^3e^-2x . With this form, I would then differeniate using the chain rule to then obtain the expression that can eas...
AB
Answered by Arjun B. • Maths tutor
4078 Views

Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction (3 marks)

The question is three marks, so should have three points.1) Active site of the enzyme has a specific shape / tertiary structure / complementary to maltose 2) Only maltose can bind / fit3) Forms an enzyme-sub...
AW
Answered by Amy W. • Biology tutor
3279 Views