Top answers

When do you use the compound past or the imperfect tense in French?

The compound past is used for actions that are completed and have no further relevance at present. For example, " J’ai fini mes devoirs." On the other hand, the imperfect tense is used for ongoing ...
LB
Answered by Louise B. • French tutor
2341 Views

Calculate the mass of sodium amide needed to obtain 550 g of sodium azide, assuming there is a 95.0% yield of sodium azide. Give your answer to 3 significant figures.

2NaNH2 + N2O --> NaN3 + NaOH + NH3 Mr(NaN3) = 65 Mr(NaNH2) = 39 n(NaN3) = 550/65 = 8.46 100% NaN3 = 550/65 x 100/95 = 8.91 n(NaNH2) = 2 x 8.91 = 17.8 m(NaNH2) = 17.8 x Mr = 17.8 x 39 = 694.7 = 695 g
KM
15379 Views

'Desdemona is a a powerless victim in Othello' to what extent do you agree?

INTRODUCTION: In Othello, ,Shakespeare keeps within the time and social constraints surronding women when creating the tragic victim, Desdemona. I agree with the statement as although one may argue that Desd...
YB
22721 Views

Give the importance of the lock and key model of an enzyme

The lock and key model only allows one type of specific substrate to form a substrate-activesite complex with each specific type of enzyme. This is due to their complementary shapes, as only one shape and he...
PF
Answered by Paula F. • Biology tutor
10687 Views

When you integrate, why do you need to add a +C on the end?

Integration can be used to undo differentiation. So if you had an equation that was y=5x+2 and differentiated to get dy/dx=5. When you integrate it you would only get y=5x, so the +2 is lost, to make sure yo...
KM
Answered by Katie M. • Maths tutor
4346 Views