Top answers

How does fractional distillation work?

Fractional distillation works by using the fact that molecules of different sizes have different boiling points. Generally, the smaller a molecule, the lower its boiling point. When heating up a mixture of m...
DS
Answered by David S. • Chemistry tutor
33872 Views

Could you explain how an increased temperature increases the rate of reaction?

A chemical reaction will only occur if the molecules collide with enough energy, when you apply heat to a reaction you're giving the molecules more energy so when they collide they're more likely to react. A...
DB
Answered by Dominic B. • Chemistry tutor
2731 Views

25 cm^3 of a solution of known 0.2M HCl is neutralised by titration by 21.5cm^3 of NaOH solution. Calculate then concentration of the NaOH solution to 3dp.

Recall n = c *(v/1000) if the volume is in Cm 3 . Now, n(HCl)= 0.2 x (25.0/1000) n(HCl) = 5x10 -3 Since the relationship stoichiometrically is 1:1 (H + : OH - ), we can infer that n(NaOH) = 5x10 -3 and by re...
WF
Answered by Will F. • Chemistry tutor
3703 Views

Describe the Le Chantelier principle

If a factor affecting the position of an equlibirum is altered, the position fo equlibrium shifts to oppose the effect of the change.
SS
Answered by Sudip S. • Chemistry tutor
3465 Views

What is crude oil and how does fractional distillation work?

Crude oil is formed from detritus (dead living matter) of animal, plants and microscopic organisms under intense pressure and temperature. It is trapped under impervious rocks which stop the liquid and gas f...
AH
Answered by Amelia H. • Chemistry tutor
6209 Views