Top answers

How do you answer a long answer question on how buffer systems work?

1) First, state how the buffer is prepared by saying that an excess of acid reacts with a base (include the equation for this reaction) b) Write the overall equation of the buffer system (remember to show it...
RS
Answered by Ritvij S. • Chemistry tutor
3537 Views

What is empirical formula and how is it worked out?

This is the lowest/simplest ratio of the molecule. For example propene has the formula C 3 H 6 - if we look a the subscript numbers (the ones down here!) we can see that smaller numbers are possible. It is i...
EW
Answered by Emma W. • Chemistry tutor
19233 Views

Why is a diamond harder than graphite if they're made of the same substance?

Both diamond and graphite are made of carbon. Carbon can form a maximum of 4 covalent bonds due to carbon having 4 electrons on it's outer shell. In diamond, each carbon atom forms 4 covalent bonds in a tetr...
CC
60917 Views

Predict the effect of an increase in pressure and temperature on the production of ammonia in the reaction: N2(g) + 3H2(g) <-> 2NH3 (g) , where the change in enthalpy is -92.4 kJ

An increase in temperature and an increase in pressure will have contradictory effects on the reaction. The effect of an increase in the temperature of a system, on the equilibrium of a reaction, is dependen...
AS
Answered by Aaron S. • Chemistry tutor
42275 Views

How can I improve my exam technique?

The best way to improve your exam technique is to do past papers under timed conditions. Be strict with yourself and treat it like an actual exam. Then mark your own paper using the official mark scheme and ...
SL
Answered by Samah L. • Chemistry tutor
5658 Views