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Chemistry
GCSE

Calculate the concentration in mol/dm3 of 8.0 g of sodium hydroxide (NaOH) in solution with a volume of 50 cm3. (Note Ar(Na) = 23, Ar(O) = 16, Ar(H) = 1)

Calculate Mr(NaOH): Mr(NaOH) = 23 + 16 + 1 = 40, Calculate NaOH moles: n= m/Mr, n= 8.0/40, n= 0.2 moles, Calculate NaOH concentration:(converting from cm3 to dm3 by /1000) c= n/v, c=...

IC
Answered by Imogen C. Chemistry tutor
8713 Views

Why does Sodium Chloride have a high melting point?

Sodium Chloride has a high melting point, as it has a giant ionic lattice hence has strong electrostatic forces of attraction between oppositely charged ions, which requires lots of energy to overcome the...

VS
37267 Views

How do I balance equations?

Balancing equations will become natural if you do it long enough but takes a bit of practice and can be tedious! It can be a bit of trial and error at times. It is important to remember that numbers of el...

AM
Answered by Aysha M. Chemistry tutor
2163 Views

Compare and contrast the structure and bonding of diamond and graphite.

1 mark each for each of these points:similarities:only contain carbon atomsatoms covalently bonded to each otherlattice structuredifferences:diamond has four covalent bonds and graphite has threediamond h...

AC
Answered by Annabel C. Chemistry tutor
4141 Views

During a chemical reaction, a student uses a catalyst. What is meant by the term "catalyst"?

A catalyst is something that increases the rate of a reaction without being used up itself. At the end of the reaction, the catalyst remains unchanged.

GR
Answered by Georgie R. Chemistry tutor
1882 Views

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