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Chemistry
GCSE

25 cm3 of NaOH was titrated with 0.050 mol dm-3 HCl. NaOH + HCl --> NaCl + H2O. 21.5 cm3 HCl neutralised 25 cm3 NaOH. Concentration of NaOH in mol dm-3?

21.5 cm3 / 1000 = 0.0215 dm3 of HCl. n = cv so (0.050) x (0.0215) = 0.001075 mols of HCl. NaOH + HCl --> NaCl + H2O so there is a 1:1 ratio of reactants to products. Th...

Answered by Arran S. Chemistry tutor
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Why do we use cracking?

To split large chain hydrocarbons into smaller more useful and more valuable hydrocarbons

Answered by Haider A. Chemistry tutor
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Describe the three main types of bonding?

  1. Ionic bonding - occurs between a metal an a none metal. Electrons are transferred between two atoms to form ions - atoms with either a positive or negative charge. Ionic bonding occurs because of th...
Answered by Katherine M. Chemistry tutor
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How does increasing chain length alter the melting and boiling temperatures?

For a substance to melt or boil, heat energy must be supplied. This is to overcome Van der Waals forces. As the length of a chain increases, there are more Van der Waals forces present due to the chain ge...

Answered by Rhea S. Chemistry tutor
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What is ionic bonding?

Ionic bonding occurs between positive and negatively charged ions. A simple example is Sodium Chloride. Sodium has 1 outer shell electron which it wants to lose in order to create a stable electronic conf...

Answered by Elizabeth N. Chemistry tutor
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