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Chemistry
GCSE

Describe one chemical test and one physical test for pure water.

A physical test for pure water is testing the boiling or freezing point. Pure water will boil at 100 degrees Celsius and freeze at 0 degrees Celsius. One chemical test is to use cobalt chloride paper - th...

Answered by Sumrah N. Chemistry tutor
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Describe one similarity and one difference between the structures of diamond and graphite.

Answer:Similarity: either: both contain carbon atoms; or: both have strong covalent bonds between the atomsDifference: either: graphite structure has layers whereas diamond structure...

Answered by Tutor65308 D. Chemistry tutor
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What is meant by equilibrium

When a reaction is in equilibrium, it means the rate of the forward reaction is equal to the rate of the backwards reaction. The concentrations of the reactants and products remain constant, but this does...

Answered by Celine Iswarya P. Chemistry tutor
3545 Views

Reaction between a metal and acid gives?

Metal + Acid --> Metal salt + H2 (g)E.g. Cu + HCl --> CuCl2 + H2

Answered by Celine Iswarya P. Chemistry tutor
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The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

Answer= 0.144gWorking out:mol= conc x volume (in dm^3)mass = mol x RFFSo,mol = 0.18 x (20/1000) = 0.0036molMass= 0.036 x 40 = 0.144g

Answered by Celine Iswarya P. Chemistry tutor
12346 Views

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