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Please can someone EXPLAIN this?

Can someone please explain this?The ans to this is D

Can someone please explain this?The answer to this is A

current=charge/time.The charge is 4Q.Frequency is 1/T.therefore I=Qxf.Charge is 4Q frequency f so 1/T =f.If u put this in the formula you'll get I=4Qf which is option A and this is the answer.

Yes thats true the other thread is quite confusing and most of the time several questions aren't even answered.Can anyone help with this question?The ans to this is A.

:%) :cry: :%) :cry:

Exactly.So shouldn't universities consider this?It seems unfair if they don't :(.Btw is IGCSE o levels more difficult or gce o levels?

Yes its B.How did u get it?could you explain it?

@angelgurl .No HCl is not supposed to produce ammonia.Ammonium compunds ALWAYS react with alkalis to form salt,water and AMMONIA gas.So the answer would be C since limewater would react with ammonium sulphate to liberate ammonia.

Q9 w10_11 In a calorimetric experiment 1.60 g of a fuel is burnt. 45 % of the energy released is absorbed by 200 g of water whose temperature rises from 18 ° C to 66 °C. The specific heat capacity of water is 4.2 J g–1K–1 . What is the total energy released per gram of fuel burnt? A 25 200...

39 Use of the Data Booklet is relevant for this question. In an organic synthesis, a 62 % yield of product is achieved. Which of these conversions are consistent with this information? 1 74.00g of butan-2-ol → 44.64 g of butanone 2 74.00g of butan-1-ol → 54.56 g of butanoic acid 3 74.00g...