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GCSE

Describe and explain the properties of graphene

Graphene has strong covalent bonds between the carbon molecules giving graphene properties such as a high melting point and making it very strong.Due to the delocalised electrons that are free to move acr...

Answered by Harry C. • Chemistry tutor

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What are the properties of ionic compounds?

Crystalline solids at rtphigh mp and bpoften soluble in waterconduct electricity when dissolved in water or molten

Answered by Elena M. • Chemistry tutor

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A) Write a balanced equation for the reaction of Calcium metal with water B) If I react 3 g of Calcium metal, what number of moles do I have?

Reactions and trends of group 1 and 2 metals are common questions asked at GCSE- Ca + 2 H₂O ==> Ca(OH)₂ + H₂This reaction will be exothermic and happen slowly in cold w...

Answered by Willow S. • Chemistry tutor

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20kg of ammonium nitrate is made from ammonia and nitric acid, what mass of ammonia was used?

The given equation is - NH₃+ HNO₃ --> NH₄NO₃
Equation to use - Moles = Mass/RFM
RFM of ammonium nitrate = 14 + 4 + 14 + (3x16) = 80
20kg = 2...

Answered by Jonathan S. • Chemistry tutor

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How should I approach answering moles calculation questions?

The key to answering any moles calculation question in chemistry is working out which equation you need to use. Generally, if moles are involved it will be moles = volume x concentration or moles = mass/R...

Answered by Jonathan S. • Chemistry tutor

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