Bonding & Structure (2) Flashcards
Predict the boiling point of bromine
30
Why is hydrogen, and not magnesium, produced at the cathode?
Hydrogen is less reactive than magnesium
Suggest two changes that the student must makes to his apparatus to be able to silver plate the metal spoon. Give a reason for each change
Solution must be silver nitrate otherwise copper will be deposited and so spoon must be the cathode as silver ions have a positive charge
Why is it difficult to electroplate plastic spoons?
As plastic is an insulator
Why is iron described as an element?
As iron is made up of only one type of atom
The three metals in stainless steel have different sized atoms. Stainless steel is harder than pure iron.
Explain why
Structure is different so it is difficult for layers to slide over each other
The bonds between atoms in graphene are …
covalent
Graphite is used in pencils.
Explain why?
As the layers can slide due to there being no bonds between layers
Use the equation to help you to describe what you would observe when magnesium reacts with the acid
Hydrogen gas is produced and magnesium disappears
How could you obtain solid magnesium sulfate from this solution?
By crystallisation
