Top answers

Chemistry
GCSE

Give two reasons why cryolite is used in the electrolysis of aluminium oxide.

The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus...

JE
Answered by Javier E. Chemistry tutor
84618 Views

How can we calculate product yield using reactants and reaction stoichiometry?

If we know the chemistry for a reaction we only need to know quantities from one of our reactants to calculate a product yield. For instance, in a reaction to make hydrogen peroxide, we can calculate the ...

JP
Answered by Joshua P. Chemistry tutor
2595 Views

Why don't Hydrocarbons and Water Molecules mix, and why might an emulsifier fix this?

Hydrocarbons are long chained, non-polar molecules of Carbon and Hydrogen. As the chain length increases the boiling point of oil increases and the intermolecular forces get stronger. At smaller chain len...

JP
Answered by Joshua P. Chemistry tutor
6562 Views

Describe the difference between bonding in ionic structures and covalent molecules

Ionic structures form giant lattices with many electrostatic attractions between oppositely charged ions. Covalent molecules have strong covalent bonds involving a shared pair of electrons.

CD
Answered by Cam D. Chemistry tutor
2181 Views

Describe the effect in terms of particles and collisions the effect of increasing temperature on rate of reaction?

The rate of reaction will increase. Increased temperature causes the particles to move faster, increasing the number of collisions between the particles. More particles have energy exceeding the activatio...

LR
Answered by Luke R. Chemistry tutor
2864 Views

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