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Chemistry
GCSE

How is crude oil separated into fractions?

Crude oil is seperated using a method called fractional distillation. The hydrocarbons that make up crude oil have different boiling points, so when the crude oil is heated, each compound evaporates at...

Answered by Devna P. Chemistry tutor
11093 Views

What does Avogadro's number mean?

Avogadro's number is simply used as a way of telling us how much of a substance we have. 

The number is 6.022 x 1023, and if we have that number of particles, we can make it ea...

Answered by Kristina F. Chemistry tutor
24550 Views

Why is a H+ ion referred to as a proton?

An atom of hydrogen contains 1 proton, 1 electron and 0 neutrons. When hydrogen loses an electron to become H+ only a proton remains. 

We can work out the number of neutrons an atom has by...

Answered by Oliver H. Chemistry tutor
23166 Views

What happens when you heat Calcium Carbonate?

First can you tell me what kind of reaction is this reaction?

Thermal decomposition 

Secondly can you tell me the products of this reaction and have ...

Answered by Kyle P. Chemistry tutor
5946 Views

How do you increase the rate of a reaction?

A reaction will occur if two reactants collide with each other with enough energy to overcome the 'activation energy'. The activation energy is the minimum amount of energy the reactant particles need ...

Answered by Ruby R. Chemistry tutor
3502 Views

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