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Chemistry
GCSE

How is crude oil separated into fractions?

Crude oil is composed of many hydrocarbons. The crude oil is heated to evaporate it and the vapour rises. There is a temperature gradient up the column (hotter at the bottom...

Answered by Daisy D. Chemistry tutor
2692 Views

How do I balance symbol equations?

The most important thing to remember about chemistry equations, whether these are word or symbol equations, is that you must always have the same amount of each species (element or molecule) on both si...

Answered by Kiani J. Chemistry tutor
3079 Views

What does OILRIG stand for and what is the significance?

Oxidation Is Loss Reduction Is Gain = OILRIG

This is a helpful acronym to describe the term given to a loss or gain of electrons. If atom looses or gains an elect...

Answered by Alice C. Chemistry tutor
72925 Views

Why is the Haber Process run at 450 °C instead of room temperature?

the forward reaction of the harbour process is exothermic, it gives out heat. so increasing temperature  will shift the equilibrium and decrease the yeild, however inc...

Answered by Tom F. Chemistry tutor
9722 Views

What is empirical formula and how is it worked out?

Empirical formula is  the simplest ratio of elements in a formula. chemists use it to make big molecules easier to work with when doing calculations.

An example of a working out an empiri...

Answered by Tom F. Chemistry tutor
2363 Views

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