Top answers

Chemistry
GCSE

How do I know the formula for salts formed in a reaction?

Example: NaCl. Every element in group 1, including sodium, has one electron in its outer shell and it wants to lose this one electron to have only full shells. Everything in group 7, including chlorine, h...

LT
Answered by Lauren T. Chemistry tutor
2048 Views

How can crude oil be separated into different fractions?

Crude oil is a mixture of different hydrocarbons, of varying length. As they have different boiling points they can be separated.Crude oil is heated/vaporised from oil to gas.These vapours enter the fract...

ZA
Answered by Zohaib A. Chemistry tutor
2167 Views

What happens to the reactivity of Group 1 elements going down the group and describe why that trend occurs?

The reactivity of Group 1 elements increases down the groupAs the atom becomes larger so the attraction between the positive nucleus and negative electron becomes weaker. Shielding also increases meaning ...

EM
Answered by Euan M. Chemistry tutor
2309 Views

Explain the difference between an unsaturated and saturated compound.

An Unsaturated compound has a double carbon to carbon bond I.e) C=C where as a saturated compound has a single carbon to carbon bond like this C-C.

Answered by Chemistry tutor
4062 Views

What is fractional distillation and how does it work.

Fractional distillation uses a fractional distillation tower, split into different layers each with a different temperature. It is used to sperate crude oil into the many different fuels used commonly in ...

Answered by Chemistry tutor
1931 Views

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