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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...

Answered by Lauren T. Chemistry tutor
1522 Views

Why does the 1st ionisation energy of the atoms decrease down group 1? What does this tell us about their reactivity?

As you descend the group, the nuclear charge increases with the addition of further protons. Despite this, the atomic radius from the nucleus to the valence electron increases with more electron shells as...

Answered by Hamish M. Chemistry tutor
1263 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...

Answered by Zohaib A. Chemistry tutor
1620 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 ...

Answered by Euan M. Chemistry tutor
1521 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
3002 Views

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