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Chemistry

GCSE

Explain the nuclear model

The atom consists of three sub-atomic particles: Protons; Neutrons and electrons. Protons and neutrons are in the nucleus of the atom and the electrons occupy the electron shells around the nucleus.

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Answered by Emily P. • Chemistry tutor

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Georgia has a bucket of sandy sea water, and wants to separate it out into it's components: sea-salt, water and sand. What steps should she take to achieve this? How can she check at the end that the water is pure?

First, she should filter the mixture using a filter funnel and filter paper to remove the sand. Then, she should distill the remaining solution, using a bunsen burner, a distillation column and a condensi...

Answered by Nikhil B. • Chemistry tutor

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Write a balanced equation for the reaction of calcium hydroxide with nitric acid.

Ca(OH)2 + 2HNO3 --> Ca(NO3)2 + 2H2O

Answered by Jonathan C. • Chemistry tutor

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Explain why graphite is able to conduct electrcity and diamond is not

Carbon in graphite has three bonds, where as the carbon atoms in diamond form four bonds to one another. As carbon has 4 electrons in its outer shell, this means graphite has one free electron which is ab...

Answered by Qasim J. • Chemistry tutor

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Give the reagents and conditions needed to convert a secondary alcohol into a ketone. Name the process which occurs during the conversion.

Reagents: Potassium dichromate and concentrated sulfuric acid (catalyst) Conditions: Heat under reflux The process which happens when a secondary alcohol is converted to a ketone is called oxidation.

Answered by Lucy S. • Chemistry tutor

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