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Chemistry

GCSE

What is Cracking and why is it carried out?

Cracking is the process of breaking large Hydrocarbon molecules into smaller ones.
This is carried out to refine fuels and increase the yeild in petrolium refining.

Answered by Anna G. • Chemistry tutor

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If an element has an atomic mass of 19 and a proton number of 9, how many neutrons does it have and how many electrons does it have?

The atomic mass is made up of all the protons and neutrons (which together form the nucleus) which each have a mass of approx. 1g. Therefore if the mass of the element is 19g and it has 9 protons (proton ...

Answered by Jay T. • Chemistry tutor

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Calcium carbonate is burnt substance B is created. What is the formula for substance B and what is the equation when water is added?

Cao

Cao + H20 --> Ca(OH)2

Answered by Thomas N. • Chemistry tutor

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What are the components of an atom and what are their properties?

An atoms is composed of a central NUCLEUS, with ELECTRONS occupying shells, moving around the nucleus.

The nucleus is composed of PROTONS and NEUTRONS.

The PROTON...

Answered by Axel R. • Chemistry tutor

5712 Views

How would you correctly carry out a flame test, and what colour would potassium yield, and what colour would lithium yield?

Answer First a wire loop is cleaned with diluted hydrochloric acid, which is then dipped into the sample metal or solution. This is then held over an open flame and the colour emitted is ...

Answered by Charlotte K. • Chemistry tutor

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