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Chemistry
A Level

How do you work out an electron configuration?

A full electron configuration shows the amount of electrons in each shell and subshell of an element or ion. Shells (also called energy levels) progress from 1 to 4, with 1 being the closest to the centre...

Answered by Lauren B. Chemistry tutor
1024 Views

0.28 g of a gaseous hydrocarbon was turned in excess oxygen. 0.88 g of carbon dioxide and 0.36 g of water were formed. The volume of 0.28 g of the hydrocarbon at 1.01 x10^5 Pa and 298 k is 123 cm^3. Work out the molecular formula of the hydrocarbon.

For a problem such as this, it is important to break down the question into the individual aspects and use some principles of chemistry that we have learnt previously to tackle the problem one step at a t...

Answered by Callum B. Chemistry tutor
1526 Views

State what is meant by term enthalpy change of neutralisation

Formation of 1 mole of water from neutralisation under standard conditions (OCR A)

Answered by Chemistry tutor
748 Views

How do buffer solutions work and how do you calculate the pH of a buffer solution?

First consider what a buffer is and what a buffer can be made from. A buffer is a solution resisting change in pH formed from a weak acid and its salt (a conjugate acid base pair), or from any weak acid a...

Answered by Chemistry tutor
1667 Views

Without calculation, predict (giving you reasoning) whether the entropy change for the following reaction will be significantly positive, significantly negative or approximately zero: MgO(s) + CO2 (g) --> MgCO3 (s)

Significantly negative. A gas is turning into a solid thus there is less of a tendency towards randomness.

Answered by Isobel M. Chemistry tutor
1067 Views

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