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Draw a diagram that represents the electronic arrangement of a fluorine atom.

Electrons are arranged in different shells (sometimes described as an energy levels) around the nucleus with the innermost shell being filled first and then working outwards. The first shell can hold a maxim...
IA
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How does bonding effect the melting point of a substance?

In chemistry we often talk about how 'weak' or 'strong' bonds are. The stronger the bonds are between two atoms, the more (kinetic) energy is required to break them apart. This means that more heat is needed...
MH
Answered by Morgan H. • Chemistry tutor
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Given the balanced equation: MgCO3 + 2HCl --> MgCl2 + H2O + CO2, if 5 grams of MgCO3 is used, what volume of CO2 is produced? (molar mass of MgCO3 is 84.3 g/mol)

This question can be split up into two parts, and uses two key equations: It's always a good idea to look at what information we have been given already, and work out what we can do with it! In this question...
AB
Answered by Angus B. • Chemistry tutor
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Describe how and explain why vegetable oils are hardened for use in foods.

Vegetable oils are reacted with hydrogen at 60 degrees Celcius in the presence of a nickel catalyst. This process is called hydrogenation. Vegetable oils contain carbon to carbon double bonds meaning they ar...
RJ
Answered by Rachel J. • Chemistry tutor
18239 Views

How does hot water in lakes make fish die

Increase in temperature causes a decrease in soulubility of gases so loss of oxygen and therefore fish die due to a loss of oxygen
ZM
Answered by Zehra M. • Chemistry tutor
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