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Chemistry
GCSE

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 nee...

Answered by Morgan H. Chemistry tutor
7872 Views

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!...

Answered by Angus B. Chemistry tutor
12008 Views

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...

Answered by Rachel J. Chemistry tutor
14282 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 

Answered by Zehra M. Chemistry tutor
1644 Views

How do I balance the chemical equation: C2H4 + O2 --> CO2 +H2O

First take a look at the equation and see how many elements there are, in this case we have 3 different elements; Carbon, Hydrogen and Oxygen. To balance the equation start off by balancing the elements i...

Answered by Andrei P. Chemistry tutor
50073 Views

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