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Chemistry
GCSE

Why do different metals burn with different colors?

This is because when the metals are heated (burned), their electrons can briefly 'jump' from lower energy electron shells to higher energy electron shells. This requires energy to happen, and light is not...

Answered by Frank L. Chemistry tutor
6537 Views

What mass of MgCl2 is formed in the following equation if 48g of Mg react in the following equation: Mg + 2HCI -> MgCI 2 + H

First you must calculate the moles of Mg that originally reacted. moles = mass/Mr moles=48/24 moles= 2 Molar ratio of Mg to MgCl2 is 1:1 Therefore 2 moles of MgCl2 were produced moles= mass/Mr mass= moles...

Answered by Sofia G. Chemistry tutor
3117 Views

What is the mass percentage of carbon in a CO2 molecule?

First we need to calculate the total mass of a CO2 molecule. This is done by summing up the individual masses of all the atoms. To find these, we look at the periodic table and see that the mas...

Answered by Ana D. Chemistry tutor
3448 Views

Ionic compounds have high melting points: Explain why and explain why Calcium Oxide has a higher melting point than Lithium Chloride

Ionic compounds are formed when electrostatic attractions form between oppositely charged ions. These attractions are strong and so require a large amount of energy to break. This energy is provided in th...

Answered by Sam M. Chemistry tutor
20229 Views

How might I go about balancing chemical equations?

First let us look at what the specification asks of you as a student:E.g. AQA GCSE chemistry specification 4.3.2.3 Using moles to balance equations (HT only) The balancing numbers ...

Answered by Claudia G. Chemistry tutor
2706 Views

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