Top answers

Why does the reactivity of the Group 1 elements increase as you go down the group?

As you descend group 1, there is an increasing number of electron shells, therefore increasing the distance between the positive nucleus and the negative outer electron which decreases the attraction between...
BJ
Answered by Bethan J. • Chemistry tutor
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Explain the formation of the ionic compound Calcium Chloride

This is an example of ionic bonding, meaning that the cation (calcium) will lose electrons and the anion (chloride) will gain electrons so all ions will have a full outer shell.Calcium will form a 2+ ion, me...
BJ
Answered by Bethan J. • Chemistry tutor
23632 Views

Explain why graphite conducts electricity. The answer should include structure and bonding of graphite.

Each carbon atom in graphite forms 3 covalent bonds, which means there is one delocalised electron per carbon atom. These delocalised electrons can move through graphite and carry charge.
MS
Answered by Maria S. • Chemistry tutor
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The halogens are elements in Group 7. Bromide is in Group 7. How many electrons are there in the outer shell of a bromine atom? (1 mark)

7 electrons.
MS
Answered by Maria S. • Chemistry tutor
5662 Views

Using collision theory, explain why increasing the concentration of a reactant increases the rate of reaction.

Chemical reactions occur when reacting particles collide with energy equal to or greater than the activation energy . By increasing the concentration of reactants, there are more reacting particles present, ...
AH
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