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Explain, in terms of its structure and bonding, why magnesium oxide has a very high melting point (4).

Magnesium oxide has a giant 3D lattice structure formed by strong electrostatic forces of attraction between the positively charged magnesium ions and the negatively charged oxygen ions. These ionic bonds re...
LH
Answered by Luke H. • Chemistry tutor
28949 Views

Explain, in terms of its structure, why graphite is able to be used as a lubricant

In graphite, the cations are arranged in layers (sheets of carbon atoms)The layers are able to slide over each other without interrupting the bonding within the layersHence, graphite can act as a lubricant
CJ
Answered by Charles J. • Chemistry tutor
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Explain the factors that increase the rate of a reaction.

For molecules to react with each other, they need to react frequently with the correct speed, enough energy and in the correct direction. An increase in temperature increases the kinetic energy of molecules ...
FC
Answered by Fiona C. • Chemistry tutor
2862 Views

Describe how a metal conducts electricity

In order for something to conduct electricity, there must be charged particles within the substance and these charged particles must be free to move.Metals consist of positive ions in a sea of delocalised el...
AC
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Why does the reactivity of group 7 elements decrease down the periodic table?

As you go down the group, the outer electrons are further from the nucleus, this leads to a reduced attraction between the negative outer electrons and positive nucleus. Also, as there are more electrons, th...
DC
Answered by Dhiren C. • Chemistry tutor
15184 Views