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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
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When both sodium and Hydrochloric acid are added to a test tube, what will be observed?

When a Metal and acid react together they form a salt, and hydrogen gas. You can't really see the salt when is is formed, as salts dissolve in solution. However you can see the hydrogen gas bubbles. So fizzi...
Answered by • Chemistry tutor
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Using your knowledge of periodicity and atomic structure, why does the first ionisation energy decrease moving down a group yet increase moving along a period in the periodic table?

Moving down a group means that the shielding of the outer electrons is increased due to the greater number of inner electron shells within the atom - these are between the nucleus and the outer electrons. As...
AI
Answered by Alfie I. • Chemistry tutor
2136 Views

Explain the shapes of the molecules NH3 and AlCl3 (using diagrams)

Covalent molecules come in all shapes and sizes, depending on pairs of electrons in the outer shell, which repel each other due to their negative charge . Pairs not shared with another atom (‘lone’ pairs) wi...
HS
Answered by Holly S. • Chemistry tutor
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