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Why is graphite softer than diamond if they are made up from the same covalently bonded carbon atoms?

Diamond is an extremely strong and rigid substance because of its molecular structure, which is giant covalent structure. This means that every carbon is covalently bonded to 4 other carbon molecules to form...
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Answered by George W. • Chemistry tutor
27120 Views

What is an unsaturated hydrocarbon?

An unsaturated hydrocarbon is a molecule containing only hydrogen and carbon with a carbon carbon double bond in the molecule.
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Answered by Ella N. • Chemistry tutor
3334 Views

Describe the difference between reflection and refraction (assume the mediums have smooth surfaces)

Reflection: a wave hits a surface, and bounces back into the medium it was originaly in Refraction: a wave enters a medium with a different refractive index to the original medium it was travelling in, at an...
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Answered by Abigail B. • Physics tutor
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How do you form an aorist verb?

In Ancient Greek, the aorist is the equivalent to our simple past. There are two forms of aorists: the sigmatic first aorist and the thematic second aorist. The sigmatic first aorist is formed on the 3rd pri...
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How do you form subjunctives in French and when should you use them?

The simplest way to form any present subjunctive is to take the verb, conjugated in the present indicative and put it the third person plural. Let's take the verb 'finir' as an example. The third person plur...
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Answered by Caitlin W. • French tutor
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