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Chemistry
A Level

How would you work out the mols of a substance?

Mols is a measure of the amount of a molecule present, chemically defined as 1/12th of an atom of carbon 12

Mols = Mass (g) / Molecular Mass (gmol^-1)

Answered by Bilal U. Chemistry tutor
2088 Views

Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3

Phosphorous has five electrons in its outermost shell of electrons. Fluorine provides three electrons to the phosphorous allowing the formation of a stable central phosphorous atom which now has 8 electro...

Answered by Prashan B. Chemistry tutor
8794 Views

Explain why the first ionisation energy of Strontium is less than the first ionisation energy of Calcium

Both of these elements are part of the 2nd group of elements on the periodic table. ie in first ionisation, their electron configuration changes from nS2 -> nS1.

Strontium is a much larger eleme...

Answered by Olivia H. Chemistry tutor
8317 Views

What is a nucleophile and what is an electrophile?

A nucleophile is a chemical species that can donate a pair of electrons to a different chemical species (generally to an electrophile) to form a chemical bond in a reaction. They are generally negatively ...

Answered by Francesca S. Chemistry tutor
37716 Views

Describe the structure of benzene, and how this affects its stability.

Benzene has the molecular formula C6H6, with the 6 carbon atoms forming a planar hexagonal ring of C-C sigma bonds. The six hydrogen atoms, one attached to each carbon atom via a C-H...

Answered by George T. Chemistry tutor
6536 Views

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