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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

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Explain the processes that lead to the contraction of a single muscle

A nervous impulse travels to the neuromuscular junction and causes the release of acetylcholine into the synaptic cleft. Depolarisation of the motor end plate spreads through the muscle via transverse tub...

Answered by Prashan B. • Biology tutor

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1. (a) Express 7cosx - 24sin x in the form R cos (x + a), (b) hence what is the minimum value of this equation

(a) Rcos (x+a) = Rcosxcosa - Rsinxsina

7cosx - 24sinx = Rcosxcosa - Rsinxsina

Rcosa = 7, Rsina = 24

Tan a = 24/7

a = 1.287 (3 S.F.)

R²

Answered by Prashan B. • Maths tutor

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Analyse Gatsby’s attitude to Daisy in aiming to achieve his own version of the American Dream. Refer to the extract as a starting point.

Example paragraph:

The extract initially describes Baldwin’s departure from a building, and the particular language choices aid us in relating the text to Gatsby’s intense business lifestyle and ho...

Answered by Charlotte F. • English tutor

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Literature often reflects destruction with little room for redemption. Compare and contrast two of the texts you have studied in light of this comment.

Ian McEwan and Tennessee Williams weave the theme destruction into the novels ‘Atonement’ and ‘A Streetcar Named Desire’ by portraying the influence of class and wealth and the injustice it causes. The id...

Answered by Prashan B. • English Literature tutor

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