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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

9184 Views

Expand (x-5)(2x-3)

(x-5)(2x-3)= 2x²-3x-10x+15

= 2x² -13x + 15

Answered by Sharone S. • Maths tutor

4514 Views

You are told that the y is proportional to x^2 and that when y=75, x=5. Find a formula for x in terms of y.

If we know that y is proportional to x²then we using the given values we can write 75= 5²--> 75=25, however this is obviously not true but all that remains is to multiply the 5<...

Answered by Jenieka P. • Maths tutor

2740 Views

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

2279 Views