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Draw an example using a diagram of Carbon, three "Y" substrates and an "L" indicating any leaving group the Sn1 nucleophilic substitution reaction. (3 marks) Which step is fastest (1 mark).

Y 3 CL -> [Y 3 C] + + L - (1 mark)Ligand leaves in first step. Can still show ligand as product anion but no need. Also accept any halide as leaving group. Step 2 a little harder as not signposted in ques...
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Answered by James P. • Chemistry tutor
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Draw a diagram showing a normal iris and what happens to the iris when a light in shined into the human eye. (1 mark). What causes this to happen? (2 marks)

(Any diagram showing an iris that has constricted) 1 mark In high light levels (1 mark) Accept reflex action due to increased photoreceptor action or words to that effect circular muscles relax and radial mu...
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Answered by James P. • Biology tutor
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For all values of x f(x) = x^2 + 2 g(x)= x - 5 show that fg(x) = x^2 -10x +27

Firstly, we have to substitute g(x) into the function f(x)So, fg(x) = (g(x))^2 +2 Next we must rewrite the equation on the RHS in terms of x only So, fg(x) = (x-5)^2 +2 Next we must simplify the RHS by expan...
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Answered by Yasmin S. • Maths tutor
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What velocity should your boat have if you want to cross a 72m wide river in 6s by the shortest distance, with a 5 m/s downstream current?

Key physics concepts: Velocity vectors, Distance/speed/time relations Key mathematical concepts: Trigonometry, Pythagorean triples, Vector addition/subtraction.Recall that velocity is a vector quantity, and ...
Answered by • Physics tutor
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What are the different types of price discrimination that can be employed?

First-degree price discrimination, alternatively known as perfect price discrimination, occurs when a firm charges a different price for every unit consumed. The firm is able to charge the maximum possible p...
Answered by • Economics tutor
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