Henry S. A Level Chemistry tutor, A Level Biology tutor, A Level Math...

Henry S.

Currently unavailable: for new students

Studying: Chemistry (Masters) - Durham University

5.0
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3 reviews| 25 completed tutorials

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About me

About Me:

Having achieved top A-level grades I’m in a position to help you realise your potential in subjects that many find challenging. My passion for science will show through and helps me to teach in a way that's engaging and useul to you.

 

Sessions:

Success in A-level exams relies on understanding rather than rote learning. With this in mind, my task is to help you understand the material. One on one tutoring allows you to direct the session so I can directly help you in any way you need. 

 

Education: 

Colyton Grammar School (2007-2014)

Durham University (2014-present)

 

Qualifications:

A* grades in A-level chemistry, biology and maths as well as an A in A-level history. Also AS levels in further maths and critical thinking.

About Me:

Having achieved top A-level grades I’m in a position to help you realise your potential in subjects that many find challenging. My passion for science will show through and helps me to teach in a way that's engaging and useul to you.

 

Sessions:

Success in A-level exams relies on understanding rather than rote learning. With this in mind, my task is to help you understand the material. One on one tutoring allows you to direct the session so I can directly help you in any way you need. 

 

Education: 

Colyton Grammar School (2007-2014)

Durham University (2014-present)

 

Qualifications:

A* grades in A-level chemistry, biology and maths as well as an A in A-level history. Also AS levels in further maths and critical thinking.

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Ratings & Reviews

5from 3 customer reviews
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David (Parent)

May 29 2015

Sam has really benefitted from his sessions over the last few months. His confidence has improved along with his exam technique which we are sure will be reflected in his results in August. Thank you for all your help.

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David (Parent)

March 13 2015

Helped prepare for an upcoming exam, covering areas that my son found difficult and improving his confidence. Highly recommended.

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David (Parent)

February 6 2015

My son found the session very helpful in understanding topics he is struggling with at college.

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Qualifications

SubjectQualificationGrade
ChemistryA-level (A2)A*
BiologyA-level (A2)A*
MathematicsA-level (A2)A*
HistoryA-level (A2)A
General StudiesA-level (A2)B
Further Mathematics (AS)A-level (A2)B
Critical Thinking (AS)A-level (A2)A
Extended ProjectA-level (A2)A

General Availability

Before 12pm12pm - 5pmAfter 5pm
mondays
tuesdays
wednesdays
thursdays
fridays
saturdays
sundays

Subjects offered

SubjectQualificationPrices
BiologyA Level£22 /hr
ChemistryA Level£22 /hr
Extended Project QualificationA Level£22 /hr
MathsA Level£22 /hr
BiologyGCSE£20 /hr
ChemistryGCSE£20 /hr
MathsGCSE£20 /hr
ScienceGCSE£20 /hr
-Personal Statements-Mentoring£22 /hr

Questions Henry has answered

What are the stereochemical implications of bimolecular and unimolecular nucleophilic substitution?

If a chiral molecules undergoes nucleophilic substitution what happens to its stereochemistry?

SN1: These reactions occur with the production of a cationic intermediate. These contain an sphybrdised carbon atom with vacant p orbitals (hence the positive charge). The nucleophile can attack from above or below the plane of the molecule therefore producing a racemic mixture of product. If a single enantiomer is reacted with a nucleophile and the reaction proceeds via unimolecular nucleophilic substitution then equal amounts of both possible enantiomer will be formed (providing the carbon atom remains a chiral centre).

SN2: These reactions proceed via a transition state (anionic if the nucleophile is anionic) where the nucleophile attacks from one side and the leaving group leaves from the other. This results in something that resembles an umbrella turning inside out as the three unaffected groups switch sides. This means that if one enantiomer is reacted with a nucleophile then only a single enantiomer will be present in the products, although it's absolute configuration may have changed.

If a chiral molecules undergoes nucleophilic substitution what happens to its stereochemistry?

SN1: These reactions occur with the production of a cationic intermediate. These contain an sphybrdised carbon atom with vacant p orbitals (hence the positive charge). The nucleophile can attack from above or below the plane of the molecule therefore producing a racemic mixture of product. If a single enantiomer is reacted with a nucleophile and the reaction proceeds via unimolecular nucleophilic substitution then equal amounts of both possible enantiomer will be formed (providing the carbon atom remains a chiral centre).

SN2: These reactions proceed via a transition state (anionic if the nucleophile is anionic) where the nucleophile attacks from one side and the leaving group leaves from the other. This results in something that resembles an umbrella turning inside out as the three unaffected groups switch sides. This means that if one enantiomer is reacted with a nucleophile then only a single enantiomer will be present in the products, although it's absolute configuration may have changed.

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3 years ago

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