Elakkeya J. A Level Biology tutor, GCSE Biology tutor, GCSE Chemistry...
£20 - £22 /hr

Elakkeya J.

Degree: Chemical Engineering (Masters) - Sheffield University

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Subjects offered

SubjectLevelMy prices
Biology A Level £22 /hr
Chemistry A Level £22 /hr
Maths A Level £22 /hr
Biology GCSE £20 /hr
Chemistry GCSE £20 /hr
Maths GCSE £20 /hr
Science GCSE £20 /hr

Qualifications

QualificationLevelGrade
MathsA-LevelA
ChemistryA-LevelB
BiologyA-LevelA
Disclosure and Barring Service

CRB/DBS Standard

No

CRB/DBS Enhanced

No

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Ratings and reviews

5from 1 customer review

Lara (Student) October 21 2016

Questions Elakkeya has answered

Describe and explain the trend in reactivity of the alkali metals (Group 1)

Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer electron and the nucleus weakens. As a result the outer electron is lost more easily. 

Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer electron and the nucleus weakens. As a result the outer electron is lost more easily. 

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1 year ago

418 views

Describe how animals and plants are adapted to survive in dry conditions such as deserts.

Animals Have large surface area to increase loss of heat by radiation, which allows the animal to keep cool.  Have reduced body fat. Body fat acts as an insulating layer preventing loss of heat from the body.  Plants Have spikes instead of leaves. This allows for reduced surface area, which...

Animals

Have large surface area to increase loss of heat by radiation, which allows the animal to keep cool. 

Have reduced body fat. Body fat acts as an insulating layer preventing loss of heat from the body. 

Plants

Have spikes instead of leaves. This allows for reduced surface area, which in turn reduces water loss through transpiration. Transpiration is the process by which water is lost through leaves. During transpiration water molecules evapourate through holes in the underside of the leaf called stomata. 

Have extensive roots. Long and wide roots enable the plant to absorb more water.

Have few stomata. This reduces water loss through transpiration. 

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1 year ago

1870 views

Describe what happens to copper ions during electrolysis of copper sulphate.

Copper ions are positively charged. So they are attracted to the negative electrode. The negative electrode is called cathode. At the cathode, each copper ion gains two electrons. They are said to be reduced because reduction is the gain of electrons.  The ionic equation for the reduction pro...

Copper ions are positively charged. So they are attracted to the negative electrode. The negative electrode is called cathode.

At the cathode, each copper ion gains two electrons. They are said to be reduced because reduction is the gain of electrons. 

The ionic equation for the reduction process:

Cu2+ (aq) + 2e- --> Cu (s)

Reduction of copper ion produces copper atom. 

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1 year ago

1115 views
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