Elakkeya J. A Level Biology tutor, GCSE Biology tutor, GCSE Chemistry...

Elakkeya J.

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Chemical Engineering (Masters) - Sheffield University

5.0
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1 review

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28 completed lessons

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20/03/2017

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5from 1 customer review
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Lara (Student)

October 21 2016

Qualifications

SubjectQualificationGrade
MathsA-level (A2)A
ChemistryA-level (A2)B
BiologyA-level (A2)A

General Availability

Pre 12pm12-5pmAfter 5pm
mondays
tuesdays
wednesdays
thursdays
fridays
saturdays
sundays

Subjects offered

SubjectQualificationPrices
BiologyA Level£22 /hr
ChemistryA Level£22 /hr
MathsA Level£22 /hr
BiologyGCSE£20 /hr
ChemistryGCSE£20 /hr
MathsGCSE£20 /hr
ScienceGCSE£20 /hr

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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3 years ago

1877 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 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. 

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. 

Show more

3 years ago

9668 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 process:

Cu2+ (aq) + 2e- --> Cu (s)

Reduction of copper ion produces copper atom. 

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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3 years ago

3263 views

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