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What is a covalent bond?

A covalent bond in an intramolecular bond which occurs when a pair of electrons is shared between two elements, usually two non-metals. The electrons shared are in the outer shell of the atom of each element...
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Answered by Rebecca P. • Chemistry tutor
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How would a reduced level of chlorphyll in a plant cause a stunted growth? Can anything else affect growth?

Chlorophyll is vital for photosynthesis, which is how the plant makes glucose for energy. If there is less photosynthesis, there will be less glucose made and so less energy released for growth. Glucose is n...
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Answered by Rebecca P. • Biology tutor
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What is the Biuret test? How do I interpret the results?

The Biuret test is a test for protein, which detects for the presence of protein bonds. In the test, Biuret reagent (sodium hydroxide, hydrated copper (II) suphate and sodium tartrate) is added to the liquid...
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Answered by Rebecca P. • Biology tutor
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What should I include in my personal statement?

A personal statement needs to be unique and memorable but also show your passion for the subject. For medicine, you need to show you're a caring person and give specific examples of this, which is why work e...
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What is the gradient of the curve 3x^3 + 7x at the point x=3?

The gradient or the slope of a curve is defined as the change in the y direction over the change in the x direction (dy/dx). In order to calculate a formula for the gradient of a curve we must differentiate ...
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Answered by Junaid K. • Maths tutor
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