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Define the term Covalent Bond

A covalent bond is formed by a shared pair of electrons between two atoms.
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Answered by Rex O. • Chemistry tutor
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Write a description of your town focusing on character, size and population

J'habite à Bath en ce moment, c'est une ville au sud-ouest de d'Angleterre avec plein d'ambiance et de charactère. Meme si elle n'est pas très grande, cette ville possède un environment chaleureux et excitan...
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Answered by Mark M. • French tutor
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Differentiate the equation y = (1+x^2)^3 with respect to (w.r.t.) x using the chain rule. (Find dy/dx)

For this example it would be better to use a dummy variable (a variable just to help with solving the equation but isn't a part of the final answer). Let us say our dummy variable, t = 1+x^2. So, substitutin...
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Answered by Paolo A. • Maths tutor
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How does the right angle triangle definition of sine, cosine and tangent relate to their graphs as a function of angle and to Euler's formula?

To answer this question we must understand the representation of the unit circle firstly in real coordinates and secondly in the complex plane. The unit circle is just the drawing of a circle of radius 1 in ...
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Answered by Caroline D. • Maths tutor
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Describe and explain two ways in which alveoli in the mammalian lung are adapted for efficient gaseous exchange

Alveoli in the mammalian lung are thin walled to allow the quick passage of gases, for example oxygen and carbon dioxide. Alveoli in the mammalian lung have a large surface area which allows for the diffusio...
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Answered by Guy A. • Biology tutor
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