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Identify and explain the trend in atomic radius across a period

The atomic radius across a period in the periodic table tends to decrease from left to right. As you move across a period the number of electrons from one element to the next increases by one. The electron i...
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Answered by Olavo M. • Chemistry tutor
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Differentiate x^3 + y^4 = 34 using implicit differentiation

An implicity function is one that is not expressed in the form y = f(x) such as the equation in the question. Instead of rearranging the equation to make y the subject, the equation can be differentiated usi...
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Answered by Olavo M. • Maths tutor
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Describe the key difference between a scalar and a vector quantity

A scalar quantity is one that only has magnitude while a vector has magnitude and an associated direction. For example, temperature is a scalar quantity because temperature only has magnitude/ size, there is...
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Answered by Olavo M. • Physics tutor
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At what points does the line y = x +1 intersect the circle x^2 + y^2 + 18x + 20y + 81 = 0.

The method we shall use is substitution. We shall replace y each term by 'x + 1' so we are able to obtain an equation in one variable. x^2 + (x+1)^2 + 18x + 20(x+1) + 81 = 0. We now expand the brackets. x^2 ...
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Answered by Harry R. • Maths tutor
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What is the Le Chatelier's principle?

The Le Chatelier principle was estates that if there is a change in the conditions in a dynamic equilibrium system, the equilibrium of the system will move in order to counteract the change. The conditions t...
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