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Define three element properties and explain how they change across the periodic table.

First, we have atomic and ionic radii which, as the name suggests, refer to the size of the atom, or the ion in the latter case. Radii increase as you go down a group (i.e. Halogens), since the number of orb...
DA
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How can I understand Aquinas' Natural Moral Law theory?

In order to respond to this question, I shall begin by eliciting the students' existing knowledge on the matter. I may ask, 'what can you tell me about Aquinas' theory?' Depending on the response, I will emp...
JH
Answered by James H. • Philosophy tutor
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A ball is projected vertically upwards from the ground with speed 21 ms^–1. The ball moves freely under gravity once projected. What is the greatest height reached by the ball?

Set out information given in question, and taking the upward direction to be positive: s (displacement) = ?, u (initial speed) = 21ms -1 , v (final speed at maximum height) = 0ms -1 , a (acceleration when fa...
SS
Answered by Shruti S. • Maths tutor
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Solve 7x + 6 > 1 + 2x

7x + 6 > 1 + 2xFirst, we collect the like terms so we move all the x's to one side and all the integers to the other:5x > -5Then we divide by 5 on each side to find what just x will be.Therefore, x &gt...
JZ
Answered by Juliet Z. • Maths tutor
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What is the photoelectric effect and how does it provide evidence for the quantisation of electromagnetic radiation?

(Many students have an intuitive understanding of the photoelectric effect and how it demonstrates quantisation, but it is important when preparing for an exam to be able to explain this clearly and precisel...
RP
Answered by Rohit P. • Physics tutor
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