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How many moles of Magnesium must react with excess Oxygen to produce 80g of Magnesium oxide?

This question looks at the reaction: Magnesium + Oxygen goes to Magnesium Oxide Mg + O --> MgO The first step is to calculate the moles of MgO produced using the mass in the question and the relative form...
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Answered by Thomas C. • Chemistry tutor
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State and explain the trend in atomic radius down a group of the periodic table

Down a group of the periodic table, the atomic radius increases. As we go down a group, the outermost electron of an atom is placed in a shell that is further from the nucleus. This means it experiences the ...
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Answered by Thomas C. • Chemistry tutor
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If a cricket ball of mass 500g is thrown upwards from the ground with an initial velocity of 20 m/s, how high will the ball reach?

The best method of answering this question would be to look at the energy of the ball at the moment it is thrown and at the moment it reaches its highest point. When the ball is thrown, initially all the ene...
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Answered by Thomas C. • Physics tutor
13797 Views

How do you find the roots of a cubic equation?

Solving cubics is an interesting problem: while there is a formula which can find the roots of every cubic equation, it isn't taught and is not generally worth learning. Instead, exam questions will often gi...
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Answered by Sam M. • Maths tutor
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How do I open my personal statement?

The first sentence should immediately set out something you have done and how it directly relates to your course. Why? Some people open with a quote, or a similar "attention grabbing" flourish. Giv...
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