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State the effect that increasing the temperature has on the rate of the reaction. Explain this effect in terms of particles and collisions.

This question is about understanding how reactions happen, what it means for something to react and the factors controlling reactions. Here it is important to know that for a reaction to happen particles mus...
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Answered by Jack N. • Chemistry tutor
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Solve 2x + 7 = 13

In this question we are as to solve this equation and therefore find the value of x. This means we need to isolate x to find a value for it. To do this we use the reverse rules for BIDMAS whereby the first s...
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Answered by Bilal B. • Maths tutor
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(IGCSE, Jan 2013, q8 adapted) The astronaut David Scott dropped a hammer and a feather from rest, at the same time and from the same height on the moon. The hammer and the feather landed at the same time. Why?

Central to this question is an understanding of the difference between an accelerating object and an object travelling at terminal velocity . Firstly, the experiment is carried out on the moon, which means w...
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Answered by Nadya K. • Physics tutor
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In what ways did the lives of black Americans change during WWII?

The change brought by the war for black Americans was limited and contested. The war presented new demands for labour, generating opportunities for African Americans (AA) to economically participate, gain sk...
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Answered by Abigail S. • History tutor
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Explain the unusually high boiling point of HF

Due to the high electronegativity of flourine hydrogen bonds can be formed between HF molecules. - Hydrogen bonds require more energy to break that London Forces. - The other halogens are not as electronegat...
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Answered by Chloe G. • Chemistry tutor
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