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What is one piece of advice you would give to students taking the UKCAT?

The main difficulty that most people have with the UKCAT is finishing on time due to the strict time restrictions. In reality, not many people are going to be able to give proper thought and answer all the q...
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Answered by Brian P. • UCAT tutor
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How does increasing the temperature of the reactants in a reaction affect the rate of said reaction?

This is a typical GCSE chemistry question relating to collision theory. Collision theory states that for a reaction to occur, the reactant particles must collide at a sufficient level of energy. To answer th...
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Answered by Brian P. • Chemistry tutor
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Solve the simultaneous equations: 6a + b = 16 and 5a - 2b = 19

Rearrange the first equation to give b as the subject. b = 16 - 6a Then substitute that equation for b into the second equation. 5a - 2(16 - 6a) = 19 Simplify this equation (remembering to take account of th...
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Answered by Francesca L. • Maths tutor
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An electron of mass 9.11x10^(-31) is fired from an electron gun at 7x10^6 m/s. What size object will the electron need to interact with in order to diffract?

Momentum of electron=mv=6.377x10^ -24 kg m/s λ=h/mv=6.63x10 -34 /6.377x10 -24 =1.039...x10 -10 = 1x10 -10 m
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Answered by Jozefina G. • Physics tutor
4139 Views

Complete this substitution question: x^​3 - 25 = 103 - x^​3

Firstly, let's move the x^​3's onto the same side (and preferably keep them positive). Let's add x^​3 to both sides, which means the RHS will now read '2x^​3 - 25' and the LHS will read '103'. Next we want t...
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Answered by Aoife J. • Maths tutor
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