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Comprehension of a text followed by questions

In the speaking sections of a French A level exam, I would encourage the student to make sure he or she has understood the content of the text, the main characters, locations and the action described. Then, ...
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Answered by Elena V. • French tutor
2940 Views

An ideal gas undergoes a transformation in which both its pressure and volume double. How many times does the root mean square speed of the gas molecules increase?

In solving this, the ideal gas law must be considered (pV=nRT). Since both the pressure and volume of the gas have doubled, the product p*V (pressure times volume) has increased four times from the initial t...
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Answered by Andrei R. • Physics tutor
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Give the reagents and conditions needed to convert a secondary alcohol into a ketone. Name the process which occurs during the conversion.

Reagents: Potassium dichromate and concentrated sulfuric acid (catalyst) Conditions: Heat under reflux The process which happens when a secondary alcohol is converted to a ketone is called oxidation.
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Answered by Lucy S. • Chemistry tutor
5935 Views

Consider a differential equation where dx/dt = -axt. Find an equation for x(t).

Starting from dx/dt = -axt. We treat dx and dt as infinitessimal factors of x and t, therefore fundemental mathematical operations still apply. Rearranging the equation to group x, dx and t, dt. 1/x dx = -at...
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Answered by Cal L. • Maths tutor
5221 Views

How do you expand brackets? eg. (2x+3)(3x+4)

Use the FOIL method for: (2x+3)(3x+4) F irst e.g. multiply first two numbers (2x and 3x) O utside e.g. 2x and 4 I nside e.g. 3 and 3x L ast e.g. 3 and 4
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Answered by Naba C. • Maths tutor
6190 Views