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List the following compounds in order of increasing acidity in aqueous solution, giving reasons for your choices: HCl, HI, HBr, HF.

The acidity of a compound is measured by its pKa, which is defined as: pKa=-log([H + ]) ([H + ] is the concentration of H + in solution). As [H + ] increases, pKa decreases, meaning strong acids have low pKa...
PS
Answered by Promeet S. • Chemistry tutor
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Why does adding a constant to a function's input (as in f(x-a)) shift the plot of the function along the x-axis?

Imagine the function f(x) as a black box which takes in any value x and produces an output y. The black box acts on its input according to a rule which produces a unique value of y for a given x. If the blac...
JH
Answered by James H. • Maths tutor
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I'm applying to study a subject I have never studied before; how can I show universities I am a good fit for this degree?

Universities are interested in who you are as a person, not just as a results sheet. University is a time to finally focus on studying something you are truly interested in, so you need to show through your ...
LM
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Solve the following definite integral: f(x)=3e^(2x+1) for the limits a=0 and b=1, leaving your answer in exact form.

First set up integral. Do not forget dx! Int(f(x)) between 0 and 1 Optionally take out factor of 3 to simplify problem. Solve using substitution and the exponential rule. Integrated function should be (3/2)e...
FB
Answered by Fraser B. • Maths tutor
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How do you convert between fractions, decimals and percentages?

For example, 7/10 is the same as 0.7 and 70%. Percentages are actually all fractions out of 100. 70% is 70/100, 50% is 50/100, etc. When these are written as fractions they should be simplified so the denomi...
ED
Answered by Elena D. • Maths tutor
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