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How would you test for the presence of a phenol?

By adding Iron (III) Chloride to the solution and if it turns purple, it means a phenol is present. 

RN
Answered by Rebecca N. Chemistry tutor
9367 Views

Explain one consequence of a more globalised world?

  • More interdependency 

  • More free trade

  • Increased competition

SC
Answered by Saqlain C. Economics tutor
1752 Views

What is a condensation reaction?

A condensation reaction is the formation of a chemical bond between two molecules with the elimination of a water molecule. You can tell this reaction has occurred when you see an equation written down as...

RN
Answered by Rebecca N. Biology tutor
4490 Views

What is the difference between pH and pKa?

pH is the measure of the concentration of proton in an aqueous environment, which is denoted as: pH = -log[H3O+]. pKa however, is prefered when comparing how strong an acid is becaus...

AM
Answered by Anthony M. Chemistry tutor
7704 Views

How do you know when to use sin, cos and tan?

First draw the triangle and label all the information you have as well as the unknown angle or side length. There should be at least one angle labelled with some informtion - use this angle to label the o...

AW
Answered by Anna W. Maths tutor
88782 Views

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