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Describe how a student wouldn’t test for the presence of lipid molecules in a sample of food

The student would conduct an emulsification test. First of all, crush the sample to increase is surface area. Next add the sample to a test tube of ethanol, allowing for he sample to disolve before adding a ...
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Answered by Tobias S. • Biology tutor
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What is the difference between the past tenses (perfect, imperfect and pluperfect)?

The perfect tense (simple past) is used to describe a completed action. It is formed by an auxiliary verb (either être or avoir) and a past participle. The imperfect is used to describe an action which began...
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Answered by Verity S. • French tutor
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What is the subjunctive and when is it used?

The subjunctive is a “mood” it demonstrates possibility and is used in certain grammatical structures. There is no pattern to these - you just have to learn them! The most common are: purpose clause (followi...
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Answered by Verity S. • Latin tutor
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A useful practice: how to determine the number of solutions of a system of linear equations beforehand

We have a system of n linear equations incorporated by A x = b , with A being a n x p matrix of numeric coefficients, x being a p-dimensional column vector of variables and b being a numeric n-dimensional co...
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Express 1/(x(1-3x)) in partial fractions.

1/(x(1-3x))= A/x+ B/(1-3x) 1= A(1-3x) + B(1-3x) when x=0 1=A when x= 1/3 1=B/3 so B=3 1/(x(1-3x))= 1/x + 3/(1-3x)
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Answered by Laura B. • Maths tutor
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