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What is crude oil and how does fractional distillation work?

Crude oil is formed from detritus (dead living matter) of animal, plants and microscopic organisms under intense pressure and temperature. It is trapped under impervious rocks which stop the liquid and gas f...
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Answered by Amelia H. • Chemistry tutor
6201 Views

When do I use the French subjunctive?

The subjunctive mood (NB: NOT tense) in French is primarily a means of expressing uncertainty - something that you wish, hope or fear, rather than something that is definitely the case. This textbook-style d...
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Answered by Sarah M. • French tutor
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In Seamus Heaney’s poem ‘Digging’, how does the poet express admiration for his father?

In ‘Digging’, the first poem in Seamus Heaney’s first collection Death of a Naturalist , the poet dramatises the moment he decides to dedicate his life to writing poetry. Exploring the emotionally complex re...
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Answered by Ciarán W. • English tutor
13174 Views

What is the difference between the nominative case and the accusative case?

The nominative case is used to refer to who/what is doing the action, whilst the accusative case is used to refer to who/what the action is done to . Take for example the following sentence: Die Frau liest e...
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Answered by Belle L. • German tutor
33171 Views

Explain Ohm Law

V = I * R where V is a voltage, I is current and R is resistance. This law says voltage is directly proportional to current and resistance.
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Answered by Waqar S. • Electronics tutor
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