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State what is meant by isotopes?

Isotopes are atoms with the same number of protons, but a different number of protons. Therefore, isotopes have the same atomic number but a different mass number. An example of an isotope is carbon-13, an i...
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Answered by Charlie H. • Physics tutor
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Compare the advantages and disadvantages of the two methods of generating electricity (figure 1 in answer):

Figure 1 (AQA GCSE Science A Physics: Higher Tier): The wind turbine costs £50 000 to buy and install. The hydroelectric generator costs £20 000 to buy and install. The average power output from the wind tur...
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Answered by Charlie H. • Physics tutor
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How do I know whether to use Ser or Estar?

Ser and Estar are a common problem for beginners and more advanced learners alike. They both mean "to be", but are used for different things. Ser is used to... ...describe innate, fixed or "un...
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Answered by Stephanie B. • Spanish tutor
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Compare and contrast classical and modern social liberalism.

Liberalism is the 'essentially contested concept' or ideal which dominates western political discourse, both explicitly and inexplicitly (Gallie). Political theorists often make the distinction between 'clas...
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Suggest what happens in heart muscle cells when the coronary artery gets blocked.

'Coronary' refers to heart, and coronary arteries supply heart muscle cells with blood. Firstly consider why we need to transport blood around the body? Blood carries many essential nutrients and components ...
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Answered by Elizabeth L. • Biology tutor
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