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Explain how enzymes work in reactions (3 marks)

Enzymes catalyse reactions by reducing the activation energy required to begin a chemical reaction, without being used up in the reaction. They bind to the active site of a substrate to form an enzyme-substr...
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Answered by Lucy P. • Biology tutor
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How can you tell the environment a sedimentary rock is deposited in?

The first stage in the formation of a sedimentary rock is the deposition of sediment. The size, shape and type of sediment can tell you lots about the depositional environment. In a high energy environment, ...
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Answered by Holly U. • Geology tutor
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Explain the impact that a rise in the world price of oil might have on aggregate supply and gross domestic product (GDP) in an economy

Aggregate Supply is the total quantity of goods and services produced in an economy over time. In the neo-classical AD-AS model, the short-run aggregate supply (SRAS; total quantity of goods and services pro...
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Answered by Doncho A. • Economics tutor
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Potassium forms an ionic compound with sulfur. Describe what happens when two atoms of potassium react with one atom of sulfur. Give your answer in terms of electron transfer. Give the formulae of the ions formed. (5 marks)

electrons, which are negative particles that are part of the atom, are transferred from potassium to sulfurtwo potassium atoms each lose one electron and they form K+ ions as they have lost negative charge s...
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Answered by Alisha M. • Chemistry tutor
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How can I prove that an angle in a semi-circle is always 90 degrees?

If we take the diameter of a circle and create an angle on the circumference at point C of the circle from the two points where the diameter meets the circumference (points A and B), the angle created will a...
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Answered by David W. • Maths tutor
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