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What is an acid?

An acid is a substance which releases hydrogen ions (protons) when added to water. pH values of less than 7 are considered acidic, with 1 indicating it is a strong acid.
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Answered by Ellie W. • Chemistry tutor
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How do I write literary analysis?

Literary analysis involves closely evaluating a text and using evidence from it to support an argument. First of all, you need to make an argument. Read the question carefully and think about how you can use...
HC
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Solve the simultaneous equations x - 2y = 5 and 5x + 4y = 11

We can solve simultaneous equations one of two ways. We can either substitute one equation into the other or we can eliminate one of the unknowns only leaving us one to deal with. I will explain both methods...
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Answered by Amy T. • Maths tutor
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Explain how a substitution mutation could cause an enzyme not to work (5)

The mutation changes the order of bases so there is a different triplet code present. This results in a different amino acid being coded for in the polypeptide chain. This means a different protein with a di...
EC
Answered by Evie C. • Biology tutor
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"Transnational Corporations (TNCS) only bring disadvantages to their host country" To what extent do you agree? (9)

Intro- define key terms TNCs are large corporations that operate in more than one country. A host country is defined as a country that a TNC has chosen to establish part of its operations in. Para 1- agree w...
EC
Answered by Evie C. • Geography tutor
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