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Describe the characteristics of oceanic crust. (AQA Past Paper, 3 marks)

There are two types of crust we need to know about: Oceanic crust and Continental crust. Oceanic crust is formed at mid ocean ridges where two plates pull apart. Here magma from the mantle upwells. When it r...
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Answered by Katie G. • Geography tutor
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Where do electrons go in an atom?

Electrons are spread around the atom, in layers outside of the nucleus (which holds the protons and the neutrons). These layers are called shells. The innermost shell can only hold 2 electrons, the other she...
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Answered by Kathryn B. • Chemistry tutor
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What is the difference between an alkane and and alkene

An alkane is a chain of carbons connected together by single bonds (-C-C-C-C-C-). All carbons have to have 4 bonds, so the carbons in the middle of the chain are attached to two other carbons, and two other ...
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Answered by Kathryn B. • Chemistry tutor
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Identify and explain the trend in atomic radius across a period

The atomic radius across a period in the periodic table tends to decrease from left to right. As you move across a period the number of electrons from one element to the next increases by one. The electron i...
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Answered by Olavo M. • Chemistry tutor
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Differentiate x^3 + y^4 = 34 using implicit differentiation

An implicity function is one that is not expressed in the form y = f(x) such as the equation in the question. Instead of rearranging the equation to make y the subject, the equation can be differentiated usi...
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Answered by Olavo M. • Maths tutor
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