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Find the concentration of calcium carbonate given that 25cm^3 of CaCO3 is neutralised by an average of 14cm^3 of 0.1 molar HCl .

Initially it helps to read over the question a couple of times underlining/ highlighting all important information ie. volumes and concentrations. Next it always helps to have a chemical equation to work wit...
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Answered by Jan O. • Chemistry tutor
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Explain BF Skinners theory of Behaviourism

Skinner believed that children learn language in the same way that they learn their other behaviour and stated that this was through a system of positive and negative reinforcement. When a child imitates the...
KM
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The equation of the line L1 is y = 3x – 2 The equation of the line L2 is 3y – 9x + 5 = 0 Show that these two lines are parallel.

In this question, you are being asked to show L1 and L2 are parallel. The equations of two parallel lines will have the same gradient. This is the number in front of the x term in the equation, but to compar...
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Answered by Abigail W. • Maths tutor
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Discuss the evolutionary order of appearance of the mitochondrion, chloroplast and ribosome, explaining your reasoning

By considering which organisms have each of the referred organelles, we can infer their evolutionary order of appearance.Ribosomes are present in every living cells, whereas mitochondria and chloroplasts are...
MP
Answered by Maria P. • Biology tutor
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What is the Cosmological argument?

The cosmological argument is effectively an argument that states the very existence of the universe is strong evidence for the existence of God. This argument is 'a posteriori' (meaning that it is an argumen...
CF
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