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How do I solve the Hannahs sweets question from the 2015 GCSE paper?

Here is a question from the 2015 edexcel GCSE paper that was considered particulary challenging. There are n sweets in a bag. 6 of the sweets are orange. The rest of the sweets are yellow. Hannah takes a ran...
MR
Answered by Miranda R. • Maths tutor
14068 Views

How Do I Deal With Cartoon Source Based Questions?

Source based questions can often appear intimidating, however interpreting a source accurately is a key skill that no good historian can do without. When it comes to cartoons the first thing to do is to iden...
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Answered by James L. • History tutor
11612 Views

What should I include in an English Literature poetry analysis?

The first step to writing a good essay is to carefully read the poem. From here it is a good idea to highlight the different literary devices the poet uses. These can include: similes/ metaphors, personifica...
HF
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If 20 kg of calcium carbonate was reacted with excess sodium chloride in the following reaction (2NaCl+CaCo3-->Na2Co3+CaCl2) what is the maximum mass of sodium carbonate that could be made?

1)Always write out the reaction first; 2NaCl+CaCo3-->Na2Co3+CaCl2 2)Now underneath calculate the Relative Formula Mass using a periodic table for each of the compounds. CaCo3=100/ Na2Co3=106 3)Now always ...
AR
Answered by Andrew R. • Chemistry tutor
13024 Views

Describe how the structure of alveoli in the lungs enables efficient oxygen supply during aerobic respiration?

The alveoli are sac like structures which have a large surface area to volume ratio allowing for fast diffusion of oxygen into the blood (Fick's law). This large SA:V ratio is generated because the alveoli h...
PB
Answered by Philip B. • Biology tutor
7636 Views