Top answers

Calculate the percentage, by mass, of carbon in sodium hydrogencarbonate (NaHCO3)

When faced with this style of problem there are steps to correctly answer the quesion: Step 1 - identify the atomic mass of carbon Step 2 - calculate the atomic mass of the compound Step 3 - work out the per...
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Answered by Hayden T. • Chemistry tutor
44084 Views

Why is the human circulation em called a double circulation system?

In the double circulation system there are two routes that the blood can take: 1. Through the lungs 2. To the rest of the body The blood starting in the heart has no oxygen in it. It flows from the heart and...
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Answered by Elizabeth L. • Biology tutor
16730 Views

What is the difference between osmosis and active transport?

First of all we have to understand that there are concentration gradients between cells and the outside. A higher concentration of solute is when there is more solute (eg salt) dissolved in the solvent (e.g ...
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Answered by Elizabeth L. • Biology tutor
54756 Views

How do I write a history essay?

This can be variable depending on your exam board, and what your teacher wants from you, but there are some things that never change. Structure and Plan It's best to begin the essay with a structure in mind....
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Answered by Giulia Z. • History tutor
4270 Views

What happens to the blood when it enters the heart?

The heart has four chambers; the right ventricle and atrium, and the left ventricle and atrium. Deoxygenated blood, once it has travelled the entire body, enters the heart from the vena cava into the right a...
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Answered by Giulia Z. • Biology tutor
4699 Views