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Which Ion from Na+ and Mg2+ has a smaller atomic radii? Explain why?

The smaller ion of the two would be Mg 2+ . Both ions have the same electronic arrangement so the amount of shielding occuring for both ions is the same. The key difference between the ions that causes the M...
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Answered by Tanvi B. • Chemistry tutor
21279 Views

How can I show my enthusiasm for my subject?

The best way to do this is prove your interest. Rather than simply saying that you are passionate, demonstrate it in a way which shows you have gone beyond what you would be expected to do in school. You cou...
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Given that y=x^3 +2x^2, find dy/dx . Hence find the x-coordinates of the two points on the curve where the gradient is 4.

First of all we are asked to differentiate the function. This can be easily done by multiplying the coefficient of x by its exponent, and then decreasing the exponent by one. Therefore, dy/dx=3x^2+4x We are ...
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Answered by Imran H. • Maths tutor
16417 Views

Explain the roles of ATP and calcium ions in muscle contraction. (4 marks)

The hydrolysis of ATP provides the energy necessary to break the cross-bridges formed between actin and myosin heads. The hydrolysis of ATP is also used to provide the energy for the power stroke, which is w...
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Answered by Rachel H. • Biology tutor
26023 Views

The numbers 6B and 12 are displayed in hexadecimal form. Convert them into binary form and perform binary addition to find the sum. Convert your answer back into hexadecimal. Show your workings.

The first step is to work out what 6B and 12 are in binary. Starting with 6B , we need to find a four-bit representation of both 6 and B. 6, converts straight to its binary form, simply by adding 1s to the 4...
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Answered by Ben C. • Computing tutor
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