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How does cholera cause diarrhoea and dehydration?

Cholera is single-celled organism that produces a toxin. The toxin attaches to the ion receptors in the small intestine which causes it to secrete chloride ions into the lumen. This then causes water to move...
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Answered by Madhangi P. • Biology tutor
24937 Views

Calculate the value of 2^(–3) as a fraction in its simplest form.

To calculate the value of 2 -3 first we know that a negative exponent is equivalent to the inverse of the same number with a positive exponent. Therefore 2 -3 = 1/2 3 , the next step is to calculate 2 3 , 2 ...
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Answered by Joseff S. • Maths tutor
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Calculate the largest share when £400 is shared in the ratio 1 : 2 : 5.

To calculate the largest share, first we need to find out how much each part that makes up a share is worth. To find out how much the smallest part is (i.e 1 part), we divide the value £400 by the sum of the...
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Answered by Joseff S. • Maths tutor
26225 Views

Explain why average bond enthalpies can be used for cyclohexane but not for benzene

Benzene has a resonance structure while cyclohexane consists of only single bonds of the same length. Benzene's resonance structure means it has intermediate bond lengths and strengths. This means average bo...
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Answered by Chloe M. • Chemistry tutor
4435 Views

Calculate the pH of a 4.00 x 10^-2 mol dm^-3 solution of Ba(OH)2

The easiest way to answer this question is by using the equation pH + pOH = 14. Firstly, we need to work out the number of moles of OH - in the solution. As the formula for Ba(OH) 2 shows that it has 2 moles...
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Answered by Chloe M. • Chemistry tutor
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