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Vegetable oils are unsaturated because they contain lots of carbon-carbon double bonds. If we react them with hydrogen at 60oC in the presence of nickel catalyst they will become saturated, also called ha...

To find the gradient of the tangent, we can differentiate to give dy/dx=3x^2+9. We can now put in x=2 to find the gradient at (2,1): 3(2)^2+9=21. Therefore the gradient is 21 at (2,1).

First bring all the x terms to one side by taking 5x from each side, this gives 2x-4=8. Now put all the number terms on the other side by adding 4 to each side, this gives 2x=12. We can now divide both si...

Name of country: Japan 

Japan has a population of 127 million and roughly 23% are over the age of 65 and this huge proportion can prove to be problematic. In general, the elderly require more expen...

A virus is an example of a pathogen. Pathogens also include bacteria, fungi or protists, and all are capable of causing infectious disease. Viruses are very small, much smaller than bacteria. They consist...