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Outline how a student could identify between an aldehyde and a ketone, and state the result they would observe.

There are two possible answers here. 1) Add Tollens reagent - the student would see a silver mirror form in the test tube containing the aldehyde. 2) Add Benedicts reagent - te student would see a brick red ...
AG
2603 Views

Briefly explain how Darwin formulated his theory of evolution by natural selection.

Darwin made four key observations in his studies of wild populations: members of a population of the same species vary in their traits; traits can be inherited, or passed from parents to offspring; populatio...
ZL
Answered by Zak L. • Biology tutor
3703 Views

2x^2-6x+5 can be written in the form a(x -b)^ 2 + c where a, b and c are positive numbers. Find a,b and c.

In order to solve this problem we must first complete the square. To complete the square we need to factorise the equation to get the coefficient of x to be 1. This gives: 2(x^2-3x)+5. We then need to comple...
CH
Answered by Chloe H. • Maths tutor
24102 Views

Solve the following simultaneous equations for x and y. 2x+5y=9 and 4x-3y=7

Here the best method to use will be elimination since using a substitution for x or y may produce some nasty fractions. The first thing to look for is that the 2x and 4x are nice multiples of each other. As ...
JG
Answered by Jamie G. • Maths tutor
8617 Views

When writing my essay, how do I reach the highest marks?

In order to achieve a high mark, it is important for you to include all the assessment objectives in a well-distributed fashion. While writing your essay a good tip is to quickly note down the AOs in the cor...
TD
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