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The bond angle is 104.5 degrees. This is because of the pairs of electrons around the oxygen atom: it has 2 bonded pairs and 2 lone pairs. Lone pairs and bonded pairs of electrons repel each other. Howeve...
To complete the square you compare your equation in the form x2 + bx + c = 0 to a similar equation of (x + b/2)2...
Are we comfortable with an integral being the area under a curve on a graph? Well we'll draw a curve and think about how we could estimate this area. Would you agree that we could chop up the area under t...
Firstly, it is important to recognise that the answer will need to be in the form of two pairs of brackets because the question is asking us to factorise a quadratic equation. The equation only has a sing...
This is one of those questions that doesn't have a straightforward answer and it is only through experience of the language that one learns the gender of each noun. However, there are some noun endings th...
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