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The first thing that I would do when approaching an unseen extract is to read the extract all the way through without making any notes - this will allow you to gain a complete understanding of the text and w...

Both molecules have a C-Br bond, which will be polar due to their difference in electronegativities (bromine is more electronegative than carbon). In CBr3CBr3 the dipoles cancel so the overall molecule is no...

Spanish has two past tenses: preterite and imperfect. Most verbs can be put into either tense, depending upon the meaning. Generally speaking, the preterite is used for actions in the past that are seen as c...

For this we have to use trignometric identities, e.g Tan(x)= sin(x)/cos(x), sin 2 (x) + cos 2 (x) = 1, 1/sin(x) = cosec(x) tan(x) + cot(x) = sin(x)/cos(x) + cos(x)/sin(x) = [sin 2 (x) + cos 2 (x)]/sin(x)cos(...

Standing waves are produced from the superposition of 2 progressive waves with the same wavelength, travelling in opposite directions. The pattern consists of nodes and antinodes. Nodes are formed from destr...