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The perfect tense is used to talk about something that happened in the past. It's an action that is completely finished. Some verbs take the auxillary 'être' to form the perfect tense. Firstly, we need to...

Temperature - The higher the temperature the faster the movement of particles so there is an increased rate of diffusion and conversely lowering the temperature decreases the rate of diffusionConcentratio...

The air is heated by the coal fire. This causes the air to expand as the molecules move further apart. As a result the air becomes less dense. The less dense air rises. The cooler air from outside the chi...

When answering this A Level essay question, it is important not to analyse women as a single homogenous group. Factors such as race, socio-economic position, and family structure should be taken into acco...

Notice we have two different equations but that 'x' and 'y' take the same value in both equation a and equation b. In order how to work out what values they take we need to combine the two different equat...