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What factors change the rate of diffusion? (3) and what is the relationship between these factors? (1)

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 diffusionConcentration g...
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Answered by Aneisha D. • Biology tutor
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A coal fire is burning in the bottom of a furnace, with a chimney above it. Air moves into the furnace from an opening at the bottom and up the chimney. Describe how the process of convection causes this air movement.

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 chimne...
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Answered by James B. • Physics tutor
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How did the role of women change in American society before the second world war?

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 account...
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Answered by Amelia H. • History tutor
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Solve the simultaneous equations: a) 2x + y = 18, b) x - y = 6

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 equation...
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Answered by Rebecca C. • Maths tutor
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Why does ozone absorb a broader range of wavelengths of UV light than oxygen?

Covalent molecules such as oxygen and ozone absorb different ranges of UV light mainly due to differences in the types of bonds that make up their structure. It is therefore useful to first consider the Lewi...
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Answered by Eleanor S. • Chemistry tutor
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