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In Science

Is leaves going yellow a physical or chemical change?

Very complex chemical changes cause the yellowing of leaves. Primarily, the green chlorophyll breaks down leaving some of the yellow colours which were hidden, e.g. xanthophyl (MORE)
In Science

Slowest to fastest what is the relative rate of diffusion of the gases?

The less dense a gas is the faster it diffuses. Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass. F (MORE)