Can carbon be composed of more than one substance?

Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound.Compounds made primarily of carbon and hydrogen atoms are called organic compounds, and all others are called inorganic compounds.

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answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.