In a low concentration reaction, the particles are spread out. They collide less often, so there are fewer successful collisions.
In a high concentration reaction, the particles are crowded close together. They collide more often, so there are more successful collisions.
Increasing the pressure of reacting gases also increases the frequency of collisions.
Concentrations of solutions are given in moles per cubic decimtre (mol/dm)
Equal volumes of solutions of the same molar concentration contain the same number of moles of solute, i.e the same number of particles.
Equal volumes of gases at the same temperature and pressure contain the same number of particles.
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