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Sagot :
Matters are composed of particles that are constantly moving. The kinetic energy defines the intensity of these movements. When particles are moving more, the kinetic energy is higher. If we heat a substance, the kinetic energy will be higher because we will be giving more thermal energy, which is going to be transformed in kinetic energy and make the particles move faster and further apart. A gas is a substance with particles that are distant to each other and moving fast, so it has a higher kinetic energy. When it cools down, it may precipitate as a liquid, because with less heat the particles will be moving less and getting closer to each other. So, liquids has a lower kinetic energy than gases. Once the substance is solid, it means that the particles are moving really slowly and are very close to each other, so solid is the state of matter with the lower kinetic energy of all states of matter. Therefore, the correct answer is d) solid, because the motion of solid particles is slow.
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