As a phase change occurs when energy is removed or added to a system, the temperature of the substance stays constant because some substances reach a maximum temperature and will not get hotter.

energy is being used to change the chemical composition of the substance.

energy is moving too quickly for the thermometer to register a change

energy is being used to make or break bonds between molecules.

energy is being used to make or break bonds between molecules

Explanation:

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a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.