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Matter occurs in three states, or forms – solid, liquid, or gas. A change of state occurs when a substance is transformed from one state of matter to another. Such a change is sometimes referred to as a phase change. The state a particular type of matter takes depends on its temperature. For matter to change from one state to another, there must be a change in temperature. Each kind of matter has a particular temperature at which it will change state. The melting point is the temperature in which a substance changes from a solid to a liquid. 1. Make a dessert by melting chocolate. 2. Take a picture of your dessert. 3. Use the app of your choice to describe the dessert and the change in state.