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I will be talking about the particle theory and how heat is produced and i will also talk about the atoms and molecules

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Particle theory is when matter is made up of small particles.

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There are many  ways heat is produced like burning, rubbing and mixing one substance with another. The motion of atoms and molecules. Heat can be moved by conduction. Heat is energy.Heat energy is converted to kinetic energy . There are three ways heat can be transfered. Those are conduction, conversion and radiation.

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Mixtures are made up of two or more substances. Some mixtures examples are ice cubes in a drink and sand and water. There are two types of mixtures and those are heterogeneous mixtures and homogeneous mixtures.

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When heat is added to a substance, the atoms and molecules move faster and vibrate.

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Solid changes into liquid and liquid changes into gas.  Volume of gas increases more than the volume of solid and liquid..