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  • Chemical and Physical Changes
  • Let's review what physical and chemical changes are: • A chemical change is a change that occurs on the molecular level to the matter. • A physical change is a change that doesn't affect the molecules that make up the matter.
  • Personal Example One example of a chemical change is this campfire as many people probably had in their lives at one point or another in their lives. The fire is indicator of a chemical change has occurred showing flammability, one of the properties of a chemical reaction. In this case, a campfire is burning, which cause the carbon from the log to combine with oxygen, thus creating a chemical reaction.
  • Real Life Example Ouch! One example of a chemical change in the real world is acid rain. Since the effects of air pollution is now everywhere, people can feel the effects of acid rain. In this case, this acid rain is caused by nitrogen spewed out by the factory. The nitrogen reacts with the hydrogen and oxygen, creating acid rain.
  • Personal Example Wow, looks good. A bowl of cereal is an great example of a physical change. The milk mixes with the cereal and causes a physical change since they are mixed together. The milk stays as milk and the cereal stays as cereal. This also shows that some physical changes cannot be reversible.
  • Real Life Example Oh look, that's a big rock. That rock looks like it has been through many physical changes. It has undergone a lot weathering. The rock stays a rock but it changed shape. Because there is no molecular changes, it is a physical change
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