Properties and Reactions of Substances

Properties and Reactions of Substances - Notes...

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Notes: Properties/reactions of substances We need to learn about substances and their reactions/properties in order to make a hot pack. A physical property is a characteristic that can be observed or measured without changing the identity of the substance. These properties include melting point, malleability, color, and also smell. In our investigation, we observed iron and sulfur. We found that iron was gray and didn’t have a smell where the sulfur was yellow and smelled bad. A chemical property relates to a substance’s ability to undergo changes that transform it into a different substance. So, these changes can’t be observed unless you end up with a different substance than you started with. For example, if you expose iron to oxygen, the iron will undergo a change and become rust. You can see the change and you end up with a different substance. Also, we need to know the difference between a physical reaction and a chemical reaction before making a hot pack. A physical reaction is a change in the substance that doesn’t involve a change in the identity of the substance, such as grinding, melting, boiling, and mixing. An example of this is if you can mix to different substances and separate them by physical means. A chemical reaction is a change in which one or more
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