Finally! It's the weekend now we can relax and do our science review!! Oh ya..science review. Anyways, here's a short summary of the pages assigned by Ms.Chen to read and take notes on. Enjoy.
2.3 Characteristics of Pure Substances p.28
- Pure substances have a constant boiling point
- Mixtures ordinarily don't have a constant boiling point (however, a few do)
- Freezing Point: The temperature a liquid changes to solid
- Melting Point: Temperature a solid turns into a liquid
2.4 Chemical and Physical Changes p.30
- Density: Property of matter that describes its mass per unit volume
- Sugar and Baking powder do not have a melting/freezing point because a new substance is formed when
heated or cooled.
- Chemical Change: Changes that produce a new kind of matter and cannot be reversed. (ex.Cooking an Egg)
- Decomposition: One kind of matter decomposes to form 2 or more kinds of matter.
- Melting: Change of a solid to a liquid without the formation of a new kind of matter. (Ex. Melting ice.)
- Physical Changes: Changes that are easily reversed to get the original material back again.
2.7 Atoms p.36
- Atom: The smallest possible piece of something
- Not visible
- Idea of atoms in matter began in the 1800s
Thanks for reading. :)
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