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16 Cards in this Set
- Front
- Back
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Chemical change |
Change the substance to a new one. |
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Physical change |
Only change the appearance |
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Sign of chemical change |
Color change and temperature, production of smell and gas, permanent, use heat. |
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Sign of physical change |
Become smaller piece (cut). Change shape, (temporary). |
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Cutting paper |
Physical |
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Melting butter |
Physical |
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Breaking glass |
Physical |
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Rusting |
Chemical |
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Fire |
Chemical |
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Cooking |
Chemical |
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Why do simple covalent molecule have low MP and BP? |
Because they have weak bonds between the molecule. |
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Simple covalent molecule that is solid in room temperature |
Molecular solid |
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Properties of simple covalent molecule? |
Low MP and BP Soft and brittle (Weak force between molecule^) X conduct electricity (No free electron^) |
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Different form of the same element. |
Allotropes |
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Properties of Giant covalent structure |
Hard High MP and BP X conduct electricity (Strong bond) |
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Properties of graphite |
Soft and slipper (Slide between layers because weak attraction) Can conduct electricity (Have free electrons) |
