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A sample of matter that has definite chemical and physical properties. A sample of matter that has definite chemical and physical properties
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tarix | 03.11.2018 | ölçüsü | 4,52 Mb. | | #77873 |
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A sample of matter that has definite chemical and physical properties. A sample of matter that has definite chemical and physical properties.
pure substance that cannot be separated into simpler substances by physical or chemical means. pure substance that cannot be separated into simpler substances by physical or chemical means.
Table Salt NaCl (sodium chloride) Table Salt NaCl (sodium chloride) Chalk CaCO3 (calcium carbonate) Rust FeO (iron oxide) Carbon Dioxide CO2
A combination of two or more pure substances that are not chemically combined. substances held together by physical forces, not chemical No chemical change takes place Each item retains its properties They can be separated physically
Two groups: Two groups: - Heterogeneous mixtures - substances that are not distributed evenly throughout the mixture; you can see the different parts
- Examples: chicken noodle soup, oil and water, orange juice with pulp and ice cubes
- Homogeneous mixtures (ALSO KNOWN AS SOLUTIONS) - substances that are evenly distributed throughout the mixture; you canNOT see the different parts
- Examples: blood, coffee, pulp-free orange juice, salt water
You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture. Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. - A mixture can contain both elements and compounds.
Rocks
Copper
Jelly Beans
Table Sugar
Tea
Salt
Neon Gas
Salad
Pure Water
Aluminum
Lemonade
Silver
Sand
Rocks
Copper
Jelly Beans
Table Sugar
Tea
Salt
Neon Gas
Salad
Pure Water
Aluminum
Lemonade
Silver
Sand
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