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22 Cards in this Set
- Front
- Back
Chemistry |
The study of the properties of matter and how matter changes |
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Substance |
Single kind of matter that is pure and has a specific set of properties |
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Every form of matter has two kinds of properties. What are they? |
Physical properties and chemical properties |
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What are examples of pure substances |
Table salt, table sugar, and baking soda |
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Things that are not pure substances |
Flour, baking powder, milk, eggs, and fruit |
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Physical property |
A characteristic of a pure substance that can be observed without changing it into another substance. |
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Chemical property |
A characteristic of a pure substance that describes its ability to change into different substances. |
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What are some examples of physical properties? |
1. Icicles of solid water will change to liquid. 2. Metal becomes a shiny, flexible toy when shaped into a flat wire and coiled 3. Bumpy texture, bright colors are physical properties of a chameleon. |
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What are some examples of chemical properties? |
1. Gases produced during baking create spaces in freshly made bread. 2. Wood fuels a fire, producing heat, gases & ash. 3. Iron can form rust |
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Elements Are……. |
the simplest substances |
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Atom |
The basic particle from which all elements are made. |
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Water Molecule |
has two hydrogen atoms and 1 oxygen atom |
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Oxygen Molecule |
has two oxygen atoms |
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Carbon dioxide molecule |
One carbon atom and two oxygen atoms |
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Compound |
a pure substance made of two or more elements chemically combined in a set ratio |
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Chemical formula |
shows the elements in the compound and the ratio of atoms |
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Formula for carbon dioxide |
CO2 |
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Mixture |
Made of two or more substances |
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Heterogeneous Mixture |
A mixture that you can see the different parts |
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Example of a heterogeneous mixture |
Moist soil, a salad |
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Homogeneous Mixture |
A mixture in which the substances are so evenly mixed that you can't see different parts. |
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Example of a homogeneous mixture |
sugar dissolved in water |