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14 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Mechanical mixture |
Heterogeneous can see the different parts of the mixture |
Granola gravel salt and pepper mixed |
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Solution |
Homogeneous all appears to be one substance but it is really more than one |
Vinegar pop tea glass |
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Elements |
Cannot be broken down any further |
Copper nickel hydrogen |
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Compounds |
Two or more elements combined in a definite proportion can be broken down into elements |
H2O (water) CO (carbon monoxide) |
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Chemical formula |
When we combine the chemical symbols to represent a particular compound |
Water= H2O or hydrogen peroxide=H2O2 |
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Physical changes |
Change only in the way it looks |
Liquid water turning into ice or cutting up a carrot |
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Chemical changes |
One or more new substances is created |
Mold growing on cheese or rust on a car |
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Reactants and products |
In a chemical reaction something new is made (product) and something is used up (reactants) |
Reactants {Water + iron + oxygen} = rust (product) |
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The Law of conservation of mass |
In a chemical reaction the total mass of the reactants is always equal to the total mass of the products |
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Endothermic |
The reaction needs energy |
Baking a cake needs heat (En for enter) |
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Exothermic |
The reaction gives off energy |
Burning a candle (Ex for exit) |
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Reaction rate |
The speed of a chemical reaction. there are four factors that can speed up or slow down a reaction 1. Temperature 2. Surface area 3. Concentration 4. Catalyst |
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Ionic compounds |
Compounds that are formed from combination of differently charged atoms |
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Molecular compounds |
Compounds that are formed from two nonmetal atoms |
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