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32 Cards in this Set
- Front
- Back
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Matter |
Anything that has mass and takes up space |
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Substances |
Matter with a composition that is always the same |
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Elements |
Consists of just one type of atom |
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Compounds |
Two or more types of atoms bonded together |
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Mixtures |
Matter that can vary in composition |
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Heterogeneous |
Two or more substances unevenly mixed |
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Homogeneous |
Two or more substances evenly mixed |
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Density |
How tightly packed the atoms are |
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Protons |
Have a (+)charge |
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Neutrons |
Have a (=)charge |
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Electrons |
Have a (-)charge |
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Chemical bond |
Force that holds 2 atoms together |
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Molecule |
The smallest form of a compound |
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Endothermic reactions |
Energy is absorbed(you can often feel something becoming colder |
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Exothermic reactions |
Energy released (thermal/heat energy) |
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Gas production |
Bubble |
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Precipate |
A solid forms a solution during a chemical reaction |
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Color change |
Ex:leaves changing color in fall |
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Changing Oder/smell |
Ex:an apple stinks because it rotted |
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Chemical equation |
Uses symbol and # to represent a chemical reaction |
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Law of conservation of mass |
Total Mass of reactants must=total mass of products |
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Subscript |
Tells you how many atoms of that element there are |
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Coefficient |
Tell how many molecules of a compound they are |
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Energy |
The ability to do work or cause change |
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Work |
Is done when a force (push or pull)moves an object a distance |
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Potential |
Stored energy |
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Kinetic |
Energy of motion |
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Elastic potiental energy |
Ex rubber bands,springs |
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Gravitational potential energy |
Depends on the height of an object |
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Chemical energy |
Stored in the chemical bonds that hold atoms together |
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Law of conservation of energy |
Energy can not be destroyed or created,only transformed |
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Energy transformation |
Energy is transformed from one form into another |
