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7H Atoms E Compounds
Key words
Term | Definition |
---|---|
Chemical reaction | A change where new substances are formed |
Physical reaction | A change where no new substances are formed |
Property | Description of a material |
Atom | Small unit of matter |
Compound | Two or more different atoms bonded together (ionic or covalent bond) |
Element | A certain type of atom |
Molecule | Two or more atoms bonded together in a covalent bond (sharing electrons) |
Formula unit | Two or more different atoms bonded together in an ionic bond (+ve and -ve) |
Periodic Table | The list of elements |
Pure | A single element or compound (not a mixture) |
Crust | The thin solid layer on the surface of the Earth |
Recycle | Reprocess a material to make a new object |
Brittle | Does not bend but breaks |
Conductor of heat | Allows heat to pass through |
Conductor of electricity | Allows electrons to pass through |
Flexible | Can bend without breaking |
Malleable | Can be beaten and bend into shape |
Ductile | Can be drawn into a wire |
Magnetic | Attracted to a magnet |
Metal | Lose electrons to obtain a full outer shell |
Non-metal | Gain electrons to obtain a full outer shell |
Bond | A force that joins atoms together |
Metal ore | Rocks that contain metal compounds |
Oxide | Chemical bonded to oxygen |
Carbonate | Chemical bonded to CO32- |
Decompose | Break down to simpler substances |
Products | Substances formed in a chemical reaction |
Reactants | Substances used in a chemical reaction |
Thermal decomposition | Break down into simpler substances by heat |
Word equations | A chemical equation with words only and no chemical symbols |