Science Exam!

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Things I need to know:

Compounds formed from metals and non-metals consist of ions. Compounds formed from non-metals consist of mollecules.In mollecules the atoms are held together by covalent bonds. BASICALLY:   non-metal + non-metal = covalent bond

 metal + non-metal = ionic bond

Metals lose electrons to form positive ions. Non-metals gain electrons to form negative ions.

No atoms are lost or made during a chemical reaction, so the mass of products = the mass of reactants.

COPPER: Copper is easy to extract but copper-rich ores are becoming scarce so we are developing new methods of copper extraction. Copper can be extracted from copper-rich ores by heating the ores in a furnace (smelting). The copper can be purified by electrolysis. Copper is extracted from


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