Review Sheet for POST TEST. 1. What is the difference between an element and a compound?.
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An element is a “pure” form of matter; examples include Hydrogen (H), Sodium (Na), Copper (Cu), and everything else on the periodic table.Compounds are combinations of elements; 2 or more elements; Examples include Water (H2O), Salt (NaCl), and Nitric Acid (HNO3)
- if something is burned, gas is given off (causing a loss in mass, Ex. CO2)- if some new material is formed then gas can be added (causing a gain in mass, Ex. O2)
If something exceeds its limit (the amount it can bend) then it will break. (Example, two plates come together and the rocks continue to bend until it reaches its limit and breaks causing an earthquake)