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Definitions CH 6

Exam 3

Physical change the chemical composition of the substance is the same. Ex melting ice, boiling water
Chemical change the chemical composition of the substance changes. There is a chemical reaction that makes a new substance
Chemical compounds of fireworks (ions or ionic compounds) Na (orange-yellow), Ba (green-yellow), Ca (red-orange), Sr (bright red), Li (scarlet red), Cu (blue-green), Al & Mg (white sparks)
Four observations of a chemical reaction Gas release (fizzing or bubbling) Insoluble solid (ppt)that forms from 2 aq sol Permanent color change (new substance) Heat energy change (Ex. heat and light )
Aqueous solution Substance dissolved in water
Precipitate (ppt) insoluble solid formed after adding 2 aqueous solutions together
Exothermic reaction Reaction that releases heat
Endothermic reaction Reaction that absorbs heat
Chemical equation description of a chemical reaction using formulas and symbols
Reactants A + B -
Products - C + D
Catalyst Speeds up the reaction without being comsumed (above the arrow)
7 Diatomic Molecules H, Ni, O F, Cl, Br, I
Balance chemical equation the number of atoms of each element is the same on both sides of the arrow
Coefficient Whole # in front of each substance used to balance chemical reactions.
Created by: lesliemelissa19



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