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SOLUTIONS. ACTIVATOR---KWL CHART. Solutions. Are homogeneous mixtures (look the same throughout) Are PHYSICALLY combined See p. 401. 2 Parts of a Solution:. solute. solvent. Substance being dissolved Usually present in the least amount Ex: salt. - PowerPoint PPT Presentation
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SOLUTIONS
ACTIVATOR---KWL CHARTWHAT DO I KNOW ABOUT SOLUTIONS?
WHAT DO I WANT TO KNOW ABOUT SOLUTIONS?
WHAT HAVE I LEARNED TODAY ABOUT SOLUTIONS?
SOLUTIONSAre homogeneous mixtures (look the same throughout)
Are PHYSICALLY combinedSee p. 401
2 PARTS OF A SOLUTION:
Substance being dissolved
Usually present in the least amount
Ex: salt
Substance that is dissolving something else
Present in most amount
Ex: water (“universal solvent”)
solute solvent
More solute than solvent
More solvent than solute
CONCENTRATED DILUTE
THE DISSOLVING RULE: “LIKE DISSOLVES LIKE”Water is a polar molecule:
Polar solutes dissolve well in polar solventsEx: salt waterNonpolar solutes dissolve well in nonpolar
solvents
SEE P. 406
Solutions that conduct electricity
Ex: salt water
Solutions that do not conduct electricity
Ex: sugar water
Electrolytes Nonelectrolytes
Do not dissolve well in each other
Ex: water & oil, oil & vinegar
Dissolve well in each other
Ex: water & sprite
IMMISCIBLE miscible
WAYS TO INCREASE DISSOLVING RATE Stir Powder/crush up the solute (this increases its
surface area) Increase pressure (this is Henry’s Law—if
pressure increases, solubility increases) Increase heat (this is NOT true for gases
dissolved in liquids) see p. 414 top graph
EQUILIBRIUM When 2 opposing changes take place at the
same time at the same rate Ex: unopened coke can (see p. 408)
WHAT HAPPENS WHEN YOU OPEN THE COKE CAN????? Effervescence----the rapid escape of a gas
from its solution Le Chatlier’s principle---when a system is
stressed, a new equilibrium will be reached at new conditions
(coke can will become flat when left opened)
ALLOYS Solutions of metals Created to increase strength and to resist
corrosion Ex: brass, bronze, sterling silver, pewter,
stainless steel, gold jewelry
SOLUBILITY—HOW MUCH SOLUTE WILL DISSOLVE IN A CERTAIN AMOUNT OF SOLVENT AT A GIVEN TEMP & PRESSURE See p. 414 solubility curves SATURATED—has max. amt. of solute
---is a point on the lineUNSATURATED—has less than the max. solute
--is a point below the lineSUPERSATURATED—has over the max. solute
----is a point above the line---temp & pressure have to
be raised
TERMS SHEET 1---3, 5---14, 24---25 (NOTES)
Define: 4, 15---23
ACTIVATOR—WORD SPLASHList as many words or phrases that come to mind when you hear the word “solutions”.