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Chem Lab Final

Lab Terms

QuestionAnswer
Ensure that % errors are always reported as positive values absolute value bars
properties that do change the identity of substances under investigation chemical properties
the temperature at which a solid melts to a liquid melting point
a liquide substance is always producing some of the gaseous form of that substance boiling point
process by which a solid passes directly to the gaseous state without melting sublimation
physical combination of two or more pure substances mixture
either elements or compounds pure substances
the determination of the relative amounts of each component in the mixture quantitative
separation of a mixture is accomplished by exploiting the differences in the what physical properties
uses a solvent to selectively remove a component of the mixture that is soluble in the solvent chosen extraction
the degree of difficulty in raising the temperature of a material specific heat
tells us that if two substances at different temperature are in thermal contact, the amount of heat lost by the hotter material will be equal to the amount of heat gained by the cooler material conservation of energy
heat producing reactions exothermic
consume heat endothermic
the use of an insulated reaction vessel to prevent heat from escaping or entering the system under investigation calorimetry
salt that dissolves in water soluble
salt that does not dissolve in water insoluble
states that when a chemical reaction occurs, the total mass of products must be equal to the total mass of reactants law of conversation of mass
ionic compound with one or more water molecules incorporated into its structure hydrate
may be thought of as an hydrogen ion H+ acids
species such as HCL or HNO3 contain one H+ ion per molecule monoprotic
described as OH- bases
acids and bases react together neutralization reaction
water containing high levels of calcium and magnesium ions are hard water
if the liquids do not mix then two layers will form in the test tube immiscible
if only one layer is observed then the liquids mixed miscible
forced that exist between 2 or more molecules intermolecular forces
composed of a weak acid and its conjugate base present in equal amounts buffer solution
occurs without changing the chemical identity of a substance physical change
change from solid to liquid melting point
change from liquid to gas boiling point
Correctness Accuracy
Exactness Precision
To study heat transfer process Calorimetry
Amount of solute dissolved per amount of solution Concentration
Slow addition of 1 reactant to another until the stoichiometry of a reaction is realized Titration
Planning the shapes of molecules and ions VSEPR
Created by: Khuller