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Chem 111 Lab Final

Campbell University Chemistry 111

Accuracy the extent to which a given measurement agrees with the standard value for that measurement
Precision exactness; to arrive at an estimate with precision you can be precise but not accurate
Meniscus the convex or concave upper surface of a column of liquid, the curvature of which is caused by surface tension eye level
Volume by displacement for objects that are irregular shaped, using a graduated cylinder. Fill the cylinder up with water or so that it will at least cover the object. Take an initial reading, add the objects and take a final volume reading
"Best Straight Line" data set trend
Density mass/volume
Chemical Property displayed when a substance undergoes a chemical reaction to produce products
Physical Property color, state (solid, liquid or gas), density and melting and boiling points. the property of a substance without changing it
Solubility the amount of a substance that dissolves in a given volume of solvent at a given temperature
Malleability degree to which shaping is possible
Conductivity the ability of a solution to conduct electricity; this property indicates the pressure of ions
Electrolyte a material that dissolves in water to give a solution that conducts an electric current
pH a measure of the acidity or basicity of an aqueous solution
Starch Test adding two drops of iodine solution. if starch is present, a blue black color will develop
Hydrate a solid compound containing water molecules combined in a definite ratio as an integral part of a crystal
Dehydration a chemical reaction that involves the loss of water from the reacting molecule
Anhydrate a compound that can be considered as derived from another compound by subtracting the molecules of water
Crucible a refractory container used for metal, glass and pigment production
Precipitate a solid that forms out of solution. to separate (a substance) in solid form a solution, as by means of a reagent
Alum a crystalline solid, aluminum potassium sulfate, used in medicine as an astringency and styptic, in dying and tanning and in many technical processes
Filtration a method for separating the components of a mixture containing a solid and a liquid
Filtrate to filter; liquid that has been passed through a filter
Titration a technique in which one solution is used to analyze another
Indicator a chemical that changes color and is used to mark the end point of a titration
Endpoint of a Titration the point of the titration at which the indicator changes color
Neutralization Reaction an acid base reaction
Primary Standard are made from compounds that have a relatively high molar mass and are readily available at relatively low cost and high purity
Secondary Standard lack at least one of the criteria to make them primary standards
Titrant the solution which is delivered in incremental amounts from the burrette it can be an acid or a base
% (m/m) (mass of vitamin C in the tablet/ total mass of tablet) x 100%
Vitamin C ascorbic acid HC6H7O6
Basic a solution that contains excess OH-
Electromagnetic Radiation radiant energy that exhibits wavelike behavior and travels through space at the speed of light in a vacuum
Wavelength the distance between two consecutive peaks or troughs in a wave
Frequency the number of waves (cycles) per second that pass a given point in space
Photon a quantum of electromagnetic radiation
Planck's Constant the constant relating the change in energy for a system to the frequency of the electromagnetic radiation absorbed or emitted
Spectrophotometer device for measuring light
Created by: ptladycarmelo