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Chem 111 Lab Final
Campbell University Chemistry 111
| Question | Answer |
|---|---|
| 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
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