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Chem Lab Final
| Term | Definition |
|---|---|
| Accuracy | Agreement of a particular value with the true value |
| Precision | Agreement among several measurements of the same quantity; reproducibility of a measurement |
| Meniscus | The curved upper surface of a liquid in a tube |
| Volume by displacement | A way to find the volume of an irregular shaped object Final Volume-Initial Volume=Displaced Volume |
| "Best Straight Line" | Linear relationship of mass and volume |
| Density | Amount of substance per unit volume Mass/Volume |
| Chemical Property | Displayed when a substance's identity changes |
| Physical Property | Things like color, state, density, mass, and melting/boiling points |
| Solubility | Ability of a substance that dissolves in a given volume of a solvent at a given temperature |
| Malleability | Capable of being altered or controlled by an outside source or influence |
| Electrolyte | Water soluble material that generates ions in water |
| pH | How acidic or basic a substance is |
| Starch Test | Test for the presence of starch in which the sample turns blue-black in color when potassium iodide is added. |
| Hydrate | Salts that contain water as a part of their structure |
| Dehydration | Two hydrogen atoms are removed from adjacent carbons of a saturated hydrocabon giving an unsaturated hydrocarbon |
| Anhydrate | The salt that is left after dehydration |
| Crucible | Ceramic container where metal or other substances can be melted or subjected to very high temperature |
| Precipitate | Solid formed in a solution |
| Alum | Special type of ionic compound referred to as a double salt. Used in the preparation of food products, tanning of leather and paper making |
| Filtration | A liquid that has been passed through a filter |
| Titration | Analytical technique where a reaction is carried out with a controlled addition of one reactant to another until both are consumed. |
| Indicator | Dye that changes colors depending on the composition of a solution into which it is placed. |
| Endpoint of Titration | Where the titration stops; Visualization of endpoint of reaction occurs by the indicator |
| Equivalence Point of Titration | When the number of moles of a base in the titrant will completely react with the number of moles in the acid. |
| Neutralization Reaction | Acid-Base Reaction |
| Primary Standard | Made from compounds that have a relatively high molar mass and are readily available at low cost and high purity |
| Secondary Standard | Lack at least one of the criteria to make them primary standards. |
| Titrant | Solution which is delivered in incremental amounts from the burette |
| % (m/m) | mass of vit C tablet/ total mass X 100% |
| Vitamin C | Ascorbic Acid; (HC6H7O6); needed for metabolic reactions in plants and animals. |
| Basic | Containing excess (OH-) |
| Photon | Particle of light |
| Cation | Positive Ion |
| Anion | Negative Ion |
| Filtrate | Liquid left after filtration |
Created by:
hhorwath
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