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Description
Flashcards by alicia skinner, updated more than 1 year ago
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Created by alicia skinner
almost 8 years ago
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| Question | Answer |
| Chemistry - disstulation | Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture. |
| Solvents | A solvent (from the Latin solvō, "I loosen, untie, I solve") is a substance that dissolves a solute (a chemically different liquid, solid or gas), resulting in a solution. A solvent is usually a liquid but can also be a solid or a gas. |
| Solutes | The salt is the solute and the water the solvent. In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. |
| Solution | In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. |
| Using measuring cylinders | Always leave the measuring cylinder on a flat surface when you are reading the volume of the liquid it contains. You should move your body downwards so that your eye is on the same horizontal line as the surface of the liquid. DO NOT lift the measuring cylinder to measure the volume of the liquid contained in it! |
| Distillation of air | Fractional distillation of liquid air. You need to be able to explain how nitrogen and oxygen are obtained from the air. You will recall that about 78% of the air is nitrogen and 21% is oxygen. These two gases can be separated by fractional distillation of liquid air. |
| Chromatography | Chromatography is used to separate mixtures of substances into their components. All forms of chromatography work on the same principle. They all have a stationary phase (a solid, or a liquid supported on a solid) and a mobile phase (a liquid or a gas) |
| Physical change | Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds |
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