Flashcards
FLASHCARDS
Cards in this deck (5)
- 1—SIEVING:
Most of the things that we come across in our day-to-day life exist as a mixture of two or more pure substances. We need to separate these pure substances from the mixture in order to use them individually. sieve plates allow the fine flour particles to pass through the holes of the sieve plate while the bigger impurities are unable to pass through it and remain on the sieve. This method is useful because it separates substances but the texture and size has to be different. For example, flour and chalk cannot be separated. - 2—EVAPORATION:
Is a technique used to separate homogeneous mixtures where there is one or more dissolved salts. This drives off the liquid components from the solid components. This process involves heating the mixture until no more liquid is remaining. For example, salt and water.
- 3—DISTILLATION:
Is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. The mixture is heated and the most volatile component vaporizes at the lowest temperature. Then the vapor passes through a condenser where it condenses back.
- 4—DECANTATION:
Decantation is the process of separation of liquid from solid and other immiscible (non-mixing) liquids, by removing the liquid layer at the top from the layer of solid or liquid below. The process can be carried out by tilting the mixture after pouring out the top layer. This process can also be used to separate two liquids that do not mix with each other for e.g., oil and water.
- 5—CRYSTALLIZATION:
Crystallization is a technique used for the purification of substances. A separation technique to separate solids from a solution.
When a substance is subjected to crystallization, its atoms or molecules bind together through well-defined angles.
On adding a solid substance in a liquid and stirring it, the solid dissolves in the fluid. But when added more and more solid to the liquid, a point comes after which no more solid dissolves in the liquid. This point is called a saturation point and the fluid is called a saturation solution.
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- Física y Química Flashcards on FLASHCARDS, created by Osuna Royer Alejandra on 10/07/2020.
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- Osuna Royer Alejandra
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