Karteikarten
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Karten in diesem Stapel (20)
- 1what is the definition of diffusion?diffusion is the random movement (or spreading) of particles from a place of high concentration to low concentration
- 2what is the process called when a solid goes to a gas?sublimation
- 3what is the difference between the melting and bling points of pure and impure substances?a pure substance has a precise melting/boiling point
an impure substance has a range of different boiling/melting points - 4how does an increase in temperature affect the solids solubility?as the temperature increases the solubility of a solid increases
- 5find out about how to tell if a mixture is saturated or unsaturated from a graphthe answer.
- 6another card on solubility graphsthe answer to the question
- 7what are three facts about the particles of solids?-there is a strong force of attraction
-they are fixed in a regular arrangement
-the hotter the solid becomes the more particles vibrate - 8question: describe the changes in arrangement, movement and energy of liquid ethanol particles when heated up to become a gas?-arrangement (spread apart)
-movement (fast and random)
-energy( increase in energy) - 9describe what happens to the particles in a solid when it is heated to the point of melting?-particles gain enough energy
-the overcome the attractive forces between them
-allowing them to move faster
-andn flow over eachother - 10what happens to the melting and boiling points when a substance contains an impuritythe melting point decreases and the boiling point increases
- 11what type of solid can be separated from a solvent by crystallizationa soluble solid
- 12what are the 4 steps of crystallization-heat the solution
-place on drop under a microscope slide to see if a crystal formes quickly
-the solution s left to cool and crystallize
-crystals removed by filtering, rinsed and dried in warm oven - 13what is the function of distillationto obtain a solvent from a solution
E.G to obtain water from salt water - 14how is distillation different to evaporationin distillation, you are able to capture a solid and pure solvent whereas in evaporation you can just capture a solid.
- 15where is fractional distillation importantit is important in the oil industry so you can separate crude oil into different parts of the oil
- 16what principle is fractional distillation based on?the different boiling points of the different fractions (parts) of the oil or mixture of liquids E.G water and ethanol
- 17where will the fractions with the lower boiling points condenselower boiling points go to the top(where it is cooler)
- 18what is chromatography for?to separate mixtures into there components. and to analyse, identify, purified and /or quantify to mixture or components
- 19what principle is chromatography based on?particle travel. some particles travel further than others
- 20how do you work out an RF valueRF=distance form the base line to the spot
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distance fromt he base line to the solvnet fornt
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- GCSE Chemistry-particle theorie Karteikarten am Ohne Titel, erstellt von Thea Ings-chambers am 03/11/2017.
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- Thea Ings-chambers
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