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7 Mixtures
Mixtures and Separation
Term | Definition |
---|---|
liquid | One of the states of matter. Has a fixed volume but not a fixed shape. |
solid | One of the states of matter. Has a fixed shape and fixed volume. |
gas | One of the states of matter. Does not have a fixed shape or a fixed volume and is easy to squash. |
dissolve | When a substance breaks up into such tiny pieces in a liquid that it can no longer be seen and forms a solution. |
method | A description of how an experiment is carried out, written in simple, well-organised steps. |
sequence | Step-by-step in the correct order, such as the steps in a method for an experiment. |
imperative verb | A command to do something. |
filtrate | The liquid that passes through a filter. |
mixture | Two or more substances jumbled together but not joined to each other. |
suspension | A mixture of a solid and liquid, where the solid bits are heavy enough to settle out if the mixture is left to stand. |
colloid | A mixture of a solid, liquid or gas in a solid, liquid or gas, where the substances do not settle out if left to stand. |
disperse | To spread without settling out, such as the bits in a colloid. |
opaque | Not possible to see through. |
solution | When a substance has dissolved in a liquid. Solutions are transparent. |
transparent | Clear, can be seen through. |
filter | Anything, such as cloth, paper or a layer of sand, through which a liquid is passed to removesuspended pieces of solid. |
to filter | To separate solid substances that have not dissolved from a mixture containing solids and liquid. |
sieve | A mesh or grid with holes that holds back large solids from a mixture but allows smaller solid pieces and liquids through. |
to sieve | To separate large solids from a mixture using a sieve. |
solvent | The liquid in which a substance dissolves to make a solution. |
solute | The substance that has dissolved in a liquid to make a solution. |
soluble | Describes a substance that can dissolve in a liquid. |
insoluble | Describes a substance that cannot dissolve in a liquid. |
saturated | A solution that contains so much dissolved solute that no more solute can dissolve in it. |
solubility | The amount of substance that dissolves in a particular solvent at a particular temperature to make a saturated solution. |
heating to dryness | Evaporating the liquid from a solution to leave the solids that had been dissolved in it |
evaporate | To change from the liquid state to the gas state. |
hazard | A danger, or something that can harm. |
risk | The likelihood that a hazard may cause harm. |
evaporation | When a substance changes from its liquid state to its gas state, for example when the gas escapes from the surface of the liquid into the air. |
sodium chloride | The chemical name for table salt. |
boiling | When there is liquid turning into a gas in all parts of a liquid, creating bubbles of gas in the liquid. |
boiling point | The temperature at which a liquid boils. |
chromatography | A method that separates out dissolved substances in a mixture, using a liquid or gas solvent. T |
paper chromatography | Chromatography where the solvent moves through paper, carrying the dissolved solids. |
chromatogram | The results of chromatography (e.g. a dried piece of paper for paper chromatography), when the dissolved solids have been separated. |
desalination | To produce fresh drinking water by separating the water from the salts in salty water. |
distillation | The process of separating a liquid from a mixture by evaporating the liquid and then condensing it (so that it can be collected). |
steam | Water as a gas. May also be called water vapour. |
condense | When a substance changes from its gas state to its liquid state. |
still | Apparatus that can be used for distillation. |