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Science 7 Unit 5
Use this Study Stack to help review the terms of Science 7 Unit 5!
| Term | Definition |
|---|---|
| Mixtures | Two or more substances that are in the same place but are not chemically combined |
| Homogeneous | A mixture that is the same throughout (uniform/ evenly mixed) ex: Sugar water |
| Heterogeneous | A mixture that is different throughout (random/ unevenly mixed) ex: raisin water |
| Filtration | the process in which large particles in a liquid or gaseous fluid are removed by the use of a filter. Ex: Sand and water - the sand gets trapped in the filter paper while the water passes through. |
| Magnetism | is a force that can attract or repel certain materials. Objects made of iron, nickel, cobalt, or steel are attracted to magnets. Iron fillings and sand- the sand gets trapped in the filter paper while the water passes through. |
| Evaporation | the process where a liquid changes into a gas. This process can be used to separate mixtures because the liquid evaporates, leaving the solid behind. Ex: Sugar Water- when the water evaporates, sugar crystals remain. |
| Sieving | a method used to separate mixtures based on the size of the particles. A sieve has small holes that allow smaller particles to pass through while larger particles stay on top. Sand and pebbles- the sand falls through the sieve; the pebbles stay behind. |
| solution | a type of mixture that has the same properties (homogeneous) throughout and the particles are to small to see. (dissolved) |
| solute | is present in smaller amounts, gets dissolved Example: salt |
| solvent | is the present in larger amounts, does the dissolving Example: water |
| colloid | a type of mixture with small, undissolved particles that will not settle ex: milk, gelatin, fog |
| suspension | a type of mixture with the particles that can be seen easily and will settle over time or can be filtered (They will show the Tyndall Effect) |
| Tyndall Effect | The particles are too small to be seen but can be scattered by a light beam. This is known as the Tyndall Effect. |
| dilute solution | a mixture that has only a small amount of solute dissolved in a certain amount of solvent |
| concentrated solution | a mixture that has a larger amount of solute dissolved in the solvent |
| solubility | The measure of how much solute can dissolve at a give temperature |
| Saturated solution | is when NO MORE SOLUTE can be dissolved in a solvent (this is the perfect amount of solute dissolved in the solvent) |
| Unsaturated solution | when MORE SOLUTE can be dissolved in a solvent |
| Supersaturated solution | a solution containing MORE SOLUTE THEN IS POSSIBLE to dissolve (usually caused by super heating the solvent.) |
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