Vocabulary
- Dissolve – the process by which substances break down into small pieces and spread evenly in water
- Evaporation – to change from a liquid to a gas by adding heat
- Matter – anything that has mass and takes up space
- Mixture – a combination of two or more substances that can be separated in some physical way
- Physical properties – properties of matter that can be observed, measured, or changed without changing the matter itself
- Solution – a type of mixture in which the particles of one or more substances are dissolved (uniformly dispersed throughout) in another substance
Mixtures
- Mixture – a combination of two or more substances that can be separated in some physical way
- Mixtures do not form new substances
- Mixtures tend to keep most of their physical properties
- The ingredients in mixtures are usually able to be seen
- Mixtures can be separated physically
- Examples of mixtures:
- Rocks in sand
- Sand in water
- Iron filings and table salt
- Soil and rocks
- Pens / pencils / paper clips (student supplies)
- Contents of a recycling box
- Fruit salad
- Solution – a type of mixture in which the particles of one or more substances are dissolved (uniformly dispersed throughout) in another substance
- Ingredients of solutions may change their physical properties (e.g., sugar is a solid, but when mixed with water forms a solution that is liquid)
- Solutions are uniform (one cannot see the individual ingredients)
- Solids dissolve in liquid to form a solution
- Examples of solutions:
- Sugar in water
- Powdered drink mix in water, such as Kool-Aid™ or Crystal Light™
- Salad dressing (some varieties)
- Salt water
- Tea