Essential Techniques for Separating Mixtures and Matter Properties
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Techniques for Separating Mixtures
- Decanting: Used to separate insoluble liquids with different densities.
- Filtration: Separates solids from liquids by passing the mixture through filter paper in a funnel.
- Magnetic Separation: Utilizes magnetic properties to isolate substances like iron from non-magnetic materials.
- Screening: Separates powdered solids of different grain sizes using sieves.
- Crystallization and Precipitation: Used to separate a solid solute dissolved in a solvent. As the liquid evaporates, the solid forms crystals or a powder called a precipitate.
- Distillation: Used to separate and recover two or more liquids soluble in each other, such as alcohol and water.
Understanding Matter and Its Properties
Matter is anything that has mass and occupies space (volume).
Physical Properties
Properties that allow us to distinguish between substances are categorized as intensive or extensive.
Fundamental and Derived Quantities
Some quantities, such as length, mass, and time, are determined by direct measurement and are called fundamental magnitudes. Those expressed by the mathematical combination of fundamental quantities are derived quantities.
Major Fundamental Quantities
| Magnitude | Length | Mass | Time | Temperature |
|---|---|---|---|---|
| Unit | Meter | Kilogram | Second | Kelvin |
| Symbol | m | kg | s | K |
Measuring Length
Length is the distance between two points and is a fundamental magnitude. The standard unit in the International System is the meter (m).
Metric Multiples and Submultiples
| Unit and Symbol | Equivalence in Meters |
|---|---|
| Kilometer (km) | 1000 m |
| Hectometer (hm) | 100 m |
| Decameter (dam) | 10 m |
| Meter (m) | 1 m |
| Decimeter (dm) | 0.1 m |
| Centimeter (cm) | 0.01 m |
| Millimeter (mm) | 0.001 m |
| Micrometer (µm) | 0.000 001 m |
Surface Area Measurements
Surface area expresses the extension of a body in two dimensions: length and width. It is a derived quantity with the square meter (m²) as its SI unit.
Calculating Surface Area
- Regular shaped objects: Use the specific mathematical equation for the shape. For example: Area = (base × height) / 2.
- Circular objects: Calculated by multiplying pi (π) by the radius squared: Surface = π × r².