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SEC 1 SCIENCE, Separation techniques, Light, Cells, States of Matter,…
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Separation techniques
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Compounds and mixtures
Compounds: pure substances that are made up of two or more elements chemically combined in a fixed proportion by mass
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NEWater
Microfiltration, Reverse osmosis, Ultraviolet disinfection
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Definition of solubility: the amount of solute that can dissolve in a given amount of solvent at a given temperature
Light
Refraction
The bending of light as it passes from one transparent medium into another of a different optical density.
When a light ray is refracted, it bends toward the normal.
Reflection
angle of incidence: the angle between a incident ray on a surface and the line perpendicular to the normal.
Mirrors
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Concave
curving inward, image is magnified
Convex
curving outward, image is smaller than object.
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Cells
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Cell structure
Nucleus: Responsible for cell reproduction
Controls cell activities
Contains chromosomes
Usually the largest structure in an animal cell
Vacuole: Stores water and other nutrients needed for the organism to survive
Usually small, numerous and temporary in an animal cell
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Level of organization in the human body: cells, tissues, organs, organ systems
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