Light spectra - PowerPoint PPT Presentation

Lavoisier

Lavoisier. Law of conservation of mass Matter is neither created or destroyed during ordinary chemical reactions. . Proust. Law of Definite Proportions A chemical compound contains the same elements in the same proportions regardless of size of the sample or source of the compound .

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Early ASTRONOMERS

Early ASTRONOMERS. Aristotle. 384 BC- 322 BC Greek Philosopher Believed in a geocentric model of the universe Earth was the center and planets revolved around it Also believed in four basic elements- earth, fire, water, and air Though a 5 th element aether made up the celestial bodies.

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