Chem Notes Essay

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Chemistry Notes Scientific method: observation, hypothesis, experiment, theory, and law. A theory is something that already has information backing it. Scientific or Natural laws: Conservation of matter: you can not create or destroy material. Such as during a reaction. Conservation of energy: energy is conserved and can not be destroyed. Rather it can change form. Conservation of matter and energy: all matter and energy is constant if you consider the entire universe. Nothing new is made or nothing new is destroyed. Einsteins theory of relativity: E=MC^2 Can describe the relationship between energy and mass. E is energy, M is mass and C is a constant. C is the speed of light. Huge amount of energy holds the atoms together. ConceptTest: C2H6 + 3O20 CO2 +CO+ 3H2O Which masses are equal? None of the answers would equal to each other. States of Matter: Solid, liquid, and gas. Tests: shape (rigidity, flow), compress/expand. Two views of matter are macroscopic and microscopic. We can see and feel the macroscopic, however we can not see the microscopic. In the class room we will use formulas to get a mental image of the micro. Matter can also undergo phase changes: solid to liquid to gas. ConceptTest: an example of a phase change called a deposition is: D. Frost on a windshield. Gas to liquid is condensation. Liquid to gas is evaporation. Gas to solid is deposition. Solid to liquid is sublimation. ConcepTest: which examples all require addition of heat? A. Evaporation, melting, and sublimation. Chemical and Physical Properties. * Chemical properties – chemical changes such as one molecule giving us a different molecule due to a reaction. * Physical properties – phase changes * Extensive properties – depend on mass or amount. Say the weight of a sample. * Intensive properties – do not depend on mass.

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