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Download Chemistry 1 H Chapter 1 Block 4 Notes.notebook
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Chemistry 1 H Chapter 1 Block 4 Notes.notebook February 03, 2017 Chapter 1 Matter and Energy Scientific Method: Steps to solve a problem or explain some natural phenomenon. 1. Identify the problem to be solved or make an observation to be explained. Gather some information, look for relationships between the data . Good Science Bad Science Aristotle: Earth Center of Universe 2. Hypothesis: A possible solution or explanation for the problem to be solved. A model used for testing. 3. Test the hypothesis using controlled experiments. Independant Variable: A variable that we manipulate. Controlled variables: Variables that do not change. Dependant variable: Variable that is a measured outcome of the experiment. 4. Make a conclusion: Choice 1: Reject the hypothesis. Go back to step 1 and start over. Choice 2: Accept the hypothesis. Develop scientific law or theory. What is the difference between a law and a theory? Scientific Law 1st law of thermo law of gravity law of gravity g 1st law of motion 1st law of motion n 1st law of motion Conservation of energy n 2nd law of motion conservation of matter conservation of energy Scientific Theory Evolution general relativity Big Bang Theory special relativity Relativity big bang Global Warming black holes string theory evolution global warming Scientific law: States the relationship between variables of a scientific experiment. Scientific theory: Explains how or why experiments give certain results. Nothing is proven in science! 5. Test of time: Other people review work and test it. Gradually theories and laws become accepted, modified, or rejected. 1 Chemistry 1 H Chapter 1 Block 4 Notes.notebook Mass constant measures amount of matter measures amount of inertia measured on a balance scale February 03, 2017 Weight varies with gravity measures the pull of gravity measured on a spring scale solid constant volume definite shape liquid constant volume shape of container gas volume of container shape of container particle motion: vibrate freedom freedom density: high high low 2 Chemistry 1 H Chapter 1 Block 4 Notes.notebook physical properties color melting point boiling point solubility density hardness texture February 03, 2017 chemical properties flammability reactivity Difference: Chemical properties deal with changes in the identity of substances. Physical properties do not. 3 Chemistry 1 H Chapter 1 Block 4 Notes.notebook physical changes melting any change of phase cutting breaking dissolving February 03, 2017 chemical changes burning rusting decomposing tarnishing growing Evidences of a chemical change: permanent color change heat given off flame light effervescence (bubbles in a solution) precipitate During chemical changes, atoms are rearranged with other atoms to form new compounds. Atoms are never created or destroyed in chemical reactions. 4 Chemistry 1 H Chapter 1 Block 4 Notes.notebook February 03, 2017 Physical Universe matter heterogeneous mixture energy kinetic homogeneous mixture potential substance compound element 5 Chemistry 1 H Chapter 1 Block 4 Notes.notebook compound (substance) elements lose identities when formed definite ratios by mass formed by chemical change seperated by chemical changes February 03, 2017 mixture elements retain identities any ratio by mass formed by physical change seperated by physical changes 6
