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What is chemistry
“the study of matter and its properties, the changes that matter undergoes, and the energy associated with these changes”
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macroscopic
properties & behavior we can see (e.g., mass, volume, color, flammability)
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submicroscopic
properties & behavior we cannot see(e.g., atoms, molecules, chemical bonds)
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The scientific method
- Observations, Experiments, Analyses
- Patterns, Trends, and Laws
- Hypotheses
- Theories an Models
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Law
- Brief statement that puts together past observations and predicts future ones.
- The statement has always observed to be true.
- Therefore, generally accepted to be true in the future.
- e.g., Law of conservation of mass in chemical reactions
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Theory
- An explanation of a set of related observations or events.
- Broader deeper explanation for observations and laws
- Based upon hypotheses that are well-established from observations and experiments
- "Verified" continually by different scientists
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Measurement
- Units- metric, prefixes, and powers of ten
- Numbers- scientific notation
- Uncertainty- significant figures
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SI for mass?
kilogram (kg)
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SI for temperature?
kelvin (K)
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SI for amount of substance?
mole (mol)
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