UNIT 1: General, Organic, and Biological Chemistry

Accuracy - How close a measured value is to a true value Accuracy vs Precision - Accurate: how close a measure value is to the true value Precise: a measure of reproducibility Amount of energy to change phases of matter - *It takes same amount of energy to go from solid to liquid as it does to go from liquid to gas *the amount of energy from gas to solid = the the combined amount of energy of solid to liquid and liquid to gas Biochemistry - a study of the chemistry of livings things Calculations with significant figures: addition and subtraction - The last "common" digit is the last s.f. 7.14 - 3.2 = 3.9 7.14 + 3.2 = 1.0 x 10¹ Calculations with significant figures: multiplication and division - The number with the fewest s.f. determines s.f. of the final answer 3.2 x 7.14 = 23 3.2 ÷ 7.14 = 0.45 Celsius scale - Water melts: 0°C Water boils: 100°C Chemical changes in matter - DOES change the composition of matter *Change in temperature (and a chemical reaction occurs, not just a change of state like water becoming ice or vapor) *Change in color (some chemical reaction has occurred) *Formation of a precipitate (a solution separates) *Formation of bubbles (a gas is being formed) Chemistry - The branch of science involved in the study of matter and its changes Conversion Factors - A ratio that relates two different units Density - The amount of mass contained in a given volum