Observation- qualitative (senses) and quantitative (measurement) of the properties of an object or system
Interpretation (inference)- to understand, or explain the meaning of something
Classification- grouping items according to like characteristics (regularities)
Hypothesis- a temporary "explaination" for an observed regularity. Must be testable.
Theory- when a hypothesis has been tested many times leading to a high degree of confidence. A theory accounts for past events and accurately predicts future ones.
Model- a representation intended to convey information about another object or event
Chemistry- the branch of science concerned with properties, composition and behavior of matter
Matter- anything that has mass and occupies space
Potential Energy- the energy of "being" or "position"
Kinetic Energy- the energy of "motion"
Chemical changes- an irreversible change which produces a new substance (loss of original identity)
Physical changes- a reversible change without form
Distillation- boiling off and recovery of a liquid via condensation in order to separate solutions
electrolysis- separation of ionized compounds via passage of electric current
Macroscopic obervations- "sense" observations
Macroscopic properties- properties exhibited by a quantity of the matter
Ions- particles having an electric charge
Mole- the amount of a substance that contains 6.02x1023 particles.THis is also equivalent to the atomic weight of an element and the molecular weight of a compound. EX. 6.02x1023 atoms of carbon has a mass of 12.01 grams. 6.02x1023 molecules of water (H2O)has a mass of 18.01 grams
Molar mass- the number of grams necessary to have one mole of atoms or molecules of that compound
Exothermic- describing a chemical reaction in which energy is released to the surroundings
Endothermic- type of reaction in which more energy is absorbed to break bonds than is released to form new bonds
