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Dr. H LG02

Dr. Heiny: Learning Guide 02

Law A summary of observations.
Theory A unifying statement that explains a body of facts and the laws based on that body of facts. Theories may be rejected with the development of new instruments or experimental procedures. Theories are never proven.
Scientific method A systematic procedure for solving problems and exploring natural phenomena
Measurement Quantitative observations (measurements) usually involving the metric system.
Natural Law Same as a "Law" - clarifying that the summary of observations is focused on nature.
Dependent variable A variable that a scientist measures in an experiment and what is affected during the experiment. The dependent variable "depends" on the independent variable.
Hypothesis A proposed explanation of an observation that is tentative (temporary) and testable.
Independent variable A variable that the scientist manipulates in an experiment and what influences the dependent variable in the experiment.
Law of conservation of mass The mass in a closed system does not vary; mass cannot be created/destroyed, although it may be rearranged in space, and changed into different types of particles.
Model A physical, visual, or mathematical representation. Sometimes chemists use analogies (models) to help communicate a process or concept.
Qualitative data Observations that do not involve measurements or numbers, i.e., color, texture, size, shape
Quantitative data Observations involving numbers, for example, numbers from a Cent-O-gram balance (mass), a ruler (length), or graduated cylinder (volume).
Created by: LPH