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Science Basics

Ch. 1 Nature of Science

QuestionAnswer
Hypothesis the predicted outcome of an experiment; the possible explanation or solution to a problem.
Independent (manipulated) Variable factors or conditions in an experiment that can be changed by the person performing the experiment; The condition you are testing for (color of light; type of soil, etc.)
Dependent (responding)Variable Conditions that change as a RESULT of a change in the independent variable (the DATA); Ex: height plants grew or number of tomatoes etc.
Control Group Group in the experiment that serves as a comparison. The control group is usually the "natural" condition (In an experiment to see if colored light affects plant growth, the control would be plants grown under natural light).
Model a description, representation, or imitation of an object, system, process or concept. Used to visualize things that are very big, small, or complex.
Scientific Theory a scientific explanation that is based on data, observations, and results from MANY, MANY experiments.
Scientific Method An organized plan for gathering, organizing, and communicating information.
Controlled Experiment Experiment in which only ONE variable (manipulated) is deliberately changed at a time. Responding variable is observed for changes. All other conditions are kept constant.
Constant Conditions All of the conditions that remain the same for all groups in the experiment.
In an experiment designed to determine how different salt concentrations effect the growth of corn plants, what would be the independent (manipulated variable)? The different salt concentrations the plants are grown in.
In an experiment designed to determine how different salt concentrations effect the growth of corn plants, what would be the dependent (responding variable)? The growth of the corn
In an experiment designed to determine how different salt concentrations effect the growth of corn plants, what would be the control group? The corn grown under normal or natural conditions (without any salt).
How many variables should an experimenter change or vary when setting up a controlled scientific experiment? One - only one condition should be changed; all others should remain the same.
Created by: burnsie