Chapter 1: Introduction to Chemistry

Chemistry
The study of matter and the changes that it undergoes.
Substance
Matter that has a definite and uniform composition.
Mass
Measurement that reflects the amount of matter.
Weight
Measure not only of the amount of matter but also of the effect of Earth’s gravitational pull on that matter.
Model
Visual,verbal, or mathematical explanation of experimental data.
Scientific Method
Systematic approach used in scientific study.
Qualitative Data
Information that describes color, odor, shape, or some other physical characteristic.
Quantitative Data
Numerical information.
Hypothesis
Tentative explanation for what has been observed.
Experiment
Set of controlled observations that test the hypothesis.
Independent Variable
Variable that is planned to change.
Dependent Variable
Changes in response to the independent variable.
Control
Standard for comparison.
Conclusion
Judgement based on information obtained.
Theory
Explanation of a natural phenomenon based on many observations and investigations over time.
Scientific Law
A relationship in nature that is supported by many experiments.
Pure Research
Used to gain knowledge for the sake of knowledge itself.
Applied Research
Research undertaken to solve a specific problem.
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