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Dr. H LG02
Dr. Heiny: Learning Guide 02
Question | Answer |
---|---|
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). |