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# Unit 1 - In The Lab

### Vocabulary

TermDefinition
Scientific Method a method of research in which a problem is identified, relevant data are gathered, a hypothesis is formulated from these data, and the hypothesis is empirically tested
Hypothesis a possible explanation for a set of observations or answer to a scientific question; must be testable
Experiment a test, trial, or tentative procedure; an act or operation for the purpose of discovering something unknown or of testing a principle, supposition, etc.:
Dependent Variable the factor that changes as a result of changes to the independent variable in an experiment; also called responding variable
Independent Variable the one factor that a scientist changes during an experiment; also called manipulated variable
Constant not changing or varying; uniform; regular; invariable
Control a person, group, event, etc., that is used as a constant and unchanging standard of comparison in scientific experimentation
Bias a subjective belief that affects a person’s attitude toward something; an error in the design of an experiment that affects the results of the experiment
Source of error cause the results of a research study to interpreted incorrectly. Human Errors when the researcher simply makes a mistake Systematic Errors caused by the way the experiment was conducted or the
Theory proposed explanation whose status is still conjectural and subject to experimentation
Scientific Law a statement based on repeated experimental observations that describes some aspect of the universe
Model a representation of a complex object or process, used to help people understand a concept that they cannot observe directly
Standard a reference that is used to calibrate measurements
SI International System of Units – the metric system
Volume The amount of space something occupies
Mass a measure of how much matter is in an object
Density measure of how much mass of a substance is contained in a given volume d = m/v
Deci- prefix meaning one tenth. 0.1
Centi - prefix meaning one hundredth 0.01
Milli - prefix meaning one thousandth 0.001
Micro - (Greek letter μ) prefix meaning “one millionth”
Nano - in the names of units of measure it has the specific sense “one billionth”
Kilo – prefix meaning “thousand”
Created by: ameissner

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