Chemistry Ch 2
Terms
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- Hypothesis
- testable statement
- Model
- an explanation of how phenomena occur and how data or events are related
- Scientific Method
- a logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data
- SI
- system of international units
- Quantitative
- numerical data
- Accuracy
- the closeness of measurements to the correct or accepted value of the quantity measured
- Conversion factor
- a ration derived from the equality between two different units that can be used to convert from one unit to the other
- Observation
- the use of senses to obtain information
- Quantity
- something that has magnitude, size, amount
- Qualitative
- descriptive data
- Weight
- a measure of the gravitational pull on matter
- System
- a specific portion of matter in a given region of space that has been selected for study during an experiment or observation
- Precision
- the closeness of a set of measurements of the same quality made in the same way
- Percent Error
- PE = value accepted - value experimental / value accepted x 100
- Significant Figures
- consist of all digits known with certainty plus one final digit, which is somewhat uncertain or is estimate
- Scientific Notation
- numbers are written in the form A x 10^b where A is a number > 0 but less than 10 and b is a whole number
- Density
- the ratio of mass to volume, or mass divided by volume
- Derived SI
- combination of SI units
- Theory
- a broad generalization that explains a body of facts or phenomena