Chapter 2 Flashcards
Observation
is the use of the senses to obtain information by taking measurement and collecting data.
Qualitative
data that is descriptive
Quantitative
data that is numerical
Hypothesis
when scientists use generalizations about the data to formulate a testable statement
you make predictions
it is written as an “if-then” statement
System
is a specific portion of matter in a given region of space that has been selected for study during an experiment/observation.
EX. when observing a reaction in a test tube, the test tube and its contents is a system
Variable
any condition that changes
any change observed is due to a variable
Constant
the things in the experiment that stays the same for every group.
Control
the experimental support or conditions that remain constant
Independent variable
what you are looking at for changes; constantly changes(x-value)
Dependent variable
the outcome/result of the independent variable. (y-value) depends on the x-value
Theory
a broad generalization that explains a body of facts or phenomena
usually successful in predicting
EX. gravity theory
Model
In science, it is more than a physical object but an explanation of how phenomena occur and how data is related
Can be used verbally, visually, or mathematically
EX. atomic model of matter
Derived units
a measurement calculated by using 2 or more simple measurements
EX. volume, area, density, and speed
Accuracy
how close your measurements are to what you should have got
use percent error to check for accuracy
Precision
how close your measurements are to each other