Studied by 21 peopleScientific Method
A systematic approach and organized process used in scientific study to do research. It allows scientists to verify the works of others
Hypothesis
A tentative explanation for what has been observed in an experiment
Experiment
A set of controlled observations that test a hypothesis
Theory
An explanation of a natural phenomenon based on many observations and investigations
Scientific Law
A relationship in nature that is supported by many experiments
Independent Variable
The variable that you plan to change in an experiment
Dependent Variable
The variable that responds to the change in the independent variable
Scientific Notation
Expressing any number as a number between 1 and 10 multiplied by 10 raised to a power
Significant Figures
All known digits plus one estimated digit
Accuracy
How close a measured value is to an accepted value
Precision
refers to how close a series of measurements are to one another
Certainty
All numbers that are known
Unit Analysis
Proportional reasoning where a given measurement can be multiplied by a known proportion to give a result with a different unit or dimension
Conversion Factor
A ratio of equivalent values having different units
Law of Definite Proportions
A compound is always composed of the same elements in the same proportion by mass, no matter how large or small the sample is
Density
A ratio that compares the mass of an object to its volume
Substance
A matter that has a definite and uniform composition (also known as a chemical)
Matter
Anything that has mass and takes up space
Element
A pure substance that cannot be separated into simpler substances by physical or chemical means
Compound
A substance made up of two or more different chemical elements combined in a fixed ratio
Physical Property
A characteristic that can be observed/measured without changing the sample’s composition
Extensive Property
A characteristic that is dependent on the amount of a substance present
Intensive Property
A characteristic that is independent of the amount of a substance present
Chemical Property
The ability of a substance to combine with or change into one or more substances
States of Matter
The classification of all matter that exists naturally
Solid
A form of matter that has its own definite shape and volume
Liquid
A form of matter that flows, ahs constant volume, and takes the shape of its container
Gas
A form of matter that not only flows to conform to the shape of its container but also fills the entire volume of its container
Vapor →The gaseous state of a substance that is a solid or liquid at room temperature
Physical Change
A change that alters a substance without changing its composition
Chemical Change
A process that involves one or more substances changing into new substances
Law of Conservation of Mass
Mass is neither created nor destroyed during a chemical reaction (it is conserved)
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