Unit 1 Keywords Flashcards
accuracy
how close a measurement’s results come to the true value of what is being measure
atom
the smallest part of a substance that can be broken down chemically
chemical change
when an original substance is changed into a different substance (or substances) with different composition/properties
chemical property
the ability of a substance to react and change into a new substance
compound
pure substance that can be separated or decomposed into other pure substances, contains 2+ kinds of atoms
density
the relationship between the mass of a substance and how much space an object takes up (D=M/V)
exponent
number that indicates how many times a base number is multiplied by itself
gas
a substance or matter in a state in which it will expand freely to fill the whole container, having no fixed shape and not fixed volume
heterogenous mixture
mixture with non-uniform composition and appearance and distinct “parts”
homogenous mixture
mixture with uniform composition and appearance, a solution
hypothesis
tentative explanation of something observed
intensive property
property of matter that depends only on the type of matter in a sample, not the amount
law
generalization that summarizes experimental results
liquid
State of matter where particles take the shape of their container and have a fixed volume (flows freely)
mass
measurement of the amount of matter in something
matter
any substance that has mass and takes up space by having volume
mixture
Two or more substances mixed together but not chemically combined
molecule
Atoms bonded together with chemical bonds
physical change
A change in a substance that doesn’t change its chemical makeup
physical property
The ability of a substance to change without changing its chemical makeup
precision
how close multiple measurements of the same thing are to each other
pure substance
A form of matter that has a constant composition and properties that are constant throughout the sample
scientific method
A method of inquiry consisting of scientific observation, measurement and experimentation to objectively establish facts
significant digits
digits within a number that indicate the degree of certainty in a measured quantity
solid
A state of matter that has a fixed shape and volume and trapped particles
temperature
the measure of the relative amount of kinetic energy in atoms
theory
Explanation of why a scientific law exists
volume
How much space a substance takes up
