Studied by 0 people
Matter
Anything that has mass and takes up volume.
Composition
What something is made of.
Structure
How the components of a substance are arranged.
Atom
The fundamental unit of matter.
Element
A pure substance made of only one type of atom.
Compound
A substance composed of more than one element, bound in fixed ratios.
Molecule
Groups of atoms that bind tightly together and behave as a single unit.
Mixtures
Contain more than one substance, not bound in a fixed ratio.
Homogeneous Mixtures
Components mix evenly.
Heterogeneous Mixtures
Components do not mix evenly.
Physical Properties
Can be measured without changing the identity of the substance (e.g., mass, volume, temperature, color, hardness).
Physical Changes
Changes that do not alter the identity of a substance.
Chemical Properties
Can NOT be measured without changing the identity of the substance.
Chemical Changes
Changes that alter the identity of a substance; also called chemical reactions.
Potential Energy
Energy that is stored.
Kinetic Energy
The energy of motion.
Exothermic Change
A change that releases heat energy.
Endothermic Change
A change that absorbs heat energy.
Scientific Method
A systematic process for investigating phenomena and acquiring new knowledge.
Hypothesis
A tentative explanation that has not been tested.
Theory
An idea supported by experimental evidence.
Scientific Law
A statement that describes observations that are true in widely varying circumstances.
Note 
Flashcard (31)