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Ch. 1-3,9 Vocabulary


Radioactive An unstable isotope that spontaneously emits energy to become more stable.
Condensation Particles of a vapor striking the liquid surface and returning to the liquid phase.
Nuclear fusion Small nuclei combine to form a larger nucleus.
Electron Charge is negative
Proton Charge is positive
Neutron Charge is neutral
Kinetic energy Energy of motion
Potential energy Stored energy
Meter Standard metric unit for length measurements.
Liter Standard metric unit for volume.
Gram Standard metric unit for weight.
Precision Reproducible or repeatedly obtain measurements with values close together.
Exact numbers Numbers obtained from counting or from definitions comparing two units in the same system of meaurements.
Rem Represents the measure of biological effect or biological damage done by different kinds of radiation.
Protons and neutrons Subatomic particles located in the nucleus of an atom.
Half-life The length of time for half of a radioactive sample to decay.
Hypothesis A tentative "guess" to explain an observation that can be tested.
Beta Type of emission when an unstable nucleus converts a neutron to a proton and emits an electron from the nucleus.
Calories Heat that is a form of energy - the appropriate reporting unit for the amount/quantity of heat.
Atom Smallest particle of an element
Physical properties Shape, color, state of matter, melting point and density.
Physical changes Changes in matter
Chemical changes An irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance. Ex: rust on metal
Volume The amount of space an object occupies.
Mass The weight of an object.
Density The state or quality of being dense; compactness
Matter Anything that occupies space and has mass.
Created by: daydreamer67