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Vocabulary words 20-40
Study for vocabulary tests
20
Science
7th Grade
08/17/2011

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Term
Mass
Definition
Amount of matter in an object
Term
Compound
Definition
Atoms of more than one type of element chemically combined
Term
Atom
Definition
Building block of matter
Term
Nucleus
Definition
Positively charged part of an atom that contains the protons and neutrons
Term
Molecule
Definition
Two or more atoms held together by an attractive force
Term
Conduction
Definition
Transfer of heat by molecules bumping into one another
Term
Convection
Definition
Transfer of energy through the flow of material; heating, rising, and cooling, sinking of material
Term
Radiation
Definition
Transfer of energy through waves
Term
Mixture
Definition
Two or more substances NOT chemically combined
Term
Physical property
Definition
Characteristic you can see without changing the composition of a substance
Term
Chemical property
Definition
Characteristic that can only be seen by altering the substance
Term
Physical change
Definition
Form or appearance changes but not the composition
Term
Chemical change
Definition
Substance is changed into a different substance by a chemical reaction
Term
Denstity
Definition
Amount of mass in a given space; density=mass/volume
Term
Solubility
Definition
Amount of a substance that will dissolve in an amount of another substance at a given temperature
Term
Climate
Definition
An areas averaged weather conditions over time
Term
Evaporation
Definition
When a liquid turns into a gas
Term
Condensation
Definition
When a gas turns into a liquid
Term
Precipitation
Definition
Water falling from clouds
Term
Abiotic factor
Definition
Non living physical features of an environment including water, air, and temperature
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