Shared Flashcard Set

Details

Physical Science Lesson 2
Vocab
35
Science
8th Grade
09/14/2011

Additional Science Flashcards

 


 

Cards

Term
matter
Definition
anything that occupies space and has mass
Term
particle theory
Definition
the concept that all matter is made of exceedingly small particles
Term
atom
Definition
The basic particle of matter from which all other matter is constructed. It consists of protons, neutrons, and electrons.
Term
bond
Definition
A connection that atoms make with each other by sharing of transferring electrons and (usually) neutrons.
Term
diffusion
Definition
the process of spreading out and mixing due to particle motion
Term
Brownian Motion
Definition
The microscopic, random jostling of suspended matter due to the collisions of innumerable gas or liquid particles in which the matter is suspended.
Term
nucleus
Definition
the center of and atom. it contains protons and usually neutrons, which make up nearly all the mass of the atom
Term
proton
Definition
a nuclear particle, or nucleon, that carries a single possitive fundamental charge. its mass is about 1863 time that of a electron's. the number of protons in an atom determines its identity as an element.
Term
neutron
Definition
a neutral nuclear particle, or nucleon. it has about the same mass as a proton, and its purpose seems to be stabilize the nucleus.
Term
electron
Definition
a particle with unusual properties that carries a single negative fundamental charge.
Term
molecule
Definition
distinct particles formed when who of more atoms bond together
Term
ion
Definition
an atom or molecule that has gained or lost electrons, thus producing an imbalance between the number of protons and electrons in the particle.
Term
pure substance
Definition
a substance that contains only a single element or compound
Term
element
Definition
a pure substance that contains only one kind of atom.
Term
compound
Definition
a pure substance consisting of atoms of two or more elements bonded together in a fixed ratio.
Term
mixture
Definition
a non chemical
Term
state
Definition
a physical form of matter determined by the arrangement and energy of its particles. the three most common state of matter are solid, liquid, and gas.
Term
solid
Definition
the state of a substance in which its particles occupy fixed positions. a solid id rigid, or nearly so, and has a definite volume and shape &and low compressibility.
Term
liquid
Definition
the state of a substance in which its particles are close together, but mobile. a liquid has a definite volume but no fixed shape. it has low compressibility, can flow, and has a free surface.
Term
gas
Definition
the substance in which its particles are far apart and have large kinetic energies. a gas has no fixed volume or shape, is highly compressible, and is able to flow.
Term
fluid
Definition
a substance that can flow; a liquid or gas.
Term
gas pressure
Definition
the pressure a gas exerts on it container or on an object immersed in it.
Term
physical property
Definition
any feature of matter that can be observed or measured without altering the kind of matter being studied
Term
physical change
Definition
any change that does not alter the composition of a substance
Term
chemical property
Definition
a feature of a substance that describes how its chemical identity changes in the presence of another substance or under certain conditions.
Term
chemical change
Definition
any change in a substance that alters its compositions (the kind and ration of elements in the substance)
Term
melting
Definition
the change of state from a solid to a liquid when thermal energy is absorbed.
Term
melting point
Definition
the temp @ which a pure solid is turned in a liquid at 1atm; the same temp as the freezing point.
Term
freezing
Definition
the change of state from a liquid to a solid when thermal energy is released.
Term
freezing point
Definition
the temp @ which freezing occurs t 1 atm; the same as the melting point.
Term
vaporization
Definition
any process in which particles of a liquid enter the gaseous phase
Term
boiling point
Definition
the temp and pressure @ which boiling occurs
Term
evaporation
Definition
relatively slow vaporization that occur when a liquid's temp is below its boiling point but above its freezing point. _______________ occurs only @ the surface of the liquid.
Term
sublimation
Definition
the change of state from a solid directly a vapor (or vice versa) @ temps below the melting point of the substance
Term
condensation
Definition
the change if stat from gas to liquid when thermal energy is released to the surroundings.
Supporting users have an ad free experience!