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Matter and It's States
Key Terms for Physical Science Term 1 Unit 2
27
Science
9th Grade
04/08/2020

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Term
Distinguish
Definition
perceive and point out a difference
Term
Molecules
Definition
the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
Term
Mixture
Definition
a combination of two or more substances that are not chemically combined
Term
Pure Substance
Definition
a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
Term
Homogeneous Mixture
Definition
the substances are not mixed uniformly and are not evenly distributed
Term
Heterogeneous Mixture
Definition
the components are evenly distributed, and the mixture is the same throughout
Term
Melting Point
Definition
the temperature and pressure at which a solid becomes a liquid
Term
Density
Definition
a measurement of how much matter is contained in a certain volume of a substance - Density = Mass/Volume
Term
Boiling Point
Definition
the temperature and pressure at which a liquid becomes a gas
Term
Reactivity
Definition
the ability of a substance to combine chemically with another substance
Term
Suspension
Definition
a mixture in which particles of a material are more or less evenly dispersed throughout a liquid or gas
Term
Colloid
Definition
a mixture consisting of tiny particles that are too small to settle out or be filtered out
Term
Solution
Definition
a homogeneous mixture of two or more substances uniformly dispersed throughout a single phase
Term
Solute
Definition
in a solution, the substance that dissolves in the solvent
Term
Solvent
Definition
in a solution, the substance in which the solute dissolves
Term
Physical Change
Definition
a change of matter from one form to another, without a change in chemical properties
Term
Chemical Change
Definition
a change that occurs when one or more substances are changed into entirely news substances that have different properties.
Term
Kinetic Theory
Definition
states that all matter is made up of tiny, moving particles, the particles are always in motion, and at the same temperature, heavier particles move slower than lighter particles
Term
Energy
Definition
the ability to change or move matter; the capacity to do work.
Term
Thermal Energy
Definition
the energy that comes from the temperature of matter. The hotter the substance, the more its molecules vibrate, and therefore the higher it's thermal energy.
Term
Endothermic changes
Definition
energy is added, or required as a change of state takes place. Examples: melting and evaporation
Term
Exothermic changes
Definition
energy is released or removed, as a change of state takes place. (Examples: condensation and freezing)
Term
Law of Conservation of Mass
Definition
mass cannot be created or destroyed. The total mass of the reactants is the same as the total mass of the products.
Term
Law of Conservation of Energy
Definition
energy cannot be created or destroyed. Energy may be converted to another form during a physical or chemical change, but the total amount of energy present before and after the change is the same.
Term
Boyle’s Law
Definition
if the temperature of the gas remains the same, adding pressure will decrease the volume of the gas.
Term
Charles’s Law
Definition
the volume of a gas increases as the temperature increases, if the pressure does not change.
Term
Gay-Lussac’s Law
Definition
the pressure of a gas increases as the temperature increases, if the volume does not change.
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