Unit One Chemistry Review

22 terms by jjsmith94

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u kno

accuracy

how close measurement is to it's actual value, its in the court but not in a specific spot

precision

the exactness of the measure, consistant, but not necessarily right

significant figures

all the digits known as well as the ones estimated

atom

the smallest unit of an element that maintains the properties of an element

pure substance

a sample of matter, either a single element or a compound, that has definate chemical and physical properties

element

a substance that cannot be separated or broken down into into simpler substances by chemcial means; all atoms of an element have the same atomic number

molecule

The smallest unit of a substance that keeps all the physical and chemical properties of that substance; it can consist of one atom or two or more atoms bonded toether

compound

A substance made up of atoms of two or more different elements joined by chemical bonds.

mixture

A combination of two or more substances that are not chemically combined

homogeneous

Describes something that has a uniform structure or composition throughout

heterogeneous

Composed of dissimilar components

energy

the capacity to do work

physical change

A change of matter from one form to another without a change in chemical properties

chemical change

A change that occurs when one or more substances change into entirely new substances with different properties

evaporation

The change of a substance from a liquid to a gas

endothermic

Describes a process in which heat is absorbed from the environment

exothermic

Describes a process in which a system releases heat into the environment

laws of conservation of energy

The law that states that energy cannot be created or destroyed but can be changed from one form to another.

heat

The energy transferred between objects that are at different temperatures; energy is always transferred from higher-temperature objects to lower-temperature objects until thermal equilibrium is reached

kinetic energy

The energy of an object that is due to the object's motion

temperature

A measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object

specific heat

The quantity of heat required to raise a unit mass of homogeneous material 1 K or 1 degree Celsius a specified way given constant pressure an volume

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