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13 chemistry test

QuestionAnswer
The energy an object has because of its motion is called kinetic energy
true about the assumptions of the kinetic theory concerning gases gas is composed of particles with insignificant volume that are relatively far apart from each other. paths of uninterrupted travel of particles in a gas are relatively short because the particles are constantly colliding w each other or w/ other objects
conversion factor 1 atm (atmosphere) = 760 mm Hg (mercury) = 101.3 kPa (kilopascals)
according to the kinetic theory collisions between particles in a gas are perfectly elastic because kinetic energy is transferred without loss from one particle to another and the total kinetic energy. true
gas pressure results from the force exerted by a gas per unit surface area of an object
simultaneous collisions of billions of particles in a gas with an object result in gas pressure
what force holds the particles of air in earth's atmosphere? atmosphereic pressure
what kind of pressure is measured with a barometer? atmospheric pressure
units of pressure kpa, mm Hg, atm, pascal
standard temperature and pressure (stp) are defined as a temperature of 0 degrees celsius and a pressure of 101.3 kPa or 1 atm
what happens to the temperature of a substance when the average kinetic energy of its particles increases? results in an increase in temperature
temperature on the _______ scale is directly proportional to the average kinetic energy of the particles of a substance. kelvin
the kinetic theory states that there are no attractions between the particles of a liquid. false
the conversion of a liquid to a gas or vapor is called vaporization
when vaporization occurs at the surface of a liquid that is not boiling the process is called evaporation
as a liquid evaporates, why do only some of the particles break away from the surface of the liquid? why does the liquid evaporate faster if the temperature is increased? during evaporation only those molecules with a certain minimum kinetic energy can escape from the surface of the liquid
what causes the chill you may feel after stepping out of a swimming pool on a warm windy day? evaporation makes it feel cooler
the boiling point of a liquid is the temperature at which the vapor pressure of the liquid is just equal to the eternal
after a liquid reaches its boiling point its temperature continues to rise until all the liquid vaporizes. false
although particles in solids have kinetic energy the motion of particles in solids is restricted to vibrations about fixed points. true
a solid melts when the organization of its particles break down
the temperature at which the liquid and solid states of a substance are in equilibrium is the same as the melting point and the freezing point of the substance true
how are particles arranged in a crystal? particles are arranged in an orderly, repeating, three dimensional pattern
what type of solid has a relatively low melting point? molecular solids
do all solids melt when heated? no wood and sugar cane decompose when heated
true or false. Some solid substances can exist in more than one form. Give an example to support your answer. true example: carbon it comes in the form of graphite, diamonds, and bucky balls.
two or more different molecular forms of the same element in the same physical state are called allotropes
what is an amorphous solid? lacks and ordered internal strucutre
solids that are amorphous solid plastic, glass, and rubber
how are glasses different from crystalline solid? glasses do not melt at a definite temperature. the internal structure of glass is intermediate free flowing liquid and crystallizing solid. softens when heated. breaks into irregular jagged pieces when shattered.
Created by: EmmaRoseDavis
 

 



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