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chemistry > interconversions > Flashcards

interconversions Flashcards

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1
Q

liquid to solid

A

freezing
releases energy

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2
Q

solid to liquid

A

melting
requires energy

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3
Q

liquid to gas

A

boiling/ evaporation
requires energy

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4
Q

gas to liquid

A

condensation
releases energy

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5
Q

gas to solid

A

deposition
releases energy

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6
Q

solid to gas

A

sublimation
requires energy

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7
Q

melting

A

the conversion of 1solid to liquids which occurs at the 2melting point with the use of 3latent heat
added heat of fusion causes particles to gain more kinetic energy and intermolecular forces to weaken causing the particles to rotate more around each other and break away from their fixed positions
there is not an increase of temperature but in energy

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8
Q

what is latent heat

A

hidden heat as temperature does not rise when melting the solid
heat applied with no temperature change

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9
Q

what is heat of fusion

A

energy required to melt a solid

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10
Q

how many states present during a change of state

A

two

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11
Q

what is the boiling point 2

A

particular temperature at which boiling takes place
does not change during process or change of state

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12
Q

what is waters boiling point

A

100 degrees celcius

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13
Q

define boiling

A

change of state from water to gas with the use of heat where particles gain energy and bump into each other more often and bounce further apart which is the liquid expanding

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14
Q

what kind of heat is involved in boiling

A

latent heat of vaporization to overcome forces in liquid and not raise the temperature

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15
Q

define boiling 2

A

rapid
gas bubbles projected throughout
set temperature

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16
Q

define evaporation

A

slow
occurs at surface
no bubbling

17
Q

state 3 differences between boiling and evaporation

A

evap takes place over range of temp under bp
occurs at surface
results in cooling

boiling takes place at a fixed temperature
occurs throughout
remains constant

18
Q

sublimation give 5 examples

A

iodine ammonium chloride dry ice moth balls

19
Q

which substances have fixed boiling/melting point

A

pure substances

20
Q

what does the addition of impure substances do?

A

depresses or lowers melting/freezing point of a substance or boiling points

21
Q

state melting, freezing and boiling points of pure h2o

A

melts at 0 degrees Celsius
freezes at 0 degrees celsius
boils at 100 degrees celsius

chemistry (9 decks)

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