Part 8 Flashcards

1
Q

when bonds are broken what occurs?

A

endothermic rxn

+delta H

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2
Q

when bonds are formed what occurs?

A

exothermic rxn

+delta H

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3
Q

aggregates of positively and negatively charged ions are …?

A

ionic solids

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4
Q

what are the physical properties of ionic solids? why so?

A

high melting point, high boiling point, poor electrical conduction in solid phase.

(due to strong electrostatic interactions)

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5
Q

what is a metallic solid?

A

consists of metal atoms packed together as closely as possible

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6
Q

what are the physical properties of metallic solids? why so?

A

high melting points, high boiling points

due to strong covalent interactions

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7
Q

the repeating units of crystals (both ionic and metallic) are represented by what?

A

unit cells

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8
Q

what are the three cubic unit cells?

A

simple
body-centered
face-centered

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9
Q

how many atoms are in a body-centered cubic unit cell?

A

2

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10
Q

how many atoms are in a face-centered cubic unit cell?

A

4

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11
Q

a solid can be either …

A

crystalline (3d - salt)

amorphous (not 3d- glass)

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12
Q

are most solids crystalline or amorphous?

A

crystalline

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13
Q

what are the two most common forms of crystals ? (solid structure)

A

metallic and ionic

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14
Q

vapor pressure increases as ______ increases.

A

vapor pressure increases as temperature increases

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15
Q

the temperature at which the vapor pressure of the liquid equals the external pressure is called what?

A

boiling point

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16
Q

when a solid goes directly to gas the process is called what?

A

sublimation

17
Q

what is the reverse of sublimation?

A

deposition : gas to solid

18
Q

fusion is AKA

A

melting

19
Q

vaporization is AKA

A

evaporation

20
Q

delta H will be -/+ for melting, vaporization and sublimation?

A

positive

endothermic