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Chem 101 > Lecture 32 & 33 > Flashcards

Lecture 32 & 33 Flashcards

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1
Q

What does water dissolve

A

Ionic solids
Polar substances
Non-polar substances (atmospheric gases)

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2
Q

What are the dominant forces of an ionic structure

A

Ion-ion attraction

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3
Q

What are the dominant forces of a covalent network structure

A

Covalent bonds

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4
Q

What are the dominant forces of a metallic structure

A

Metallic bond

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5
Q

What is a unit cell

A

The smallest repeat unit, which reproduces the entire crystal structure

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6
Q

What is a lattice

A

An imaginary array of points that describes the arrangement of particles that form a crystal

Consists of all points with identical surroundings

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7
Q

What is a simple cubic

A

Has 8 corner positions

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8
Q

What is a body-centred cubic

A

Has 8 corners and 1 center

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9
Q

What is a face centred cubic

A

Has 8 corners and 6 faces

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10
Q

What is the coordination number

A

The number of nearest neighbours of a particle in a crystal

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11
Q

How many cells is a corner shared by

A

1/8 of cells

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12
Q

How many cells is a face shared by

A

1/2 of cells

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13
Q

How many cells is an edge shared by

A

1/4 of cells

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14
Q

How many cells are inside a cell (not shared)

A

1

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15
Q

What is the most efficient packing efficiency

A

Hcp( hexagonal closet packing): ABAB formation, covers orange spaces

Ccp: cubic closet packing: ABC formation, covers white spaces

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16
Q

What does simple cubic contain

A

CN: 6

1 atom per cell

17
Q

What does Body-centred cubic contain (bcc)

A

CN: 8

2 at atoms per cell

18
Q

What does hcp contain

A

CN: 12

6 atoms per cell

19
Q

What does ccp contain

A

CN: 12

4 atoms per cell

20
Q

What are the three common structures in metallic elements

A

Lattice
Hcp: primitive hexagonal
Ccp: face-cantered cubic
Bcc: body-centred cubic

21
Q

What are larger anions found in

A

Close-packing arrangements (ccp or hcp)

22
Q

What are smaller cations found in

A

Interstices (small holes)

23
Q

What are two common structure types for ionic solids

A

NaCl-type (rocksalt): anions in ccp arrangement, cations in octahedral holes (CN=6)

Li2O-type (antifluoride): anions in ccp arrangement, cations in tetrahedral holes (CN = 4)

Chem 101 (11 decks)

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