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CHEM > CHEM LAB MIDTERMS > Flashcards

CHEM LAB MIDTERMS Flashcards

1
Q

transfer of thermal energy

A

b) Heat

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2
Q

study of heat flow that accompanies chemical reactions

A

Thermochemistry

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3
Q

measurement of heat

A

Temperature

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4
Q

energy contained within a system

A

thermal enerfy

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5
Q

Center of the universe

A

system

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6
Q

Rest of the universe outside the system

A

surroundings

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7
Q

exchange of both heat and mass with surroundings

A

Open system

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8
Q

exchange of HEAT only with surroundings

A

closed system

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9
Q

allows NEITHER energy nor mass to exchange with surroundings

A

isolated system

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10
Q

heat flows from SURROUNDING into the SYSTEM

A

Endothermic process

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11
Q

heat flows from SYSTEM into SURROUNDING

A

Exothermic process

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12
Q

Chemistry of heat measurement

A

Calorimetry

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13
Q

calorimeter

A

shows heat associated in a chemical reaction, closed-isolated container

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14
Q

heat of combustion is measured in constant-volume bomb calorimeter

A

Constant-volume calorimetry

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15
Q

measured using simple Styrofoam cu calorimeter, at constant pressure heat change is equal to enthalpy

A

Constant-pressure calorimetry:

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16
Q

heat is released or lost

A

exothermic reactions

17
Q

process absorbed or gained heat

A

Endothermic reactions

18
Q

solute is dissolved in a certain amount of solvent

A

dissolution

19
Q

reaction of an acid and a base to form salt and water

A

neutralization

20
Q

three-dimensional network of atoms, ions, or molecules

A

Crystal lattice

21
Q

Perfectly stacked unit cells at molecular level

A

Macroscopic crystals

22
Q

composed of oppositely charged ions (Na+ Cl-)

A

Ionic solid

23
Q

composed of individual molecules arranged regularly (H2O)

A

Molecular solid

24
Q

composed of vast number of atoms covalently bonded together (SiO2)

A

Network-covalent solid

25
Q

lattice of metal cations surrounded by a cloud of e- that move freely (Cu)

A

Metallic solid

26
Q

Each sphere represents an atom, ion, or molecule called

A

Lattice point

27
Q

1 atom/unit cell

A

simple cubic

28
Q

2 atom/unit cell

A

body centered

29
Q

4 atom/unit cell

A

Face centered

30
Q

6 atom/unit cell

A

Hexagonal-closed packed

31
Q

Ratio of the volume of atoms in unit cell over volume of unit cell

A

atomic packing factor

32
Q

calorimeter is a what type of system

33
Q

7-3-7 marble layer

A

Hexagonal Close-Packed (HCP) Structure

34
Q

5-4-5 marble layer

A

Face centered cubic structure

35
Q

4-1-4 marble layer

A

body centered cubic

36
Q

If you have a positive percent error it means that the experimental value is greater than the true value, then the ______

A

The true value is greater than the experimental value.

CHEM (7 decks)

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