CHEM LAB MIDTERMS

Question 1

transfer of thermal energy

Answer 1

b) Heat

Question 2

study of heat flow that accompanies chemical reactions

Answer 2

Thermochemistry

Question 3

measurement of heat

Answer 3

Temperature

Question 4

energy contained within a system

Answer 4

thermal enerfy

Question 5

Center of the universe

Answer 5

system

Question 6

Rest of the universe outside the system

Answer 6

surroundings

Question 7

exchange of both heat and mass with surroundings

Answer 7

Open system

Question 8

exchange of HEAT only with surroundings

Answer 8

closed system

Question 9

allows NEITHER energy nor mass to exchange with surroundings

Answer 9

isolated system

Question 10

heat flows from SURROUNDING into the SYSTEM

Answer 10

Endothermic process

Question 11

heat flows from SYSTEM into SURROUNDING

Answer 11

Exothermic process

Question 12

Chemistry of heat measurement

Answer 12

Calorimetry

Question 13

calorimeter

Answer 13

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

Question 14

heat of combustion is measured in constant-volume bomb calorimeter

Answer 14

Constant-volume calorimetry

Question 15

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

Answer 15

Constant-pressure calorimetry:

Question 16

heat is released or lost

Answer 16

exothermic reactions

Question 17

process absorbed or gained heat

Answer 17

Endothermic reactions

Question 18

solute is dissolved in a certain amount of solvent

Answer 18

dissolution

Question 19

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

Answer 19

neutralization

Question 20

three-dimensional network of atoms, ions, or molecules

Answer 20

Crystal lattice

Question 21

Perfectly stacked unit cells at molecular level

Answer 21

Macroscopic crystals

Question 22

composed of oppositely charged ions (Na+ Cl-)

Answer 22

Ionic solid

Question 23

composed of individual molecules arranged regularly (H2O)

Answer 23

Molecular solid

Question 24

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

Answer 24

Network-covalent solid

Question 25

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

Answer 25

Metallic solid

Question 26

Each sphere represents an atom, ion, or molecule called

Answer 26

Lattice point

Question 27

1 atom/unit cell

Answer 27

simple cubic

Question 28

2 atom/unit cell

Answer 28

body centered

Question 29

4 atom/unit cell

Answer 29

Face centered

Question 30

6 atom/unit cell

Answer 30

Hexagonal-closed packed

Question 31

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

Answer 31

atomic packing factor

Question 32

calorimeter is a what type of system

Answer 32

isolated

Question 33

7-3-7 marble layer

Answer 33

Hexagonal Close-Packed (HCP) Structure

Question 34

5-4-5 marble layer

Answer 34

Face centered cubic structure

Question 35

4-1-4 marble layer

Answer 35

body centered cubic

Question 36

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

Answer 36

The true value is greater than the experimental value.