Chem lab final

Question 1

AgCl

Answer 1

White ppt

Question 2

PbCrO4

Answer 2

Yellow ppt

Question 3

PbSO4

Answer 3

White ppt

Question 4

CdS

Answer 4

Yellow ppt

Question 5

Na3Co(CO3)3

Answer 5

Green color

Question 6

Ni(C4H7O2N2)2

Answer 6

Red ppt

Question 7

Al(OH)3

Answer 7

Red ppt

Question 8

BaCrO4

Answer 8

Yellow ppt

Question 9

Ba^2+

Answer 9

Green flame test

Question 10

CaC2O4

Answer 10

White ppt

Question 11

Ca^2+

Answer 11

Red flame test

Question 12

Na^+

Answer 12

Yellow flame test

Question 13

Test NH3 for presence of NH4^+ by

Answer 13

Smell and red litmus paper

Question 14

K^+

Answer 14

Violet flame test

Question 15

endothermic

Answer 15

energy + reactants → products

Question 16

exothermic

Answer 16

reactants → products + energy

Question 17

Le Chatelier’s principle

Answer 17

If an equilibrium is stressed, then the reaction shifts to reduce the stress

Question 18

Dilution equation

Answer 18

MiVi= MfVf

Question 19

pH

Answer 19

pH = -log[H+]

Question 20

Mole fraction

Answer 20

Xsolute = mol of solute / total mol
Xsolvent = mol of solvent / total mol
Xsolute + Xsolvent = 1

Question 21

Group 2 cations pH

Answer 21

pH range of 0.5 ±0.3

Question 22

Group 3 cations pH

Answer 22

pH between 8-10

Question 23

Group 4 cations pH

Answer 23

pH at ~5

Question 24

Group 1 cations reagents

Answer 24

Ag+, Pb2+

Question 25

Group 2 cations reagents

Answer 25

Pb2+, Cu2+, Cd2+

Question 26

Group 3 cations reagents

Answer 26

Ni2+, Fe3+, Al3+, Co2+

Question 27

Group 4 cations reagents

Answer 27

Ba2+, Ca2+

Question 28

Group 5 cations reagents

Answer 28

NH4+, K+, Na+

Question 29

Addition of base

Answer 29

Shifts left

Question 30

Addition of acid

Answer 30

Shifts right

Question 31

Addition of more product

Answer 31

Shifts left

Question 32

Addition of more reactant

Answer 32

Shifts right

Question 33

Increase in the temperature (exothermic)

Answer 33

Shifts left

Question 34

Increase in the temperature (endothermic)

Answer 34

Shifts right

Question 35

Complete the net ionic equation:
Pb^2+(aq) + CrO4^2-(aq) —->

Answer 35

Pb^2+(aq) + CrO4^2-(aq) —->PbCrO4

Question 36

Complete the net ionic equation:
AgCl(s) + NH3(aq) —–>

Answer 36

AgCl(s) + NH3(aq) —–> (AgNH3)2^+(aq) + Cl^-(aq)

Question 37

Ksp equation

Answer 37

Ksp=[C]c[D]d

Question 38

Kc equation

Answer 38

Kc = -[C]c[D]d / [A]a[B]b

Question 39

Ammonia

Answer 39

NH3

Question 40

Ammonium cation

Answer 40

NH4^+