Chapter 10
Write out the Lewis Dot structure for phosphorous.
.
.P:
.
What is the volume occupied by 0.255 mol Helium gas at 1.25 atm and 305 K?
5.11L
A substance has a definite shape and definite volume. What state is this substance in?
Solid
How many liters of a 0.114 M solution of NaOH contains 1.24 mols NaOH?
10.9 L
Write an equation for the reaction between aqueous HCl and aqueous Ca(OH)2
2 HCl
2 H2O (l)
CaCl2
Write the Lewis Dot structure for the NO3- ion. Include resonance if that appears.
(3 resonance structures)
A dramatic classroom demonstration involves cooling a balloon from room temperature (298 K) to liquid nitrogen temperature (77 K). If the initial volume is 2.7 L what is the volume after it cools?
0.70 L
Calculate the amount of water in grams that can be vaporized at its boiling point with 155 kJ of heat (DeltaH vap = 40.7 kJ/mol)
68.6 grams
To what volume should you dilute 0.100 L of a 10 M NaOH solution to obtain a 1.0 M NaOH solution?
1 L
Determine the H3O+ concentration in 1.5 M HCl
1.5 M H3O+
What is the electron and molecular geometry of PCl3
Tetrahedral
Trigonal Pyramidal
Calculate the number of mols of gas in a basketball that is inflated to a total pressure of 24.2 psi with a volume of 3.2L at 25 degrees celsius.
(1 atm = 14.7 psi)
0.22 mol gas!
Which halogen, Cl2 or I2, has the higher boiling point?
I2 -- it has a greater molar mass and therefore stronger dispersion forces!
Calculate the boiling point of a 1.7 m ethylene glycol soultion (kb = 0.512 and normal boiling = 100 degrees celsius)
100.87 degrees Celsius
Is a compound with a H3O+ concentration of 7.5 x 10 ^ -5 M acidic, basic, or neutral?
Acidic
Is NH3 polar? Show why or why not
Yes!
How many liters of Oxygen form when 294 grams of KClO3 completely react in this reaction (which is used in the ignition of fireworks)
2 KClO3 --> 2 KCl + 3 O2
Assume oxygen is collected at P=755 mmHg and T = 305 K
90.7 L
Are H2O and CH3CH2OH miscible? Why?
Yes, they are both polar and like-dissolves-like!
A soft drink contains 11.5% sucrose by mass. What volume of the soft drink, in mL, contains 85.2 grams sucrose?
712 mL
What is the H3O concentration of a solution with a pH of 4.80?
1.6x10^-5
Write out the Lewis Structure for the following molecules:
ClF5
NH4Cl
ClF5 is an expanded octet
NH4Cl is an ionic and covalent structure need to show both in Lewis Dot structure
The following reaction consumes 2.45 kg of CO gas:
CO (g) + H2O (l) --> CO2 (g) + H2 (g)
How many total L gas are formed if the products are collected at STP?
3918.6 L
An 8.5 gram ice cube is placed into 255 grams of water. Calculate the temperature change in the water upon the complete melting of the ice. (HINT q = mcAt and q = nAHfus)
2.65 degrees Celsius
A 125 mL sample of an 8.5 M NaCl solution is diluted to 2.5 L. What volume of the diluted solution contains 10.8 grams of NaCl? (HINT you need molarity)
5.74 L
The titration of 10 mL of an HCl solution of unknown concentration requires 12.54 mL of a 0.100 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution?
0.125 M