Unit 1
Write each of the following in scientific notation:
a. 210 000
b. 0.000 000 347
c. 0.0572
d. 8200
a. 2.1 x 105
b. 3.47 x 10-7
c. 5.72 x 10-2
d. 8.2 x 103
Write the abbreviated electron configuration and draw the abbreviated electron orbital diagram for krypton.
[Ar] 4s23d104p6
[Ar] [↑↓] [↑↓] [↑↓] [↑↓] [↑↓] [↑↓] [↑↓] [↑↓] [↑↓]
4s 3d 4p
A sample of hydrogen (H2) gas at 127°C has a pressure of 2.00 atm. At what final temperature, in degrees Celsius, will the pressure of the H2 decrease to 0.250 atm, if volume and amount of gas do not change?
-223°C
Identify the conjugate acid-base pairs in the following equation and whether the equilibrium mixture contains mostly products or mostly reactants:
NH3(aq) + HNO3(aq) ⇄ NH4+(aq) + NO3-(aq)
HNO3/NO3-
NH4+/NH3
Equilibrium mixture contains mostly products
Perform each of the following calculations and give an answer with the correct number of significant figures:
a. 3.482 + 8.51 + 16.324
b. 48.2 x 1.6 x 2.12
c. (0.518)(36) / 3.74
a. 28.32
b. 160
c. 5.0
Classify the CO2 molecule as polar or nonpolar. Identify the strongest intermolecular force for this molecule.
Non-polar
Dispersion forces
Potassium nitrate has a solubility of 32 g of KNO3 in 100. g of H2O at 20°C. Determine if the following forms an unsaturated or saturated solution at 20°C:
Adding 32 g of KNO3 to 200. g of H2O
Unsaturated
What is the equilibrium concentration of HNO2 if the equilibrium concentrations of NO2- and H3O+ are found to be 5.2 x 10-3 M?
HNO2(aq) + H2O (l) ⇄ H3O+ (aq) + NO2- (aq) [Ka = 4.5 x 10-4]
6.0 x 10-2
How much heat is required to warm 275 g of water from 76°C to 87°C?
13000 J
Draw the lewis structure for NF3 and determine the electron group geometry shape.
tetrahedral and trigonal pyramidal
Refer to google slides for lewis structures
Write the net ionic equation to show the formation of a solid (insoluble ionic compound) when the following solutions are mixed.
AgNO3(aq) and LiBr(aq)
Ag+(aq) + Br-(aq) → AgBr(s)
What is the [H3O+] of a solution if [OH-] is 5.0 x 10-8 M? Is the solution acidic, basic, or neutral?
2.0 x 10-7
Acidic
(go to slides)
(go to slides)
What type of reaction is the following?
4C5H9O + 29O2 --> 20CO2 + 18H2O
Combustion
How would each of the following change the rate of the reaction shown here?
2SO2(g) + O2(g) → 2SO3(g)
a. Adding some SO2(g) to the reactants side
b. Increasing the temperature
c. Adding a catalyst
d. Removing some O2 from the reactants side
a. increase
b. increase
c. increase
d. decrease
What is the pH of a solution with a [H3O+] of 1.0 x 10-11. Is this solution acidic or basic?
11.00
Basic
Which atom has the largest atomic radius?
a. Al or B
Which atom has the smallest metallic character?
b. Na or F
Which atom has the greatest ionization energy?
c. Ca or Ba
a. Al
b. F
c. Ca
How many grams of hydrogen (H2) are produced from 80.0 g of CH4 and 16.3 g of water? What is the limiting reactant?
CH4 + 2H2O --> 4H2 + CO2
3.65 g of H2
The limiting reactant is H2O
Indicate whether each of the following equilibrium mixtures contains mostly products or mostly reactants:
a. CO(g) + Cl2(g) ⇆ COCl2(g) Kc = 5.0 x 10-9
b. 2NO(g) + O2(g) ⇆ 2NO2(g) Kc = 6.0 x 1013
a. Mostly reactants
b. Mostly products
Calculate the [H3O+] of a solution that has a pH of 12.5.
3 x 10-13