Exam 1
What is the maximum number of electrons allowed in the 5f subshell?
14
What are the 3 exceptions to the octet rule?
B and Al (6)
H (2)
A peanut butter and jelly sandwich contains 9.00 g of fat, 6.00 g of protein, and 25.0 g of carbohydrate. How many Calories does this sandwich provide?
205 Cal
Red blood cells are placed into a solution, and the cells begin to swell. How should the solution be classified?
the joining of 2 lighter nuclei to form a heavier nucleus
nuclear fusion
What is the correct formula for copper(II) phosphate?
Cu3(PO4)2
How many bonding electrons and non-bonding electrons are in N2H4?
10 bonding and 4 non-bonding
Express the equilibrium constant for the following reaction. P4 + 5 O2 ⇌ P4O10
K=[P4H10]/[P4][O2]5
A solution is made by mixing 250.0 mL of water and 650.0 mL of acetone. What is the v/v% of the solution?
27.78%
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
12.5 g
Carry out the following calculation and report the answer using the proper number of significant figures: 549.101 + 8.12 + 95.0076 – 651.9
0.3
How many moles of CO2 are in 211 g of CO2?
4.80 mol
When the pressure decreases for a reaction at equilibrium, in which direction does the equilibrium shift?
towards the side with more moles
If the concentration of H3O+ in an aqueous solution is 7.6 × 10-9 M, the concentration of OH- is
1.31x10-6 M
42K -> 0-1e + _______
4220Ca
Convert 3000. μg to nanograms.
3,000,000 ng
Write the balanced combustion reaction of C4H10. What is the coefficient of O2?
13
A balloon filled with helium gas at 293 K occupies 2.91 L at 1.0 atm. What is the volume of the balloon at STP?
2.71 L
Calculate the concentration in ppm of a pollutant that has been measured at 450 mg per 150 kg of sample.
3.0 ppm
Nuclear decay with no mass and no charge
gamma decay
A doctorʹs order is 125 mg of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliters of the suspension are required?
2.5 mL
Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction.
Molar mass: Fe2O3 = 159.70 g/mol; Al = 26.98 g/mol; Al2O3 = 101.96 g/mol; Fe = 55.85 g/mol
Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)
81.9%
Calculate the heat (in calories) for 105 g of ice (H2O) to go from 0.0°C to 15.0°C
9126.075 cal
What is the pH of a buffer with 0.050 M H2CO3 and 0.50 M NaHCO3? Ka = 4.3 × 10-7.
7.37
235U-> 91Kr + ?
142Ba