Fundamentals, Atoms, & Elements
This is the names of the following compounds: SiCl4, N2O5, NaNO2
Bonus 50pt: (CaSO4 • 1/2H2O)
What is silicon tetrachloride, dinitrogen pentoxide, sodium nitrite, and calcium sulfate hemihydrate?
This is the amount of sucrose (in grams) in 33.0 mL of a 0.85 M solution (MMsucrose = 342.2965 g/mol)
What is 9.60 grams sucrose?
During a chemical reaction, 75 kJ of energy is transferred to the surroundings, initially at 22.3 °C, as heat. The final temperature of the surroundings was recorded as 37.1 °C. This is the heat capacity (in J/K) of the surroundings.
What is 5.1 x 103 J/K?
This set of quantum numbers cannot occur together to specify an orbital.
a) n = 2, l = 1, ml = -1
b) n = 3, l = 2, ml = 0
c) n = 3, l = 3, ml = 2
d) n = 4, l = 3, ml = 0
What is C (l must be less than n)?
CH3OH can be synthesized by the following reaction.
CO(g) + 2H2 (g) → CH3OH (g)
This is the volume of H2 (g) in L, measured at 748 mmHg and 86 C, that is required to synthesize 25.8 g CH3OH.
What is 48.2 L?
N2(l) has a density of 0.808 g/mL while N2(g) has a density of 1.15 g/L (at 298 K).
This volume of N2(g) forms when 1.0 liter of N2(l) vaporizes.
What is 703 L N2(g)?
Suppose you have a balloon and inside the balloon there is 5.145g of H2, 8.745g of CO2, 20.34g of N2, and 4.935g of O2. This is the mole fraction of each component, respectively.
What is 0.7029, 0.05473, 0.1999, 0.04247?
This is a balanced enthalpy of formation reaction for liquid acetone (C3H6O) from its constituent elements in their standard states. Include correct charges and phases for full credit.
3C(s,graphite) + 3H2(g) + 0.5O2 (g) → C3H6O(l)
DAILY DOUBLE
What is 1s22s22p63s23p64s13d5 ?
How will the volume of a gas change if the pressure is tripled at constant temperature?
⅓
This is the number of atoms in 3.24 liters of O2(g) at STP.
What is 1.74*10^23 atoms?
A sample of [Co(CH3COO)2 ·xH2O] is 23.5% cobalt by mass. This is the value of x.
What is 4?
A balloon filled with 0.5 moles (8 g) of O2 gas at 1.00 atm and 28.0 ̊C has a volume of 12.36 L. The temperature of the gas is decreased to 5.0 ̊C.
This is the ‘work’ component of the change in internal energy in J. Cs, O2(g) = 0.918 J/g ̊C
What is 96.0 J?
Which has a larger first ionization energy: an F8+ excited cation with its electron in the 2p state or a neutral F atom in its ground state? Explain.
IEexcited cation >> IEF
Zeff (excited cation) >> Zeff(F)
If you decrease the volume of a gaseous sample by a factor of 4 while maintaining constant pressure, how would the temperature of the gas change?
¼
Magnesium has three stable isotopes, Mg-24 (78.99% abundant, 23.9850 amu), Mg-25 (10.00% abundant, 24.9858 amu), and Mg-26. This is the atomic mass of the Mg-26 isotope.
What is 25.98 amu?
This is the mass (in grams) of exactly 100000000. atoms of fluorine if the relative atomic mass of fluorine is 18.998403 on a scale where exactly 12 is the relative atomic mass of Carbon-12.
What is 3.1547584E-15 grams?
In walking 1 km, you use about 100 kJ of energy. This is the amount of energy you save by walking 1 km instead of driving a car that gets 8.0 km L-1 gasoline (19 miles/gal).
The density of gasoline is 0.68 g cm-3 and its enthalpy of combustion is -48 kJ g-1.
What is ~3800 kJ?
Refer to PowerPoint
A: l =1, j = 3, n = 4 -> 4p
B: l =0, j = 1, n = 1 -> 1s
C: l =2, j = 3, n = 5 -> 5d
D: l =1, j = 2, n = 3 -> 3p
Suppose that you have a reaction that creates 35.21g of sulfur hexafluoride gas.
What is the density of SF6(g) at
STP in g/L?
SATP in g/L
6.52 g/L
5.97 g/L
A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 424 cm3 and the total mass is 4.40 kg. This is the percentage of the spheres that are copper. (The density of lead is 11.34 g/cm3 and the density of copper is 8.96g/cm3)
What is 40.4% copper spheres?
A solution is prepared by dissolving BaCl2(s) in water. A tiny aliquot (small amount of solution) contains 2155 water molecules, three Ba2+ions and six Cl– ions. This is the concentration (in M) of chloride ion in the solution.
What is 0.1545 M?
A 25.0-gram sample of copper at 90.0 °C is placed in 100.0 grams of water at 20.0°C. The copper and water quickly come to the same temperature by the process of heat transfer from copper to water. This is the final temperature of the water.
Take the molar heat capacity of copper to be 24.4 J mol−1 K−1 and that of H2O(l) to be 75.3 J mol−1 K−1.
What is 294.7 K?
Arrange in order of increasing ionization energy:
Si, P, Ga, S, Ca.
Ga < Ca < Si < S < P
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(l).
200 torr of NH3 (g) and 200 torr of O2 (g) are mixed in a rigid, 4.00 L container at 25.0 ̊C.
This is the total pressure (in torr) in the container after the rxn. Assume 100% yield
What is 200 torr?