Unit 1
Unit 2
Unit 3
Unit 4
Random
100
MnO4- is:
permanganate
100
What is the specific heat formula?
q=mcdeltaT
100
Is NOBr polar or nonpolar?
polar
100
What are the three types of intermolecular forces?
London dispersion, dipole-dipole, hydrogen bonding
100
Draw PF2Cl3
see picture
200
How many grams are in 6.5536 moles of phosphorus?
202.96g
200
What is the electron configuration of titanium?
1s22s22p63s23p64s23d2
200
What is the hybridization of the central atom in XeO4?
What are the approximate bond angles in this substance?
sp3, 109.5
200
A sample of helium gas at a pressure of 1.09 atm and a temperature of 28.3 °C, occupies a volume of 727 mL. If the gas is compressed at constant temperature until its pressure is 1.52 atm, the volume of the gas sample will be ____ mL.
521
200
All common sulfides are _, except for Group 1A, Group 2A, and ammonium.
insoluble
300
1.45x105 has _ sig figs.
3
300
How much energy is required to raise the temperature of 13.8 grams of solid gold from 24.3 °C to 36.6 °C ?
21.9 J
300
The formal charge on the central arsenic atom in AsO2- is:
0
300
A mixture of methane and nitrogen gases is maintained in a 5.07 L flask at a pressure of 3.39 atm and a temperature of 32.0 °C. If the gas mixture contains 4.33 grams of methane, the number of grams of nitrogen in the mixture is ____ g.
11.7 g
300
Calculate the de Broglie wavelength of the following.
An electron moving at a speed of 9.34×105 m s-1.
7.79×10-10 m
400
The oxidation number of nitrogen in KNO3 is:
+5
400
Calculate ΔH for the reaction C2H4(g) + H2(g)→ C2H6(g), from the following data:
C2H4(g) + 3 O2(g)→ 2 CO2(g) + 2 H2O(l) ΔH = —1411 kJ
C2H6(g) + 3.5 O2(g)→ 2 CO2(g) + 3 H2O(l) ΔH = —1560 kJ
H2(g) + 0.5 O2(g)→ H2O(l) ΔH = —285.8 kJ
Hoverall = -137 kJ
400
Calculate the lattice energy of LiBr(s) using the following thermodynamic data (all data is in kJ/mol).
- Li(s)ΔHsublimation = 139 kJ/mol
- Li(g)IE = 500 kJ/mol
- Br-Br(g)DBr-Br = 173 kJ/mol
- Br(g)EA = -345 kJ/mol
- LiBr(s)ΔH°f = -371 kJ/mol
752 kJ/mol.
400
The air over an unknown liquid is saturated with the vapor of that liquid at 31 °C and a total pressure of 0.976 atm. Suppose that a sample of 6.56 L of the saturated air is collected and the vapor of the unknown liquid is removed from that sample by cooling and condensation. The pure air remaining occupies a volume of 3.87 L at 12 °C and 1.00 atm. Calculate the vapor pressure of the unknown liquid at 31 °C.
0.347 atm
400
In the laboratory you dissolve 12.3 g of nickel(II) nitrate in a volumetric flask and add water to a total volume of 500 . mL.
What is the molarity of the solution?
0.269
500
2Fe(NO3)3(aq) + 3Na2CO3(aq) -> Fe2(CO3)3(s) + 6NaNO3(aq), the net ionic equation is:
2Fe3+(aq) + 3CO32-(aq) -> Fe2(CO3)3(s)
500
A student heats 64.62 grams of titanium to 97.82 °C and then drops it into a cup containing 83.71 grams of water at 22.01 °C. She measures the final temperature to be 28.90 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.76 J/°C. Assuming that no heat is lost to the surroundings calculate the specific heat of titanium.
0.545 J/g°C
500
Using average bond enthalpies , estimate the enthalpy change for the following reaction:
CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)
-668 kJ
500
A mixture of methane and helium gases, at a total pressure of 755 mm Hg, contains 3.91 grams of methane and 0.580 grams of helium. What is the partial pressure of each gas in the mixture?
PCH4 = ____ mm Hg
PHe = ____ mm Hg
473
282
500
MgS crystallizes with the NaCl structure and is represented in the following model.
If the radius of the Mg2+ ion is 86.0 pm and the radius of the S2- ion is 170 pm, what is the density of crystalline MgS?
2.79 g/cm3