exam 1 stuff
What equation relates speed of light, wavelength, and frequency?
c = λν
what is the electron configuration for potassium?
[Ar] 4s1
balance:
Fe + H2O = Fe3O4 + H2
3Fe + 4H2O = Fe3O4 + 4H2
Identify the element being oxidized, the element being reduced, the oxidizing agent, and the reducing agent in the following reactions
4Al + 3O2 = 2Al2 + O3
Al is oxidized, O2 is reduced, Al is the reducing agent, and O2 is the oxidizing agent
electrolyte v. nonelectrolyte
electrolyte- substance that
dissolves in water to yield a
solution that conducts electricity
nonelectrolyte- substance that dissolves in
water to yield a solution that
does not conduct electricity
Exactly 1 m3 is equal to how many Liters?
1000 L
what is the name of this compound?
Fe2S3
iron (III) sulfide
what are the oxidation numbers of ClO3-?
Cl- +5
O- -2 (x3)
Calculate the overall change in internal energy, ΔU, (in joules) for a system that absorbs 188J of heat and does 141J of work on its surroundings
47 J
What is the bond angle in ClO4-?
109
The diameter of an atom is approximately 1 × 10-8 cm. What is this diameter when expressed in
nanometers?
1 × 10 3 nm
Determine the empirical formula of a compound that is 30.45 percent nitrogen and 69.55 percent oxygen by mass. Given that the molar mass of the compound is approximately 92 g/mol, determine the molecular formula of the compound.
NO2
Write the balanced equation for the reaction given below:
CuCl2 + NaNO3 Cu(NO3)2 + NaCl
If 15 grams of copper (II) chloride react with 20. grams of sodium nitrate, how much sodium chloride can be formed?
13.03 grams
exothermic v. endothermic
exothermic- heat is released, heat is a product
endothermic- heat is absorbed, heat is a reactant
What is the molar mass of ammonium nitrate?
80.05 g/mol
Use the de Broglie relationship to determine the wavelength of an 85-kg person skiing at 50 km/hr
5.6 x 10-37 m
what is the percent composition by mass of sodium oxide?
74.21% sodium (Na) and 25.79% oxygen (O)
How many sigma and how many pi bonds are present in glucose?
21 sigma and 6 pi
Balance this redox reaction:
Cr(s) + Ni2+(aq) = Cr3+(aq)+ Ni(s)
3Ni2+(aq) + 2Cr(s) = 3Ni(s) + 2Cr3+(aq)
what is the photoelectric effect equation?
hv = Ek + W
Ek = is the kinetic energy of the
ejected electron
W= the binding energy of the electron
How many atoms are in 1 gram of Carbon
5. x 1022 atoms
Determine the number of water molecules and the numbers of H and O atoms in 3.26 g of water
1.09 x1023 H2O molecules
2.18 x1023 H atoms
1.09 x1023 O atoms
Starting with a 2.0 M stock solution of hydrochloric acid, four standard solutions (1 to 4) are prepared by sequential diluting 10.00 mL of each solution to 250.00 mL. Determine (a) the concentrations of all four standard solutions and (b) the number of moles of HCl in each solution.
D1: 8.00 x 10-2M , 2.00 x 10-2mol
D2: 3.20 x 10-3M, 8.00 x 10-4mol
D3: 1.28 x 10-4M, 3.20 x 10-5mol
D4: 5.12 x 10-6M, 1.28 x 10-6mol
Determine the work done (in joules) when a sample of gas extends from 552 mL to 891 mL at constant temperature (a) against a constant pressure of 1.25 atm, (b) against a constant pressure of 1.00 atm, and (c) against a vacuum (1L atm = 101.3 J)
a. -42.9J
b.-34.3J
c.OJ
bicarbonate
HCO3-