PERIODIC TABLE/OTHER SHENANIGANS
ELECTRONS AND MOLECULES
STOICHIOMETRY/GASES
EQUILIBRIUM/ACIDS AND BASES
RANDOM :)
100
Calculate the molar mass of sodium hydroxide (NaOH).
40 grams/mol
100
Draw the Lewis dot structure for NF3
100
What is the volume of 2 moles of ammonia gas at STP? (hint: 22.4 L = 1 mole of gas at STP)
44.8 liters
100
What is the molarity of a solution with 3 moles of NaOH dissolved in 0.25 liters of solution?
12 M NaOH
100
How many significant figures does 10 pens have?
Infinite!
Because 10 pens are a number, NOT measurement!!
200
Which of the following elements has the lowest ionization energy?
Ca Be Ba
Ba (barium)
200
What is the molecular shape and polarity of NF3?
Trigonal pyramidal and polar
200
2Na + Cl2 → 2NaCl
If 3.64 moles of Na is reacted with an excess of chlorine gas, how many moles of NaCl will be produced?
3.64 moles
200
Write the equilibrium expression (Keq) for:
CaCO3 (s) ←→ CaO(s) + O2 (g)
Keq = [O2]
200
Which has the largest radius?
O O2- Ne
O2-
300
How many unpaired electrons does nitrogen have?
Three
300
Element X has an electron configuration of 1s22s22p63s23p64s23d104p65s24d105p5 What is Element X?
Iodine
300
At what temperature will 0.654 moles of neon gas occupy 12.30 liters at 1.95 atmospheres? (R = 0.0821 atm * L/ K * mol)
447 K
300
Write the equilibrium expression and calculate the value of the Keq for:
SO3 (g) + H2O(g) ←→ H2SO4 (l)
[SO3] = 0.400 M, [H2O] = 0.480 M, [H2SO4] = 0.600 M
Keq = 1/([SO3][H2O]) = 5.208 M
300
Balance the following equation:
C3H8 + O2 → CO2 + H2O
C3H8 + 5O2 → 3CO2 + 4H2O
400
How would you write out a Se (selenium) anion? (aka what’s its charge)
Se2-
400
What is the main intermolecular force of dinitrogen dihydride (N2H2)?
What is hydrogen bonding?
400
Using H2 + O2 → H2O, at STP, how many grams of water could form from the reaction of 44.8 liters of O2?
72 grams
400
If a 0.50 M solution of a HCl acid dissociates in an aqueous solution, what is the equilibrium concentration of the dissociated ions?
[H+] = [Cl-] = 0.50 M
400
What happens if the temperature is decreased for the following reaction at equilibrium? What about adding O3 gas?
2SO3 (g)+ heat ←→ 2SO2(g)+ O2 (g)
Shifts to the left; no change
500
What is the most electronegative element?
Flourine
500
What is the frequency of light that has a wavelength of 310 nm?
9.7 * 1014 Hertz
500
AgNO3 + MgBr2 → AgBr + Mg(NO3)2
50.0 g of MgBr2 and 100.0 grams of AgNO3 are mixed together. Which is the limiting reactant and why?
MgBr2 is the limiting reactant
500
HF is a weak base. Its initial concentration is 0.390 M and equilibrium concentration of H+ is 4.4 * 10-3 M. Calculate Ka for HF.
Ka = 9.73 * 10-4
500
KClO3 → 2KCl + 3O2
If 5.0 g of KClO3 is decomposed, what volume of O2 is produced at STP?
1.4 Liters of O2