Atoms and Molecules
Stoichiometry
Thermo
Gas Laws
100
Name the acid: HBrO2
Bromous acid
100
A car is made up of 1 steering wheel, 4 wheels, 1 battery, and 5 seats. If a factory has 10,000 car seats, 20,000 wheels, 6000 batteries, and 2000 steering wheels, how many cars can be made?
2000
100
When something hot is added to something cold, why do we set -q = q? What law allow us to do this?
Law of conversation of energy
First law of thermodynamics
qrxn + qsoln = 0
100
How many moles of H2 are in a 71.95 L container at 177 kPa and 537.4 K?
2.85 mol
200
Mg(OH)2 is a: weak, non, or strong electrolyte
Weak
200
Remember the poor tarantula from week 1? The one that got stung by a parasitic wasp? It's still alive but paralyzed, and the wasp larvae has hatched and is ready to emerge. If the larvae drinks 300 microliters of the spider's blood 5 times a day, how many weeks does it take for the larvae to completely drain a spider with 50 mL of blood?
4.8 weeks!
So in our 5 week summer session the larvae has eaten the spider from the inside out :'(
200
2 P + 3 Cl2 → 2 PCl3 + 576 kJ
If 135.9 grams of PCl3 are produced, how many kJ of heat will be absorbed or released?
-285 KJ
200
A sample of Cl2 experiences a change in volume from 13.6 L to 58.59 L. If its new pressure is 4.862 atm, what was its original pressure in atmospheres?
20.9 atm
300
What is the oxidation number of sulfur in ammonium sulfate?
+6
300
How many mL of 1.50 M nitric acid is required to react with 100.0 g copper (I) oxide?
14 HNO3 + 3 Cu2O --> 6 Cu(NO3)2 + 2 NO + 7 H2O
2170 mL
300
Given values:
Substance: selenium (Se)
heat transferred (q): 25346 J absorbed
specific heat capacity (c): 0.3224 J/(g·K)
amount (m): 218.4 g
Wanted:
temperature change (ΔT) in kelvins (K)?
360 K
300
The temperature of a sample of BF3 is changed, causing a change in volume from 2482.3 mL to 5590 mL. If the starting temperature was 975.17 K, what is the final temperature in kelvins?
2200 K
400
Given:
• 6.78% beryllium
• 21.06% nitrogen
• 72.16% oxygen
What is the empirical formula?
BeN2O6
400
How much (in L) 0.20 M phosphoric acid is needed to react with 100 mL of 0.10 M sodium hydroxide?
0.017 L
400
Given values:
Liquid: water (H2O)
specific heat capacity of liquid (c1): 4.184 J/(g·K)
amount of liquid (m1): 889.2 g
initial temperature of liquid (T1): 319.7 K
Solid object placed in liquid: unknown
amount of solid (m2): 131.9 g
initial temperature of solid (T2): 2963.4 K
final temperature of system (Tf): 332.2 K
Wanted:
specific heat capacity of solid (c2) in joules per gram kelvin (J/(g·K))?
0.134 J/(g.K)
400
What mass of H2 is required to react with O2 to produce 912 mL of H2O (g) at 112 °C and 0.989 atm?
2 H2 (g) + O2 (g) --> 2 H2O (g)
0.057 g H2
500
Given: 484 g NO2
Wanted: liters at STP?
236 L
500
HCl + LiOH → LiCl + H2O
48.17 grams of LiOH are reacted with 485.21 grams of HCl, how many grams of LiCl will be produced?
85.27 g LiCl
500
50.0 g iron at 225oC is brought into contact with 50.0 g gold at 25.0oC. Assuming no heat is lost, what is the final temperature of both metals?
Specific heat: iron = 0.449 J/goC, gold = 0.128 J/goC
181oC
500
N2 + O2 → N2O4
23.9 liters of N2 are reacted with 230 grams of O2, 55.8 grams of N2O4 are produced at STP. What is the percent yield of this reaction?
56.8%