Exam 1&2
if an object travels 4 feet/day, how far does it travel in cm/seconds. If 1in=2.54cm
.00141cm/s
The sum of heat for a system is equal to the negative sum of heat for its surroundings is known as what?
Enthalpy
Pressure rises at the _____ of a gas increases because gas molecules collide more frequently and energetically.
Temperature
What is the value for the R constant?
0.08206 (atm)(L)/(mol)(K)
name Avogadro's law?
V1/n1=V2/n2
What is the compound iron (iii) oxide?
Fe2O3
A--> 2B H=456.7 kJ/mol
A--> C H=-22.1 kJ/mol
What is the enthalpy change in 2B--> C
-478.8 kJ/mol
a gas will behave most similar to an ideal gas at which temperature and pressure?
0C or 273 Kelvin at 1atm
convert 340 mmHg to atm
0.447atm (divide by 760, same rule with torr)
The enthalpy chnage accompaying the reaction of .95g of S is how many kJ?
2S+ 3O2 --> 2SO3 H=-790kJ
-11.7 kJ
What is the net ionic equation of
MgCL2(aq) + AgNO3(aq)--> Mg(NO3)2(aq) +AgCl(s)
Ag+(aq) +Cl-(aq) --> AgCl2 (s)
freebie
freebie
What is Charles's law?
V/T=R
If I have an unknown quantity of oxygen gas at a pressure of 880 mmHg, a volume of 41 liters, and a temperature of 67 0C, how many moles of gas do I have? Grams of gas?
mol= 1.7 gO2=54.45
If 13M Na2O in a 4L solution, was diluted in 430mL of solution, what would be the new solution's molarity?
36.36M
3 AgNO3 + AlCl3 --> Al(NO3)3 +3 AgCl
what mass in grams of AgCl is produced when 4.22g of AgNO3 react with 7.73g AlCl3?
AgNO3= 169.88g/mol
AlCl3 =133.33 g/mol
3.56g AlCl
given the data table below calculate the change in heat for the reaction 3Cl2 + PH3 -->PCL3 + 3HCl
PCl3--> -288.07
HCl--> -92.3
PH3--> 5.4
-570.37kJ
Rank the following in order from highest to lowest rate of effusion: F2=30g/mol SF6=146g/mol
Ne=20.2g/mol 83.8g/mol
Ne>F2>Kr>SF6
a baloon contains .76mol N2, 0.18mol O2, 0.031mol He, and 0.026 mol h2 at a total pressure of 739mmHg. What is the partial pressure of O2?
130mmHg
the breaking of bonds in a reaction absorbs or releases heat?
releases
what is the molarity of a 10.9g KCl dissolved in 150.0 mL of water? (molar mass KCl= 74.55 g/mol)
0.975M
determine the change in heat for the following:
2NO+ O2--> 2NO2 H=?kJ
If N2+O2--> 2NO H= 457 kJ
1/2 N2+ O2--> NO2 H=337890 J
218.78 kJ
Boyle's law states that as the volume of a gas increases, pressure will what?
decrease
A balloon is filled with helium gas at 20 degrees C. Occupying 5.91L at 1.00atm. The balloon was put into liquid nitrogen at -196 degrees C, while the pressure is raised to 5.2 atm. What is the volume of the balloon in liquid nitrogen?
120L
If a sample of chloroform is initially 25 degrees celsius, what is the final temperature if 150g of chloroform absorbs 1kJ of heat? The specific heat of chloroform is .96J/C
31.94 degrees Celsius