Which of the following gases has the greatest volume at 0 C and 760 mmHg?
a)CH4
b)Cl2
c)Ar
d)Xe
e)all the same
What is e) all the same
100
Which of the following gases has the lowest KE at a temperature at 85C?
a) N2
b)O2
c)Ar
d)NH3
e) all have the same KE
What is E
100
Chlorine is a gas, bromine is a liquid, and iodine is a solid because:
a)They have different intermolecular forces
b)Their bonds have different polarities
c)The strengths of the dipole-dipole interactions differ in each compound.
d)None of these
What is D
100
What is the molarity (M) of a solution that has 2.5 mols in 900 mL?
What is 2.78
100
If Q < K then the reaction is proceeding in the ______ direction
If Q > K then the reaction is proceeding in the _______ direction
What is forward; reverse
200
What are STP condition, what volume does 1 mol of gas occupy at STP?
What is 0 C, 273K, 1mol, 1 atm 22.4L
200
A mixture of Ar, CH4, H2, CO2, and PCl5 is released in the back of the classroom. Which gas reaches the front of the classroom first and why?
What is H2
200
Which of the following is the least strong?
a)polar covalent bond
b)ionic bond
c)hydrogen bond
d)dipole-dipole force
What is D
200
What is the molality (m) of a solution that uses 6.9 mols of the solute in 1850 Kg of the solvent?
What is 3.7* 10 ^-3
200
When writing K eq expression _______ goes in the numerator and _________ goes in the denominator.
What is products and reactants.
300
At 23C a sample of gas occupies 380mL at P= 1.23 atm. What will the volume be at P=0.800 atm?
What is 584.25 mL
300
In an endothermic reaction,
a)Energy is transferred from the system to the surroundings
b)Energy is transferred from the surroundings to the system
c)q sys >0
d)q sys <0
e)both b&c
f)both a&d
What is E
300
What causes dipole-dipole interactions?
a)sharing of electron pairs
b)bonding of a covalently-bonded hydrogen to an lone electron pair
c)the random motion of electrons
d)none of these
What is D - caused by attraction of partial + and partial - on two different atoms
300
What is the percentage concentration of 70 g of NaCL dissolved in 350 g of water?
What is 16.67 %
300
H2CO3(aq) + H2O(ℓ) --> HCO3−(aq) + H3O+(aq)
What is the eq expression for this reaction.
What is K= [HCO3-][ H3O+]/ [H2CO3]
400
If you have 16.7g Cl2 in a 2.34L vessel at -20C, what is the pressure?
What is 2.09 atm.
400
If we place a gas in a 630 mL container at a pressure of 469 mmHg at a temperature of 33oC, what is the molar mass of this gas? (The mass of the gas is 3.62 g)
What is 234.12 g/mol
400
Which statement is correct?
a) molecular compounds have high melting and boiling points while iconic compounds have low melting points and boiling points
b) Intermolecular forces are those that hold atoms together in a bond
c) For ions having the the same charge, the larger the ion, the greater its ion - dipole forces.
d) most molecular compounds are soluble in water
e) the process of liquid water changing to ice when cooled at 0 C is called fusion
What is C
400
If 27.9 g of a solute of molar mass 42.39 g/mol is dissolved in 175g H2O, what is the weight percent of the solute in the solution?
What is 13.8 %
400
Which of the following statements is true in a reaction system at equilibrium?
a)The number of collisions per unit time between reactants is equal to the number of collisions per unit time
between products.
b)Reactants are reacting to form products at the same rate as products are reacting to form reactants.
c)The product of the concentrations of the reactants is equal to the product of the concentrations of the products.
d)All concentrations of reactants and products are the same.
e)No products are being formed, and no reactants are being formed.
What is B
500
What is the effect on the volume with the following changes?
a) a decrease in pressure at constant temperature
b) an increase in temperature at constant pressure
What is both increase
500
If we want to raise the temperature of 70g of cobalt from 13.0 ℃ to 57.3℃ how much energy must be added? (Specific heat of cobalt is 0.42 J/ g K).
What is 1302.42 J
500
The order of boiling points for the hydrogen halides HCL thru HI is HCL
What is A
500
Suppose we dissolve 14.0 g of a wax (MM = 267 g/mol) in 36 g of diethyl ether( MM = 74.12 g/mol) and P1o = 80 mm Hg at 37oC). Solve for the vapor pressure of the solution.
What is 72 mmHg
500
What is the name of the most amazing college football team in the SEC?