WorksheetsScience UIL Chemistry Questions District 2020
Total questions: 20
Worksheet time: 10mins
50 g of solid barium bromate is added to 2.0 L of water, and 31 g of the solid dissolves. If an additional 2.0 L of water is added to the solution, how much more barium bromate will dissolve?
0 g
9.5 g
19 g
31 g
50 g
For a 3.0 L sample of sulfur dioxide gas at 40.0oC and 1.5 atm pressure, how would you calculate the mass of SO2 in the sample?
mass = (0.082)(40)(64.07)/(3.0)(1.5)
mass = (0.082)(313)/(3.0)(1.5)(64.07)
mass = (3.0)(1.5)(64.07)/(8.314)(40)
mass = (3.0)(1.5)/(0.082)(40)(64.07)
mass = (64.07)(1.5)(3.0)/(313)(0.082)
What is the lowest whole-number coefficient on H2O in the balanced equation for the combustion of ethanol?
1
2
3
4
5
What kind of experiment is represented by the graph below?
Titration of a strong acid with a strong base.
Titration of a weak acid with a strong base.
Titration of a strong base with a strong acid.
Titration of a weak base with a strong acid.
Titration of a weak acid with a strong acid.
Which of these compounds in the liquid state would you expect to have the highest surface tension?
CH4
C3H6
C3H8
CH3OCH3
C2H5OH
Estimate the ΔH for this reaction using the bond energies provided on the data page.
-1248 kJ/mol
816 kJ/mol
-1594 kJ/mol
2309 kJ/mol
-2309 kJ/mol
What is the mass of three moles of sodium hydrogen phosphate dihydrate?
178.00 g
155.01 g
534.00 g
465.03 g
136.99 g
Which of the following is true when the reaction N2O4(g) ↔ 2NO2 (g)is at equilibrium?
The number of moles of NO2 is twice the number of moles of N2O4.
The concentrations of N2O4 and NO2 are equal.
The pressure of the N2O4 gas is twice the pressure of the NO2 gas.
The concentrations of N2O4 and NO2 are constant.
The rate of the forward reaction is double the rate of the reverse reaction.
What is the total mass of solute in 1.00 kg of solution that has a concentration of 7.5 ppm?
7.5 g
0.75 g
75 mg
7.5 mg
750 μg
Two aqueous reactants are mixed in a flask with a balloon over the top and the following change is observed.
What are the signs on q and w for the system?
q > 0, w > 0
q > 0, w < 0
q < 0, w > 0
q < 0, w < 0
q < 0, w = 0
Which of these acids at 0.075 M would have the lowest pH?
H2SO3
H2SO4
H3PO3
H3PO4
HNO3
What is the freezing point of the solution that results from adding 0.80 moles of BaCl2 to 4.0 L of water? Assume 1 L H20 = 1 kg.
0.37oC
-0.37oC
-1.9oC
-4.4oC
-1.1oC
What is the reducing agent in this reaction?
3HNO2(aq) + 5H+(aq) + Cr2O72-(aq) → 3NO3-(aq) + 2Cr3+(aq) +4H2O(l)
HNO2
H2O
Cr2O7-
NO3-
Cr3+
Which of these compounds is not likely to exist?
NaO
KBr
Sr3N2
ZnO
AgF
U.S. weather reports typically give the atmospheric pressure in units of inches of mercury, reported to two decimal places. High pressure usually means that the weather will likely remain the same, and low pressure indicates that the weather will soon change. What is 1 atm expressed in units of inches of mercury? (1 inch = 2.54 cm)
29.92" Hg
31.02" Hg
28.15" Hg
30.55" Hg
31.98" Hg
Using the data below, determine the rate law for this reaction:
rate = k [2AB][2C2]
rate = k [AB]2[C2]2
rate = k [AB]2[C2]
rate = k [AB][C2]2
rate = k [AB][C2]
Which of these could not be explained by the Rutherford model of the atom?
The gold foil experiment
Ionization of atoms
Atomic emission line spectra
Atoms of different elements having different masses
The electrical neutrality of atoms
Nitrogen and oxygen form four different binary gaseous compounds. For a given mass of oxygen, the ratio of the masses of nitrogen in any two of the compounds is a small whole number ratio:
This is an example of
Dalton's Law
The Law of Atomic Ratios
The Law of Molecular Masses
The Law of Definite Proportions
The Law of Multiple Proportions
Which bond type below best describes the type of bond formed between the Zn and N atoms in Zn(NH3)42+?
ionic bond
nonpolar covalent bond
polar covalent bond
coordinate covalent bond
hydrogen bond
In the year 2075 your granddaughter is doing her chemistry homework and asks you which atomic orbital comes after the 6g. What do you tell her?
7d
7f
5f
8s
In my day we didn't have g orbitals. And we were happy that way!
