Multiple Choice
|
|
|
1.
|
It has been shown experimentally that a beam of electrons can be
diffracted. This is evidence that electrons
A) | are lighter than protons | B) | have wave properties | C) | have particle
properties | D) | are negative |
|
|
|
2.
|
Which of the following statements is NOT true?
A) | The Heisenberg uncertainty principle states that it is impossible to determine
accurately both the position and velocity of an electron. | B) | Rutherford’s
alpha particle scattering experiment demonstrated that most of the mass of an atom is in a small
dense nucleus. | C) | The solution of Schrodinger’s wave equation permits you to predict the exact
location and momentum of a hydrogen atom’s electron at any time. | D) | de Broglie reasoned
that matter could have both wave and particle properties. |
|
|
|
3.
|
Which of the following statements concerning the reaction is correct?
Assume constant pressure.
2 SO3 (g) + 198 kJ ® 2 SO2 (g) + O2 (g)
A) | The enthalpy of products exceeds that of the reactants | B) | The reaction is
exothermic | C) | The sign of DH for the
reaction is negative | D) | The enthalpy of reactants exceeds that of the
products |
|
|
|
4.
|
A chemical system produces 155 kJ of heat and does 22 kJ of work. What is
DE for the surroundings?
A) | 177 kJ | B) | -133 kJ | C) | 133
kJ | D) | -177 kJ |
|
|
|
5.
|
Calculate the frequency of an electron travelling at 1.85x107 m/s.
(mass of electron = 9.11x10-28 g)
A) | 1.31x10-19 s-1 | B) | 1.18x10-2
s-1 | C) | 7.63x1018 s-1 | D) | 3.93x10-11
s-1 |
|
|
|
6.
|
When a 3.80 g sample of liquid octane (C8H18) is burned in
a bomb calorimeter, the temperature of the calorimeter rises by 27.3 °C. Determine the
DH for this reaction in kJ/mol octane. (Heat capacity of the
calorimeter is 6.18 kJ/°C)
A) | -16.7x103 kJ/mol | B) | 5.07x103 kJ/mol | C) | -5.07x103
kJ/mol | D) | -44.4x103 kJ/mol |
|
|
|
7.
|
How much energy (in J) is contained in 1.00 mol of 552 nm photons?
A) | 3.60x10-19 J | B) | 2.17x105 J | C) | 5.98x10-43 J | D) | 3.60x10-28
J |
|
|
|
8.
|
If the same amount of heat is added to 50 g or each metal shown below, which
will attain the highest temperature?
A) | chromium (0.447 J/g °C) | B) | cobalt (0.418 J/g
°C) | C) | gold (0.129 J/g °C) | D) | copper (0.385 J/g °C) |
|
|
|
9.
|
Blue light has a _________ frequency and a __________wavelength than red
light.
A) | lower, longer | B) | higher, longer | C) | higher,
shorter | D) | lower, shorter |
|
|
|
10.
|
The angular momentum quantum number (l) is best associated with the
A) | number of orbitals in a sub-level. | B) | orientation in space of an
orbital | C) | energy of the orbital. | D) | shape of an
orbital. |
|
|
|
11.
|
Hydrogen gas reacts with oxygen to form water. 2 H2 (g) + O2 (g) ® 2 H2O
(g) DH = ???
In one experiment 1.888 g of hydrogen react to form 226.4
kJ of heat. Based on this information, calculate the enthalpy for the reaction as written
above. A) | -241.7 kJ | B) | +241.7 kJ | C) | -483.5
kJ | D) | -212.0 kJ |
|
|
|
12.
|
Which of the following combination of quantum numbers is allowed?
A) | n =3; l =2; ml = +3; ms= +1/2 | B) | n =3; l =3; ml
= +1; ms= –1/2 | C) | n =4; l =3; ml = 0; ms=
-1/2 | D) | n =3; l =2; ml = –1; ms=
–1 |
|
|
|
13.
|
Which of the following correctly lists the electromagnetic waves in order of
decreasing energy?
A) | microwaves > ultraviolet > infrared > x-rays | B) | microwaves >
infrared > ultraviolet > x-rays | C) | x-rays > microwaves > infrared >
ultraviolet | D) | x-rays > ultraviolet > infrared > microwaves |
|
|
|
14.
|
All the following statements are TRUE, except
A) | heat flows from the system into the surroundings in an exothermic
process. | B) | heat flows from the system into the surroundings in an endothermic
process. | C) | the value of q is positive in an endothermic process | D) | the value of q is
positive when heat flows into the system from the surroundings. |
|
|
|
15.
|
What is the wavelength of the radiation emitted when an electron undergoes a
transition from n = 5 to n = 3?
A) | 1282 nm | B) | 384.6 nm | C) | 683.8
nm | D) | 205.1 nm |
|