QS Flashcards
(23 cards)
Which of the following models does not correspond to the Thomson Model of Atom?
a. plum pudding model
b. watermelon model
c. raisin pudding model
d. nuclear model
d. nuclear model
Which sequences of elements are arranged in order of decreasing atomic radii?
a. Cl, Br, I
b. Li, Na, K
c. N, C, B
d. Al, Si, P
d. Al, Si, P
The strength of an atom’s attraction for the electrons in a chemical bond is the atom’s
.
a. Ionization Energy
b. Heat of reaction
c. Heat of Formation
d. Electronegativity
d. Electronegativity
Which of the following bonds are weakest in nature?
a. Single bond
b. Double bond
c. Triple bond
d. Hydrogen bond
d. Hydrogen bond
Which of these is an exception to the octet rule?
a. Expanded octet
b. Incomplete octet
c. Odd number octet
d. All of these
d. All of these
C2H5OH is the chemical formula for ethanol. Which of these two atom’s bonds in this compound is the least polar?
a. C-H
b. C-C
c. C-O
d. O-H
b. C-C
The ability of carbon to attract electrons is
a. greater than that of nitrogen, but less than that of oxygen
b. less than that of nitrogen, but greater than that of oxygen
c. greater than that of nitrogen and oxygen
d. less than that of nitrogen and oxygen
d. less than that of nitrogen and oxygen
Which sequence correctly places the elements in order of increasing ionization energy?
a. H → Li → Na → K
b. I → Br → Cl → F
c. O → S → Se → Te
d. H → Be → Al → Ga
b. I → Br → Cl → F
Which of the following statements correctly describes factors affecting solubility?
a. A nonpolar solute is more likely to dissolve in a polar solvent due to similar intermolecular forces.
b. Increasing the temperature generally decreases the solubility of a solid solute in a liquid solvent.
c. The solubility of a gas in a liquid increases with decreasing pressure.
d. The solubility of a liquid solute in a liquid solvent generally increases with increasing temperature.
d. The solubility of a liquid solute in a liquid solvent generally increases with increasing temperature.
Determine which of the following occurrences tells us what happens when Le Chatelier’s principle is applied (True or false).
1. The addition of a component causes the equilibrium to shift to the opposite side
2. The removal of a component causes the equilibrium to the side from which the component is removed
3. Increasing the temperature drives an exothermic reaction to the side of the reactants, an endothermic equilibrium to the side of the products
4. The addition of a catalyst has NO effect on the position of the equilibrium
b. T, T, T, T
If the temperature of a gas is increased while keeping the volume constant, what happens to the pressure?
a. It decreases.
b. It increases.
c. It is halved.
d. It became zero.
b. It increases.
What does the combined gas law express?
a. The relationship between pressure and volume at constant temperature.
b. The relationship between volume and temperature at constant pressure.
c. The relationship between pressure, volume, and temperature of a gas.
d. The relationship between pressure and temperature at constant volume.
c. The relationship between pressure, volume, and temperature of a gas.
There is an increase in temperature of an object then the kinetic energy of the object .
a. decreases
b. increases
c. remains the same
d. it is not related to the temperature
b. increases
Which of the following is not a postulate of Kinetic molecular theory of gases?
a. the actual volume of gas molecules is negligible
b. there are high forces of attraction between the gas molecules
c. collisions are elastic in gas molecules
d. kinetic energy of gas molecules is directly proportional to the absolute temperature
b. there are high forces of attraction between the gas molecules
Collisions of gas molecules are
a. perfectly elastic
b. inelastic
c. always occur in a proper and predicted motion
d. not conserved
a. perfectly elastic
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
a. Zero
b. Positive
c. Negative
d. None of the above
c. Negative
Which of the following statements is INCORRECT regarding a thermodynamic system?
a. The surface separating the system and its surroundings is known as the boundary.
b. Everything including the system is known as surroundings.
c. The system boundary may be movable or fixed.
d. An isolated system is a closed system that does not interact in any way with its surroundings.
b. Everything including the system is known as surroundings.
Representation of the different phase of a compound on a two- or three-dimensional graph is
a. Block diagram
b. Equilibrium diagram
c. Phase diagram
d. None of the mentioned
c. Phase diagram
The limitation(s) of Henry’s law is/are:
a. If gasses are placed under high pressure, it doesn’t work.
b. It is only applicable when the system molecules are in an equilibrium state.
c. Both A and B
d. None of the above
c. Both A and B
Determine the types of bonds that form between the following pairs of elements.
I. O2
II. KCl
III. HCl
a. I - non-polar covalent bond
II - ionic bond
III - polar covalent bond
b. I - polar covalent bond
II - ionic bond
III - non-polar covalent bond
c. I - ionic bond
II - polar covalent bond
III - non-polar covalent bond
d. I - ionic bond
II - polar covalent bond
III - polar covalent bond
a. I - non-polar covalent bond
II - ionic bond
III - polar covalent bond
Which of the following has the highest boiling point?
a. pentane
b. heptane
c. butane
d. ethane
b. heptane
Refer to the structure below. Determine the no. of primary, secondary, tertiary, and quaternary carbon.
a. 1° = 5, 2°= 2, 3°= 1, 4° = 1
b. 1° = 5, 2°= 1, 3°= 0, 4° = 1
c. 1° = 5, 2°= 2, 3°= 1, 4° = 0
d. 1° = 5, 2°= 1, 3°= 1, 4° = 1
d. 1° = 5, 2°= 1, 3°= 1, 4° = 1
