Nuclear
Q. Which nuclear particle determines the identity of an element?
Answer: Proton
Q. Kc = 1. Which side is favored?
Answer: Neither; neither side is favored significantly.
Q. Which of the following substances is water soluble?
A) Ethanol
B) Dichloromethane
C) Chloroform
D) Benzene
Answer: A) Ethanol
Q. Which of the following elements is found in Period 3 and main Group 5A?
A) Phosphorus
B) Silicon
C) Nitrogen
D) Arsenic
Answer: B) phosphorus
Q. Name the elements in the following reaction that have been oxidized and reduced, respectively:
Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)
Answer: Oxidized: zinc; Reduced: copper
Q. What happens to the neutron-to-proton ratio during beta-minus decay?
Answer: It decreases
Q. Which system has equilibrium most sensitive to pressure changes?
A) Equal gas moles on both sides
B) Large difference in gas moles
C) No gases present
D) Only solids involved
Answer: B) Large difference in gas moles
Q.A hydrocarbon does not react with bromine water and shows no evidence of π bonds in its IR spectrum.
Which class of hydrocarbons does it most likely belong to?
A) Alkene
B) Alkyne
C) Alkane
D) Aromatic hydrocarbon
Answer: C) Alkanes
Q. Molten cryolite is used in what industrial process? (NAME OF PROCESS)
Answer: Hall–Héroult process
Q. What is the oxidation number of the sulfur atom in H₂SO₄?
Answer: +6
Q. Which force overcomes proton–proton repulsion inside the nucleus?
Answer: Strong nuclear force
Q. Which of the following is NOT generally true of reaction equilibria:
A) If the temperature of an exothermic reaction is raised, the equilibrium shifts to the left.
B) The equilibrium constants for forward and reverse reactions are the reciprocals of each other.
C) Pure liquids appear in the equilibrium expression but pure solids do not.
D) An equilibrium constant greater than 1 means that the reaction favors products at equilibrium.
C) pure liquids appear in the equilibrium expression but pure solids do not
Q. Which compound is aromatic?
A) Cyclohexane
B) Benzene
C) Hexene
D) Ethyne
Answer: B) Benzene
Q. Which of the following best describes the catalyst in the destruction of ozone by chlorofluorocarbons?
A) Homogeneous
B) Heterogeneous
C) Enzymatic
D) Autocatalytic
Answer: A) homogeneous
Q. If you were looking to purchase magnesium sulfate, which of the following would you be correct in buying?
A) Alum
B) Cream of tartar
C) Soda ash
D) Epsom salt
Answer: D) Epsom salt
Q. Who discovered the neutron?
Answer: James Chadwick
Q. Which equilibrium constant is dimensionless?
A) Kc only
B) Kp only
C) Both Kc and Kp D) Neither
Answer: C) Both Kc and Kp
Q. Which of the following substances has the greatest density?
A) Hexane
B) Methylene chloride
C) Diethyl ether
D) Ethyl acetate
Answer: B) Methylene chloride
Q. Which of the following is a metallic element, composes about 5% of the Earth’s crust, oxidizes very easily, and when pure is a dark, silver-grey metal?
A) Cobalt
B) Nickel
C) Iron
D) Titanium
Answer: Y) iron
Q. What is the chemical name for the compound formed when pure iron and pure sulfur are mixed together and heated?
Answer: Iron sulfide
Q. Who discovered radioactivity?
Answer: Henri Becquerel
Q. For the following processes, predict whether ΔS° is positive or negative:
1. Decomposition of ammonium nitrate
2. Sublimation of dry ice
3. Condensation of gaseous iodine to liquid iodine
positive, positive, negative
Q. A ketone is a class of compounds that contains a carbonyl group bonded to:
A) 2 carbon atoms
B) 2 hydrogen atoms C) 2 nitrogen atoms
D) 1 hydrogen and 1 carbon atom
Answer: A) 2 carbon atoms
Q. Which of the following statements is NOT true regarding alloys?
A) Alloys are generally more brittle than the metals from which they are made.
B) Alloys are generally harder than the metals from which they are made.
C) Alloys are generally better electric conductors than the metals from which they are made.
D) Alloys are generally worse thermal conductors than the metals from which they are made.
Answer: C) Alloys are generally better electric conductors than the metals from which they are made
Q. What is the only alkali metal that forms a stable nitride at room temperature and standard pressure?
Answer: Lithium