Search
Info
Warning
Danger

Study Resources (Chemistry)

14.1   Multiple-Choice Questions 1) An Arrhenius acid is best defined as a A) hydroxide donor. B) proton acceptor. C) substance that dissociates in water to produce aqueous hydrogen ions. D) substance that dissociates in water to produce aqueous hydroxide ions. 2) When dissolved in water, which of the following compounds is an Arrhenius acid? A) HCN B) NaOH C).
4 Views
View Answer
11.3   Short Answer Questions 1) In a solution that is 55% ethyl alcohol and 45% water, the solute is ________ and the solvent is ________. 2) According to the rule of thumb "like dissolves like." ionic solids like NaCl or polar substances like glucose are more soluble in ________ solvents, whereas nonpolar.
1 Views
View Answer
111) Biological reactions are catalyzed by A) carbohydrates. B) enzymes. C) lipids. D) steroids. Shown is a concentration versus time plot for a reaction involving gases A, B, and C.   112) Which equation best represents the reaction? A) 4A(g) → B(g) + 2C(g) B) 4A(g) + B(g) → 2C(g) C) 2C(g) → 4A(g) + B(g) D) 2C(g) +.
0 Views
View Answer
13.1   Multiple-Choice Questions 1) Which one of the following statements does not describe the equilibrium state? A) Equilibrium is dynamic and there is no net conversion to reactants and products. B) The concentration of the reactants is equal to the concentration of the products. C) The concentration of the reactants and products reach a.
3 Views
View Answer
Consider a reaction that occurs by the following one-step mechanism: A2 + B2 → 2 AB The potential energy profile for this reaction is shown below.     151) What is the species present at reaction stage 1? A) an intermediate B) a product C) a reactant D) a transition state 152) What is the species present at reaction.
0 Views
View Answer
101) The first-order isomerization reaction: cyclopropane → propene, has a rate constant of 1.10 × 10-4s-1 at 470°C and 5.70 × 10-4s-1 at 500°C. What is the activation energy, Ea, for the reaction? A) 46 kJ/mol B) 110 kJ/mol C) 260 kJ/mol D) 380 kJ/mol 102) The first-order isomerization reaction: cyclopropane → propene, has a.
0 Views
View Answer
Picture (1) represents the equilibrium mixture for the reaction A + B ? 2 AB at 298 K.     121) If this reaction is exothermic, which picture (2)-(4) represents the equilibrium mixture at 400 K? A) picture (2) B) picture (3) C) picture (4) D) None of these 122) If this reaction is endothermic, which picture.
0 Views
View Answer
61) Ammonium carbamate can dissociate into gases at 25°C according to the reaction: NH2COONH4(s) ? 2 NH3(g) + CO2(g) If sufficient ammonium carbamate is sealed in a flask, the total pressure will be 0.117 atm at equilibrium. What is the value of Kp at 25°C? A) 2.37 × 10-4 B) 2.00 × 10-4 C) 1.60.
0 Views
View Answer
12.1   Multiple-Choice Questions 1) Which term describes the measure of the increase in the concentration of a product per unit time? A) activation energy B) kinetics C) reaction rate D) reaction time 2) "Instantaneous rate" is defined as the A) change in concentration per unit time. B) equation showing how the rate depends on the concentration of each.
3 Views
View Answer
71) Which of the following changes in reaction conditions will alter the composition of an equilibrium mixture of gases for a reaction having unequal moles of gaseous products and gaseous reactants? A) addition of reactants or products B) decreasing the pressure or volume C) increasing the temperature D) All of these will alter the.
0 Views
View Answer
13.3   Short Answer Questions 1) A reaction in which reactants form products in the forward reaction and products simultaneously form reactants in the reverse reaction is said to be ________. 2) In a reversible reaction, when the rate of the forward reaction equals the rate of the reverse reaction, the reaction is.
0 Views
View Answer
21) From the following chemical reactions determine the relative Br∅nsted-Lowry acid strengths (strongest to weakest). HCl(aq) + H2O(l) → H3O+(aq) + Cl-(aq) HCN(aq) + H2O(l) ? H3O+(aq) + CN-(aq) A) HCl > HCN > H3O+ B) HCl > H3O+ > HCN C) H3O+ > HCl > HCN D) HCN > H3O+ > HCl 22) From the following.
0 Views
View Answer
12.2   Algorithmic Questions 1) The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below. If the rate of appearance of Cr2(SO4)3 is  1.64 mol/min at a particular moment, what is the rate of disappearance of C2H6O at that moment? A).
0 Views
View Answer
91) A catalyst increases the rate of a chemical reaction by providing a lower-energy mechanism for the reaction. When this occurs, which one of the following is not affected? A) activation energy for the forward reaction B) activation energy for the reverse reaction C) equilibrium constant D) rate of the reverse reaction 92) A reaction.
0 Views
View Answer
81) The percent dissociation of acetic acid changes as the concentration of the acid decreases. A 100-fold decrease in acetic acid concentration results in a ________ fold ________ in the percent dissociation. A) 10, increase B) 10, decrease C) 100, increase D) 100, decrease 82) Which of the following are weak diprotic acids? A) carbonic acid.
0 Views
View Answer
81) Which of the following statements are true about reaction mechanisms? I.A rate law can be written from the molecularity of the slowest elementary step. II.The final rate law can include intermediates. III.The rate of the reaction is dependent on the fastest step in the mechanism. IV.A mechanism can never be proven to be.
0 Views
View Answer
11) What are the conjugate acid-base pairs in the following chemical reaction? NH3(aq) + H2O(l) ? NH4+(aq) + OH-(aq) A) NH3, H2O and NH4+, OH- B) NH3, NH4+ and H2O, OH- C) NH3, OH- and H2O, NH4+ D) NH3 and NH4+ 12) Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion,.
1 Views
View Answer