CHEM1011-CHEM1031-CHEM1051-Chemistry 1A (T1 2025)
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What is the pH of a buffer solution containing 1.02 mol/L acetic acid and 1.21 mol/L sodium acetate?
pKa acetic acid = 4.76
This graph shows measurements of the absorbance of light for solutions containing different concentrations of Fe3+. Select the one statement below which best describes the graph.
Of the following equilibria, only ________ will shift to the left in response to a decrease in volume.
Nitrosyl bromide decomposes according to the following equation:2NOBr (g) ⇌ 2NO (g) + Br2 (g) A sample of NOBr (0.729 mol) was placed in an empty 1.00 L flask. At equilibrium the flask contained 0.154 mol of NOBr. How many moles of Br2 are in the flask at equilibrium?
How is the reaction quotient used to determine whether a system is at equilibrium?
For the equilibrium below, K = 0.112 at 700.0 °C.
SO2 (g) + ½O2 (g) ⇌ SO3 (g)What is the value of K at this temperature for the following reaction? 2SO3 (g) ⇌ 2SO2 (g) + O2 (g)
Consider a chemical reaction that is proceeding in the forward direction. Which one statement about the change in concentration of products and reactants over time is true?
Consider the following exothermic reaction at equilibrium:
2CO2 (g) ⇌ 2CO (g) + O2 (g)Le Châtelier's principle predicts that an increase in temperature at constant pressure will ________.
Consider the following chemical reaction, for which K = 305.
H2 (g) + I2 (g) ⇌ 2HI (g)
What would be the effect on K if the reactant concentrations are doubled?
Nitrosyl bromide decomposes according to the following equation:2NOBr (g) ⇌ 2NO (g) + Br2 (g) A sample of NOBr (0.655 mol) was placed in an empty 1.00 L flask. At equilibrium the flask contained 0.109 mol of NOBr. How many moles of NO are in the flask at equilibrium?
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