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CHEM1011-CHEM1031-CHEM1051-Chemistry 1A (T1 2025)
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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?
Given the following reaction:
CO (g) + 2H2(g) ⇌ CH3OH (g)In an experiment, 0.42 mol of CO and 0.42 mol of H2 were placed in a 1.00 L reaction vessel. At equilibrium, there were 0.29 mol of CO remaining. KC for the reaction is ________.
Consider the following equilibrium reaction:
H2CO3 (aq) ⇌ H+ (aq) + HCO3– (aq); K = 5.0 x 10–7
If the initial concentrations of the species are:
[H2CO3] = 0.010 M; [H+] = 1.2 x 10–5 M; [HCO3–] = 4.0 x 10–3 M
Which one of the statements below describes the relationship between Q and K and then the correct direction of chemical change?
Of the following equilibria, only ________ will shift to the right in response to a decrease in volume.
The magnitude of the equilibrium constant, K, for a given reaction depends on:
At elevated temperatures, molecular hydrogen and molecular bromine react to partially form hydrogen bromide:
H2 (g) + Br2 (g) ⇌ 2HBr (g)A mixture of 0.454 mol of H2 and 0.76 mol of Br2 is combined in a reaction vessel with a volume of 2.00 L. At equilibrium, there are 0.233 mol of H2 present. At equilibrium, there are ________ mol of Br2 present in the reaction vessel.
For the equilibrium reaction below K = 0.112.
SO2 (g) + ½O2 (g) ⇌ SO3 (g)
What is the value of K for the following reaction? 2SO2 (g) + O2 (g) ⇌ 2SO3 (g)