| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.sl.TZ2.20 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Identify | Question number | 20 | Adapted from | N/A |
Question
Which statement is always correct for a chemical reaction at equilibrium?
A. The rate of the forward reaction equals the rate of the reverse reaction.
B. The amounts of reactants and products are equal.
C. The concentration of the reactants and products are constantly changing.
D. The forward reaction occurs to a greater extent than the reverse reaction.
Markscheme
A
Examiners report
[N/A]
Syllabus sections
Show 146 related questions
- 17N.2.sl.TZ0.5a: The following reaction was allowed to reach equilibrium at 761 K. H2 (g) + I2 (g)...
- 17N.1.sl.TZ0.18: What will happen if the pressure is increased in the following reaction mixture at...
- 17N.2.hl.TZ0.6a.i: State the equilibrium constant expression, Kc , for this reaction.
- 17N.1.hl.TZ0.19: The enthalpy change for the dissolution of NH4NO3 is +26 kJ mol–1 at 25 °C. Which statement...
- 17M.3.sl.TZ2.2b.ii: Suggest one improvement to the investigation.
- 17M.3.sl.TZ2.14b.ii: Describe how large amounts of CO2 could reduce the pH of the ocean using an equation to...
- 17M.3.sl.TZ2.1c.i: The equilibrium expression for O2 exchange between the atmosphere and ocean is O2(g)...
- 17M.2.sl.TZ2.3a.ii: Deduce, giving a reason, the factor responsible for establishing the new equilibrium after 14...
- 17M.2.sl.TZ2.3a.i: Deduce the equilibrium constant expression, Kc, for the decomposition of PCl5(g).
- 17M.1.hl.TZ2.22: Which variable affects the equilibrium constant, Kc? A. Atmospheric pressure B. ...
- 17M.1.sl.TZ2.18: What is the equilibrium constant expression, Kc, for the following reaction? 2NH3(g) +...
- 17M.3.sl.TZ1.20b: Explain the effect of a large amount of aspirin on the pH of blood.
- 17M.3.sl.TZ1.17c: Outline, giving the appropriate equation(s), how increasing levels of carbon dioxide...
- 17M.2.sl.TZ1.4c: Hydrazine reacts with water in a similar way to ammonia. Deduce an equation for the reaction...
- 17M.2.sl.TZ1.4b: Ammonia reacts reversibly with water. NH3(g) + H2O(l) \( \rightleftharpoons \) NH4+(aq) +...
- 17M.1.sl.TZ1.18: Consider the equilibrium between N2O4(g) and NO2(g). N2O4(g) \( \rightleftharpoons...
- 16N.3.sl.TZ0.1b: CT values are influenced by temperature and by pH. The table below shows the CT values for...
- 16N.2.sl.TZ0.1a: Ethane-1,2-diol can be formed according to the following reaction. 2CO (g) +...
- 16N.1.sl.TZ0.18: What happens when the temperature of the following equilibrium system is increased? CO(g) +...
- 16M.2.hl.TZ0.4a: (i) State why you would expect tin(II) chloride to have a similar lattice enthalpy to...
- 16M.2.hl.TZ0.2a: (i) Deduce the equilibrium constant expression, Kc, for this reaction. (ii) At exactly 600°C...
- 16M.2.sl.TZ0.3a: (i) Deduce the equilibrium constant expression, Kc, for this reaction. (ii) State the effect...
- 16M.1.sl.TZ0.18: What is the effect of...
- 15M.2.hl.TZ1.3c.i: The Contact process involves this homogeneous...
- 15M.2.hl.TZ1.3c.iii: The Contact process involves this homogeneous...
- 15M.2.hl.TZ1.3d: Outline the economic importance of using a catalyst in the Contact process.
- 15M.2.hl.TZ2.7a.i: Outline two characteristics of a reversible reaction in a state of dynamic equilibrium.
- 15M.2.hl.TZ2.7a.ii: Predict, with a reason, how each of the following changes affects the position of...
- 15M.2.hl.TZ2.7c: Typical conditions used in the Haber process are 500 °C and 200 atm, resulting in...
- 15M.2.hl.TZ2.7d.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction on page 10.
- 15M.1.sl.TZ1.20: Carbon monoxide and water react together in the industrial production of hydrogen...
- 15M.1.sl.TZ1.19: Which change will favour the reverse reaction in the...
- 15M.1.sl.TZ2.20: Which combination of temperature and pressure will give the greatest yield of sulfur...
- 15M.2.sl.TZ2.5b: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction.
- 15M.2.sl.TZ2.5e: Typical conditions used in the Haber process are 500 °C and 200 atm, resulting in...
- 15M.2.sl.TZ1.7d.i: Describe two characteristics of a reaction at equilibrium.
- 15M.2.sl.TZ1.7d.iii: State and explain the effect of a catalyst on the position of equilibrium.
- 15M.2.sl.TZ2.5a: Outline two characteristics of a reversible reaction in a state of dynamic equilibrium.
- 15M.2.sl.TZ2.5c: Predict, with a reason, how each of the following changes affects the position of...
- 14M.1.hl.TZ2.8: Which statements explain why a catalyst is used in the Contact process (shown...
- 14M.2.hl.TZ2.1d: Outline how you could establish that the system had reached equilibrium at the end of one week.
- 14M.2.hl.TZ1.7a: (i) Deduce the equilibrium constant expression for this reaction. (ii) Explain...
- 14M.2.hl.TZ2.1c.iv: Deduce the equilibrium constant expression for the reaction.
- 14M.2.hl.TZ2.5b.i: Chloric(I) acid is a weak acid, but hydrochloric acid is a strong acid. Outline how this is...
- 14M.2.hl.TZ2.1f: Outline how adding some ethyl ethanoate to the initial mixture would affect the amount of...
- 14M.2.hl.TZ2.5b.ii: State a balanced equation for the reaction of chloric(I) acid with water.
- 14M.2.hl.TZ2.5b.iii: Outline, in terms of the equilibrium in aqueous chlorine, why it is dangerous to use an...
- 14M.2.hl.TZ2.5b.iv: Suggest why a covalent molecule, such as chloric(I) acid, is readily soluble in water.
- 14M.2.hl.TZ2.8e: Magnesium hydroxide, \({\text{Mg(OH}}{{\text{)}}_{\text{2}}}\), is only sparingly soluble in...
- 15M.1.sl.TZ2.19: What is the equilibrium constant expression, \({K_{\text{c}}}\), for the formation of...
- 14M.1.sl.TZ1.19: Which statement is correct for a reversible reaction when \({K_{\text{c}}} \gg 1\)? A. ...
- 14M.1.sl.TZ1.20: Consider this reaction at equilibrium. ...
- 14M.1.sl.TZ2.19: What is the equilibrium constant expression, \({K_{\text{c}}}\), for this...
- 14M.2.sl.TZ1.3b: Explain the effect on the position of the equilibrium and on the value of \({K_{\text{c}}}\)...
- 14M.1.sl.TZ2.20: Which is always correct for a reaction at equilibrium?
- 14M.2.sl.TZ2.1f: Deduce the equilibrium constant expression for the reaction.
- 14M.2.sl.TZ2.1g: Outline how you could establish that the system had reached equilibrium at the end of one week.
- 14M.2.sl.TZ2.1i: Outline how adding some ethyl ethanoate to the initial mixture would affect the amount of...
- 14M.2.sl.TZ2.4c.i: Chloric(I) acid is a weak acid, but hydrochloric acid is a strong acid. Outline how this is...
- 14M.2.sl.TZ2.4c.ii: State a balanced equation for the reaction of chloric(I) acid with water.
- 14M.2.sl.TZ2.4c.iii: Outline, in terms of the equilibrium above, why it is dangerous to use an acidic toilet...
- 14M.2.sl.TZ2.4c.iv: Suggest why a covalent molecule, such as chloric(I) acid, is readily soluble in water.
- 14N.2.hl.TZ0.3c: (i) A sample of liquid bromine was left in a closed conical (Erlenmeyer) flask at 298 K...
- 14N.1.sl.TZ0.19: Which equilibrium reaction shifts to the product side when the temperature is increased at...
- 14N.1.sl.TZ0.20: Which statement correctly describes the effect of a catalyst on the equilibrium...
- 14N.2.sl.TZ0.5a: Deduce the extent of the reaction at 200 °C and 1 atm.
- 14N.2.sl.TZ0.5b: The Contact process operates at a temperature of 450 °C and a pressure of 2 atm as optimum...
- 14N.2.sl.TZ0.5c: An engineer at a Contact process plant hypothesized that using pure oxygen, instead of air,...
- 13N.1.hl.TZ0.23: Which of the following will shift the position of equilibrium to the right in the Haber...
- 13N.2.hl.TZ0.6b.ii: Considering the above equilibrium, predict, giving a reason, how adding more acid would...
- 13N.1.sl.TZ0.20: What happens to the position of equilibrium and the value of \({K_{\text{c}}}\) in the...
- 13N.1.sl.TZ0.19: What is the equilibrium constant expression, \({K_{\text{c}}}\), for the following...
- 13N.2.sl.TZ0.5a.ii: Considering the above equilibrium, predict, giving a reason, how adding more acid would...
- 13M.1.sl.TZ1.20: Which changes occur when the temperature is decreased in the following...
- 13M.1.sl.TZ1.19: The value of the equilibrium constant, \({K_{\text{c}}}\), for a reaction is...
- 13M.2.sl.TZ1.7c.i: Outline the characteristics of a chemical equilibrium.
- 13M.2.sl.TZ1.7c.ii: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for this reaction.
- 13M.2.sl.TZ1.7d.i: Increase in temperature.
- 13M.2.sl.TZ1.7d.ii: Increase in pressure.
- 13M.2.sl.TZ1.7d.iii: Addition of a catalyst.
- 13M.2.hl.TZ2.4a.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the formation of HI(g).
- 13M.1.sl.TZ2.19: Which statement is correct when the system is at equilibrium at 350 °C? A. The...
- 13M.1.sl.TZ2.20: Which statement describes and explains the conditions that favour the formation of hydrogen...
- 12N.2.sl.TZ0.3b: (i) Deduce the equilibrium constant expression, \({K_{\text{c}}}\). (ii) Predict how...
- 12N.1.sl.TZ0.19: Consider the following reaction: \({\text{2A}} \rightleftharpoons {\text{C}}\) ...
- 12N.1.sl.TZ0.20: Iron(III) ions, \({\text{F}}{{\text{e}}^{3 + }}\), react with thiocyanate ions,...
- 12N.2.sl.TZ0.3a: A glass container is half-filled with liquid bromine and then sealed. The system eventually...
- 10N.1.hl.TZ0.22: What is the effect of an increase of temperature on the yield and the equilibrium constant...
- 10N.2.hl.TZ0.6a: (i) Use the graph to deduce whether the forward reaction is exothermic or endothermic and...
- 10N.1.sl.TZ0.20: The formation of nitric acid, \({\text{HN}}{{\text{O}}_{\text{3}}}{\text{(aq)}}\), from...
- 10N.1.sl.TZ0.19: What is the equilibrium constant expression for the reaction...
- 10N.2.sl.TZ0.6a: (i) Use the graph to deduce whether the forward reaction is exothermic or endothermic and...
- 09N.2.hl.TZ0.6e.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction.
- 09N.2.hl.TZ0.6e.iii: If the temperature of the reaction is changed to 300 °C, predict, stating a reason in each...
- 09N.2.hl.TZ0.6e.v: Suggest, stating a reason, how the addition of a catalyst at constant pressure and...
- 09N.2.hl.TZ0.6a.iii: 1.0 mol of \({\rm{C}}{{\rm{l}}_2}\) and 1.0 mol of NO are mixed in a closed container at...
- 09N.2.hl.TZ0.6e.iv: If the volume of the container is changed to \({\text{1.50 d}}{{\text{m}}^{\text{3}}}\),...
- 09N.1.sl.TZ0.20: An increase in temperature increases the amount of chlorine present in the following...
- 09N.1.sl.TZ0.21: What will happen when at a constant temperature, more iodide ions, \({{\text{I}}^ - }\), are...
- 09N.2.sl.TZ0.5a.ii: If the temperature of the reaction is changed to 300 °C, predict, stating a reason in each...
- 09N.2.sl.TZ0.5a.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction.
- 09N.2.sl.TZ0.5a.iv: Suggest, stating a reason, how the addition of a catalyst at constant pressure and...
- 09N.2.sl.TZ0.5a.iii: If the volume of the container is changed to \({\text{1.50 d}}{{\text{m}}^{\text{3}}}\),...
- 10M.2.sl.TZ1.5d: (i) A state of equilibrium can exist when a piece of copper metal is placed in a solution...
- 10M.2.hl.TZ2.6f.iii: Outline the economic significance of the use of a catalyst in the Haber process which is an...
- 10M.2.hl.TZ2.7a: (i) State the expression for the ionic product constant of water,...
- 10M.1.sl.TZ2.21: Consider the endothermic reaction...
- 10M.2.sl.TZ2.6b: In carbonated drinks containing dissolved carbon dioxide under high pressure, the following...
- 10M.2.sl.TZ2.6a: (i) State the equilibrium constant expression for the dissociation of water. (ii) ...
- 10M.1.sl.TZ2.20: What is the equilibrium constant expression, \({K_{\text{c}}}\), for the following...
- 09M.1.hl.TZ1.24: Consider the following reversible...
- 09M.2.sl.TZ1.1c.i: State what is meant by the term dynamic equilibrium.
- 09M.2.sl.TZ1.1c.ii: Using the abbreviations [vegetable oil], [methanol], [glycerol] and [biodiesel] deduce the...
- 09M.1.sl.TZ1.21: Consider the following equilibrium...
- 09M.2.sl.TZ1.1c.iii: Suggest a reason why excess methanol is used in this process.
- 09M.2.sl.TZ1.1c.iv: State and explain the effect that the addition of the sodium hydroxide catalyst will have on...
- 09M.1.hl.TZ2.24: Which statement is correct for the equilibrium...
- 09M.2.hl.TZ2.6a.ii: State and explain the effect of increasing the pressure on the yield of sulfur trioxide.
- 09M.2.hl.TZ2.6a.iv: State the effects of a catalyst on the forward and reverse reactions, on the position of...
- 09M.2.sl.TZ2.5a.iv: State and explain the effect of a catalyst on the position of equilibrium.
- 09M.1.sl.TZ2.19: What effect will an increase in temperature have on the \({K_{\text{c}}}\) value and the...
- 09M.2.sl.TZ2.5a.ii: State and explain the effect of increasing the temperature on the yield of sulfur trioxide.
- 09M.2.sl.TZ2.5a.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction.
- 09M.2.sl.TZ2.5a.iii: State the effect of a catalyst on the value of \({K_{\text{c}}}\).
- 11M.2.hl.TZ1.8b.i: Describe how an indicator works.
- 11M.2.hl.TZ1.8b.ii: Using Table 16 of the Data Booklet, identify the most appropriate indicator for the titration...
- 11M.1.sl.TZ1.18: Consider the reaction between gaseous iodine and gaseous...
- 11M.1.sl.TZ1.19: The equilibrium between nitrogen dioxide, \({\text{N}}{{\text{O}}_{\text{2}}}\), and...
- 11M.1.sl.TZ1.20: Which statement about chemical equilibria implies they are dynamic? A. The position of...
- 11M.2.sl.TZ1.3b.i: increasing the temperature of the reaction at constant pressure.
- 11M.2.sl.TZ1.3a: State the equilibrium constant expression, \({K_{\text{c}}}\), for the production of methanol.
- 11M.2.sl.TZ1.3c: The conditions used in industry during the production of methanol are a temperature of 450 °C...
- 11M.2.sl.TZ1.3b.ii: increasing the pressure of the reaction at constant temperature.
- 11M.1.sl.TZ2.18: For the following reaction \({K_{\text{c}}} = 1.0 \times {10^{ - 5}}\) at 30...
- 11M.1.sl.TZ2.19: The reaction below represents the Haber process for the industrial production of...
- 11M.2.sl.TZ2.6a.iii: Predict what would happen to the position of equilibrium and the value of \({K_{\text{c}}}\)...
- 11M.2.sl.TZ2.6a.iv: The value of \({K_{\text{c}}}\) at 500 K is 160 and the value of \({K_{\text{c}}}\) at 700 K...
- 11M.2.sl.TZ2.6a.v: The reaction can be catalysed by adding platinum metal. State and explain what effect the...
- 11M.2.sl.TZ2.6a.i: Outline the characteristics of a homogeneous chemical system that is in a state of equilibrium.
- 11M.2.sl.TZ2.6a.ii: Deduce the expression for the equilibrium constant, \({K_{\text{c}}}\).
- 12M.1.sl.TZ2.19: What is the equilibrium constant expression, \({K_{\text{c}}}\), for the following...
- 12M.1.sl.TZ2.20: What happens to the position of equilibrium and the value of \({K_{\text{c}}}\) when the...
- 11N.1.sl.TZ0.20: The following are \({K_{\text{c}}}\) values for a reaction, with the same starting conditions...
- 11N.1.sl.TZ0.19: Which are characteristics of a dynamic equilibrium? I. Amounts of products and reactants...
- 11N.2.sl.TZ0.6a.i: Deduce the equilibrium constant expression, \({K_{\text{c}}}\), for the reaction.
- 11N.2.sl.TZ0.6a.ii: Predict the direction in which the equilibrium will shift when the following changes...
