City and Islington College Equilibrium Problems David Martin City and Islington College To Print Students Name: …………………………………………………………………..

Topic Aims Method Equipment Duration Chemistry – Equilibria This worksheet provides some exercises to help teach the topic of equilibria Level Level 3 Method PowerPoint slides (hand-out) – ALL SLIDES to print out (apart from Slide 2) Answers are from slide 5 to 6 Work through the slides at the learners work through the hand-outs Equipment Laptop & Projector Hand-out Pens Duration >5-10 Minutes Hidden

Equilibrium Problems Equilibrium Reaction Problems Predict which direction the equilibrium reactions will move – answer left or right   1) Changing the pressure a) H2C=CH2 (g) + H2O (g) CH3CH2OH (g) - the pressure is doubled ____________________________________________________________________ b) 2CO (g) + O2 (g) 2CO2 (g) - the pressure is increased c) H2 (g) + I2 (g) 2HI (g) - the pressure is reduced d) N2O4 (g) 2NO2 (g) - the pressure is halved e) 3Fe (s) + 4H2O (g) Fe3O4 (s) + 4H2 (g) - the pressure is doubled To Print

Equilibrium Problems 2) Changing the temperature   a) N2 (g) + 3H2 (g) 2NH3 (g) ∆H = -92 KJmol-1 Raise the temperature from 650K to 720K. ____________________________________________________________________ b) Ag2CO3 (s) Ag2O (s) + CO2 (g) ∆H = +81.6 KJmol-1 Reduce the temperature from 450K to 400K. c) CaCO3 (s) CaO (s) + CO2 (g) ∆H = +177.8 KJmol-1 The temperature is reduced from 1200K to 1000K. d) H2 (g) + I2 (g) 2HI (g) ∆H = +2.9 KJmol-1 The temperature is increased from 500K to 700K. e) N2 (g) + O2 (g) 2NO (g) ∆H = -30.4 KJmol-1 The temperature is decreased from 1500K to 1100K. To Print

ANSWERS To Print

Equilibrium Problems Equilibrium Reaction Problems Predict which direction the equilibrium reactions will move – answer left or right   1) Changing the pressure a) H2C=CH2 (g) + H2O (g) CH3CH2OH (g) - the pressure is doubled A = Right the side with the least moles of gas b) 2CO (g) + O2 (g) 2CO2 (g) - the pressure is increased B = Right The side with the least moles of gas c) H2 (g) + I2 (g) 2HI (g) - the pressure is reduced C = no change moles of gas the same on both sides d) N2O4 (g) 2NO2 (g) - the pressure is halved D = Right the side with the most moles of gas e) 3Fe (s) + 4H2O (g) Fe3O4 (s) + 4H2 (g) - the pressure is doubled E = no change moles of gas the same on both sides To Print

Equilibrium Problems 2) Changing the temperature   a) N2 (g) + 3H2 (g) 2NH3 (g) ∆H = -92 KJmol-1 Raise the temperature from 650K to 720K. A = Left the endothermic direction b) Ag2CO3 (s) Ag2O (s) + CO2 (g) ∆H = +81.6 KJmol-1 Reduce the temperature from 450K to 400K. B = Left the exothermic direction c) CaCO3 (s) CaO (s) + CO2 (g) ∆H = +177.8 KJmol-1 The temperature is reduced from 1200K to 1000K. C = Left the exothermic direction d) H2 (g) + I2 (g) 2HI (g) ∆H = +2.9 KJmol-1 The temperature is increased from 500K to 700K. D = Right the endothermic direction e) N2 (g) + O2 (g) 2NO (g) ∆H = -30.4 KJmol-1 The temperature is decreased from 1500K to 1100K. E = Right the exothermic direction To Print

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