BAED-CHEM2122 General Chemistry 2
PREVIEW:
If 25 J are required to change the temperature of 5.0 g of substance A by 2.0°C, what is the specific heat of substance A? 2.5 J/g C Which phase of matter has the greatest motion and least orderly arrangement? GAS For which of these processes is the value of ΔH expected to be positive? 1. The temperature increases when calcium chloride dissolves in water. 2. Steam condenses to liquid water 3. Water boils 4. Dry ice sublimates 3 and 4 only True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction. True The formation ½A2+2B2+C→CAB4½A2+2B2+C→CAB4 has an enthalpy of formation of -104 kJ and a change in entropy of -60.8 J/K at 30 °C. What is the free energy and spontaneity of the reaction? -85.6 kJ, spontaneous Temperature is a measure of average ______ energy of individual atoms. kinetic The equation that relates enthalpy, temperature and entropy is Gibbs Free Energy ΔH value in an endothermic reaction is a positive number. True Which substance is the better conductor? Steel eat transfer _____ occurs from hot to cold. always The amount of energy required to raise the temperature of one gram of pure water by one degree Celsius is defined as: a calorie The SI unit of heat and energy is the __________. Joule A catalyst works by lowering the activation energy Entropy is a measure of the number of possible ways that the energy of a system can be distributed. True The __________ law of thermodynamics states that entropy is always increasing. Second Which of the following is NOT true at equilibrium? Gaseous For the reaction... N2(g)+3H2(g)⇌2NH3(g)N2(g)+3H2(g)⇌2NH3(g). If the pressure in the system is increased, which substance(s) will increase in concentration? NH3 When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in the correct answer is: Chemical Equilibrium 2SO2(g)+O2(g)⇌2SO3(g)2SO2(g)+O2(g)⇌2SO3(g). Adding SO3(g)SO3(g) will The correct answer is: shift equilibrium left 2SO2(g)+O2(g)⇌2SO3(g)2SO2(g)+O2(g)⇌2SO3(g). Removing O2(g)O2(g) will The correct answer is: shift equilibrium left What are the two factors to look for when determining if the reaction is at equilibrium? The correct answer is: Forward and reverse reaction rates are equal and concentration is constant This symbol indicates that a reaction is ___________ The correct answer is: reversible For the reaction... SO2+O2⇌SO3SO2+O2⇌SO3. If the concentration of SO2SO2 is increased, the equilibrium of the reaction will shift ___________. The correct answer is: right What is the effect of increasing the pressure on the following equilibrium: 2NO(g) +O2(g)⇌2NO2(g)? The correct answer is: TheyieldofNO 2increases Which of the following is NOT true at equilibrium? The correct answer is: The concentration of the reactants is equal to the concentration of the products. Which of the following would have the highest entropy? A hot gas H2(g)+Cl2(g)⇌2HCl(g)H2(g)+Cl2(g)⇌2HCl(g) The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased? The correct answer is: equilibrium shifts left A(n) _____________ is a device for measuring temperature. The correct answer is: thermometer Which law states "The entropy of a closed system is always increasing"? The correct answer is: 2nd Law The second law of thermodynamics states that entropy of a system tends to ______________. The correct answer is: increase Which law of thermodynamics states that absolute zero cannot be reached? The correct answer is: 3 rd Heat transfer by conduction occurs when... he correct answer is: particles bump into each other A slower particle has a lower energy than an identical, faster particle. The correct answer is 'True'. The transfer of thermal energy between objects of different temperatures is called... The correct answer is: heat When thermal energy is added to a substance, the substance's particles move: The correct answer is: More rapidly at an increased distance from each other. Heat transfer by convection occurs when... The correct answer is: large numbers of atoms move from place to place Thermal energy always moves: The correct answer is: From a high temperature object to a lower temperature object. The first law of thermodynamics states that energy is The correct answer is: conserved It is possible to reach absolute zero. The correct answer is 'False'. A substance with a high specific heat:
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