The value of a measured for an exothermic reaction will be larger than the value of...
12. Which statement is always true for an exothermic reaction? A) The enthalpy change is negative. B) The reaction absorbs heat from the surroundings. C) The enthalpy change is positive. D) The work done on the system is zero
Which statements are true? Δ?ΔH for an exothermic reaction is positive. When energy is transferred as heat from the surroundings to the system, Δ?ΔH is negative. When energy is transferred as heat from the system to the surroundings, Δ?ΔH is negative. The evaporation of water is an exothermic process. Δ?ΔH for an endothermic reaction is positive. A combustion reaction is exothermic.
The combustion of octane is an exothermic reaction. Which statement is true for an exothermic reaction? a) It consumes heat because the reactants have a lower energy than the products. b) It releases heat because the reactants have a higher energy than the products. c) It consumes heat because the reactants have a higher energy than the products. d) It releases heat because the reactants have a lower energy than the products.
(T/F) The series combination of any two resistors is larger than the value of either resistor by iteself. True False (T/F) Two 470kO resistors in series have an equivalent resistance of 0.94M. True False
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1. Calculate AE and determine whether the process is exothermic or endothermic for the following cases: L. When a chemical reaction produces 90.7 kJ of heat but does no work on its surroundings. il. When combustion of a gas releases 2100U of heat to its surroundings. ii. When 33.05 kd of heat is transferred to the system and 22.0 kJ of work on the surroundings. Iv. When 121 kJ of work is performed...
A reaction profile (not to scale!) for the reaction 03 + NO +02 + NO2 is shown below: E (kJ) 11 03 + NO 200 O2 + NO2 Reaction Coordinate Which of the following are true? Choose all that apply. The value of Ea in the presence of a catalyst would be larger than 11.0 kJ. AE is positive. The magnitude of Ea for the reverse reaction is larger than 11.0 kJ. The value of AE in the presence of...
15. For a positively skewed distribution, the mean usually has a larger value than either the median or the mode. Hint: Sketch a positively skewed distributions and then figure out where the mean would be for that distribution. . .need to think about this one…sketching always seems to help. a. True b. False
True or False
t. For an exothermic reaction, the equilibrium constant, Kc, becomes smaller as the temperature increases and larger as the temperature decreases. u. The gas-phase equilibrium shown below is used to produce ammonia, NH3, for commercial applications. The NH3 yield can be increased by decreasing the temperature, increasing the pressure, and removing some NH; from the mixture. N2(g) + 3H2(g) - 2NH3() AH = -94 kJ. v. For the gas-phase equilibrium described above (see problemlu), an increase in...
In ANOVA test, if the F test statistics is larger than or equal to the critical value, we should reject the null hypothesis. True False
1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61.6 J. b. 30.8 J. c. -61.6 J. d.-30.8 J. e. none of these 2. Which of the following statements correctly describes the signs of q and w for the following exothermic process at P= 1 atm and T = 370 K? H2O(g) → H2O(1) a. q and w are negative. b. is positive, wis...