Enthalpy Thermodynamics Quiz Questions And Answers
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The SI unit of heat and energy is the __________.
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Heat
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Calorie
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Watt
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Joule
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Have you studied the concept of enthalpy in thermodynamics? Take this enthalpy thermodynamics quiz with questions and answers to see how much you remember. This is a perfect practice test if you wish to practice enthalpy in thermodynamics. Enthalpy is the sum of the system's internal energy and the product of its pressure and volume. This quiz will help you See moretest your knowledge as well as enhance it too. All the best! Do not forget to share it with others.
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- 2.
Temperature is a measure of the average ______ energy of individual atoms.
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Mechanical
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Kinetic
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Potential
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Heat
Correct Answer
A. KineticExplanation
Temperature is a measure of the average kinetic energy of individual atoms. Kinetic energy refers to the energy an object possesses due to its motion. In the context of temperature, it is the random motion of atoms or molecules that determines the temperature of a substance. As temperature increases, the average kinetic energy of the atoms also increases, leading to greater molecular motion and higher temperatures. Therefore, the correct answer is kinetic.Rate this question:
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- 3.
A catalyst works by
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Increasing the temperature
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Lowering the activation energy
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Changing the order of the reaction
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Making the activated complex
Correct Answer
A. Lowering the activation energyExplanation
A catalyst works by lowering the activation energy required for a chemical reaction to occur. Activation energy is the minimum amount of energy needed for reactant molecules to collide with enough force to undergo a chemical transformation. By lowering this energy barrier, a catalyst enables the reaction to proceed more easily and at a faster rate. It does not increase the temperature or change the order of the reaction, but rather provides an alternative pathway for the reaction to take place, making the formation of the activated complex more favorable.Rate this question:
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- 4.
N2 + 3H2 --> 2NH3 How many moles of ammonium is produced when 3 moles of nitrogen react with hydrogen?
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2 moles Ammonium
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6 moles Ammonium
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9 moles Ammonium
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9 moles Hydrogen
Correct Answer
A. 6 moles AmmoniumExplanation
When 3 moles of nitrogen react with hydrogen according to the balanced equation N2 + 3H2 -> 2NH3, it can be observed that for every 3 moles of nitrogen, 2 moles of ammonia are produced. Therefore, if 3 moles of nitrogen react, the corresponding amount of ammonia produced would be (3 moles nitrogen / 3 moles nitrogen) * 2 moles ammonia = 2 moles ammonia. Thus, the correct answer is 2 moles Ammonium.Rate this question:
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- 5.
______ is the amount of energy required to raise the temperature of 1 gram of any substance 1oC.
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Thermal energy
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Conduction
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A calorie
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Specific heat
Correct Answer
A. Specific heatExplanation
Specific heat is the amount of energy required to raise the temperature of 1 gram of any substance by 1oC. It is a property that is unique to each substance and is often used to characterize and compare the heat-absorbing or heat-releasing abilities of different materials. The specific heat of a substance determines how much heat energy is needed to cause a temperature change in that substance.Rate this question:
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- 6.
A 200ml of water is heated by the burning of a biscuit. If the ΔT=45.60C and the change in mass of the biscuit, Δm =5.35g.Find the enthalpy of the biscuit in kJ/g. (Q=mcΔT)
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7.13
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71.3
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38
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7135
Correct Answer
A. 7.13Explanation
The enthalpy of the biscuit can be calculated using the formula Q=mcΔT, where Q is the heat transferred, m is the mass of the biscuit, c is the specific heat capacity of water, and ΔT is the change in temperature. In this case, the change in temperature is given as 45.6°C and the change in mass is given as 5.35g. The specific heat capacity of water is approximately 4.18 J/g°C. By substituting these values into the formula, we can calculate the enthalpy of the biscuit, which is approximately 7.13 kJ/g.Rate this question:
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- 7.
H2 + ½ O2 --> H2O + 285kJ is an example of a(n)
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Heat equation
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Thermochemical equation
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Electrical equation
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None of the above
Correct Answer
A. Thermochemical equationExplanation
The given equation represents a chemical reaction in which hydrogen gas (H2) and oxygen gas (O2) combine to form water (H2O) with the release of 285 kJ of energy. This type of equation is known as a thermochemical equation because it involves the measurement and calculation of heat energy changes during a chemical reaction. Thermochemical equations are used to represent the energy flow in chemical reactions and provide information about the enthalpy change (heat released or absorbed) associated with the reaction.Rate this question:
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- 8.
How much heat does an aluminum block absorb if 10.00 grams are heated from 25.0oC to 50.0oC? The specific heat of aluminum is 0.900J/goC.
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225
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-225
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-450
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450
Correct Answer
A. 225Explanation
When an object absorbs heat, the amount of heat absorbed can be calculated using the equation Q = mcΔT, where Q is the heat absorbed, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the mass of the aluminum block is given as 10.00 grams, the specific heat of aluminum is given as 0.900 J/goC, and the change in temperature is 50.0oC - 25.0oC = 25.0oC. Plugging these values into the equation, we get Q = (10.00 g)(0.900 J/goC)(25.0oC) = 225 J. Therefore, the correct answer is 225.Rate this question:
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- 9.
C+ O2 --> CO2 + 60kJ, what is the value for ΔH for the reaction?
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-30
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30
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-60
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60
Correct Answer
A. -60Explanation
The value for ΔH for the reaction is -60. This is because the reaction is exothermic, as indicated by the positive value for the release of energy (60 kJ). In an exothermic reaction, the products have a lower energy level than the reactants, resulting in a negative ΔH value. Therefore, the correct answer is -60.Rate this question:
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- 10.
How much heat is needed to form 40.0 L of NO2 from its elements at STP? Vm=22.4L N2+ 2O2 -> 2NO2 ΔH = +67kJ
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59.8
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29.1
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119.6
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58.2
Correct Answer
A. 59.8Explanation
The correct answer is 59.8. The equation given is N2 + 2O2 -> 2NO2. This means that for every 1 mole of N2, 2 moles of O2 are needed to form 2 moles of NO2. Since the volume of NO2 is given as 40.0 L, which is equal to 2 moles of NO2 (since 1 mole of gas occupies 22.4 L at STP), we can conclude that 1 mole of N2 and 2 moles of O2 are needed to form 40.0 L of NO2. The enthalpy change for the reaction is given as +67 kJ. Therefore, to find the heat needed to form 40.0 L of NO2, we can use the equation: (67 kJ / 2 moles) x 1 mole = 33.5 kJ. Converting kJ to J, we get 33,500 J, which is equal to 59.8 kJ.Rate this question:
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Aug 16, 2023Quiz Edited by
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Nov 20, 2022Quiz Created by
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