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Thermochemical Equations

Chemistry ⇒ Thermochemistry and Energetics

Thermochemical Equations starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Thermochemical Equations. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
Describe how to write a thermochemical equation for the dissolution of NaCl(s) in water, given ΔH = +3.9 kJ/mol.
Describe the difference between an endothermic and an exothermic thermochemical equation.
Describe the steps to write a thermochemical equation for the neutralization of HCl(aq) with NaOH(aq), given ΔH = -57.1 kJ/mol.
Explain why it is important to specify the physical states of substances in a thermochemical equation.
Explain why the enthalpy change for a reaction is an extensive property.
Explain why the enthalpy change for the vaporization of water is different from that for the fusion of ice.
Given the following thermochemical equations: (1) C(s) + O2(g) → CO2(g); ΔH = -393.5 kJ, (2) H2(g) + 1/2O2(g) → H2O(l); ΔH = -285.8 kJ, calculate the enthalpy change for the reaction: C(s) + 2H2(g) + O2(g) → CH3OH(l), given ΔHf° (CH3OH) = -238.7 kJ.
Given the thermochemical equation: 2Al(s) + 3Cl2(g) → 2AlCl3(s); ΔH = -1408 kJ, what is the enthalpy change for the formation of 1 mole of AlCl3(s)?
Given the thermochemical equation: 2H2O2(l) → 2H2O(l) + O2(g); ΔH = -196 kJ, what is the enthalpy change for the decomposition of 1 mole of H2O2(l)?
Given the thermochemical equation: 2SO2(g) + O2(g) → 2SO3(g); ΔH = -198 kJ, what is the enthalpy change for the production of 4 moles of SO3(g)?
Given the thermochemical equation: CaCO3(s) → CaO(s) + CO2(g); ΔH = +178 kJ, is the reaction endothermic or exothermic?
Given the thermochemical equation: N2(g) + 3H2(g) → 2NH3(g); ΔH = -92 kJ, what is the enthalpy change for the formation of 1 mole of NH3(g)?
If the enthalpy change for a reaction is written as ΔH = -200 kJ, what does the negative sign indicate?
If the thermochemical equation for the formation of water is: 2H2(g) + O2(g) → 2H2O(l); ΔH = -572 kJ, what is the enthalpy change for the formation of 1 mole of water?
What is a thermochemical equation?
Write the thermochemical equation for the combustion of methane (CH4) in oxygen, given that ΔH = -890 kJ/mol.