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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 10
Describe the difference between a chemical equation and a thermochemical equation.
Describe what happens to the enthalpy change if the direction of a reaction is reversed.
Describe what is meant by the standard state of a substance in thermochemical equations.
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 usually given per mole of a specified substance.
Explain why the enthalpy change is different for the formation of water as a gas and as a liquid.
Given the thermochemical equation: 2SO2(g) + O2(g) → 2SO3(g); ΔH = -198 kJ, what is the enthalpy change for the formation of 1 mole of SO3?
Given the thermochemical equation: C(s) + O2(g) → CO2(g); ΔH = -394 kJ, how much heat is released when 12 g of carbon is burned? (Atomic mass of C = 12)
Given the thermochemical equation: N2(g) + 3H2(g) → 2NH3(g); ΔH = -92 kJ, how much heat is released when 1 mole of NH3 is formed?
If the enthalpy change for a reaction is negative, what does this indicate about the reaction?
If the thermochemical equation for the combustion of hydrogen is 2H2(g) + O2(g) → 2H2O(l); ΔH = -572 kJ, what is the enthalpy change for the combustion of 4 moles of hydrogen?
If the thermochemical equation for the formation of ammonia is N2(g) + 3H2(g) → 2NH3(g); ΔH = -92 kJ, what is the enthalpy change for the decomposition of 2 moles of ammonia?
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) given that ΔH = -890 kJ/mol.
Write the thermochemical equation for the decomposition of calcium carbonate (CaCO3) if ΔH = +178 kJ/mol.