Thermochemical Equations
Chemistry ⇒ Thermochemistry and Energetics
Thermochemical Equations starts at 10 and continues till grade 12.
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Describe how you would write a thermochemical equation for the neutralization of hydrochloric acid with sodium hydroxide.
Describe the difference between a thermochemical equation and a standard chemical equation.
Describe the significance of the sign of ΔH in a thermochemical equation.
Describe the steps to calculate the enthalpy change for a reaction using a thermochemical equation and a given amount of reactant.
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(g)?
Given the thermochemical equation: C(s) + O2(g) → CO2(g); ΔH = -394 kJ, what is the enthalpy change when 2 moles of carbon are burned?
Given the thermochemical equation: H2(g) + Cl2(g) → 2HCl(g); ΔH = -184 kJ, what is the enthalpy change for the formation of 1 mole of HCl(g)?
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)?
Which of the following best describes an endothermic reaction? (1) Heat is released (2) Heat is absorbed (3) ΔH is negative (4) ΔH is zero (1) 1 only (2) 2 only (3) 1 and 3 (4) 2 and 4
Which of the following is a correct statement about thermochemical equations? (1) They can be used to calculate the heat change for any amount of reactant (2) They are only valid for the exact amounts shown (3) They do not depend on the physical state of substances (4) They do not include ΔH (1) 1 (2) 2 (3) 3 (4) 4
Which of the following is NOT a feature of a thermochemical equation? (1) Balanced equation (2) Physical states (3) Enthalpy change (4) Rate of reaction (1) 1 (2) 2 (3) 3 (4) 4
Which of the following is NOT a requirement for writing a correct thermochemical equation? (1) Balanced chemical equation (2) Inclusion of ΔH (3) Indication of physical states (4) Inclusion of catalyst used (1) 1 (2) 2 (3) 3 (4) 4
Fill in the blank: In a thermochemical equation, the enthalpy change is written on the ________ side of the equation if the reaction is exothermic.
Fill in the blank: The enthalpy change for a reaction carried out at constant pressure is called the ________ change.
Fill in the blank: The enthalpy change for a reaction is dependent on the ________ of the reactants and products.
Fill in the blank: The enthalpy change for a reaction is represented by the symbol ________.
State whether the following statement is true or false: The coefficients in a thermochemical equation refer to the number of moles of each substance involved in the reaction.
True or False: If a thermochemical equation is multiplied by a factor, the enthalpy change (ΔH) must also be multiplied by the same factor.
True or False: The enthalpy change (ΔH) in a thermochemical equation is positive for exothermic reactions.
True or False: The enthalpy change for a reaction can be calculated using thermochemical equations and stoichiometry.
