Enthalpy of Chemical Reactions

What is always associated with chemical reactions?

• Change in colour

• Change in energy

• Change in state

• Change in mass

In what forms can the change in energy during a chemical reaction be observed?

• Heat, light, or sound

• Colour, mass, or volume

• Temperature, pressure, or density

• Shape, size, or texture

What does a thermochemical equation include?

• The mass of reactants

• The heat change in the reaction

• The volume of the reactants

• The pressure of the reaction

In the given thermochemical equation, what is the heat change?

Which of the following is a product in the given thermochemical equation?

• Endothermic

• Exothermic

• Neutralisation

• Decomposition

In an exothermic reaction, where is the energy written in the chemical equation?

• On the reactants side

• On the products side

• In the middle of the equation

• It is not written in the equation

What is produced in an exothermic reaction?

• Cold

• Light

• Heat

• Electricity

What type of reaction is represented by the equation: 2NaHCO₃(s) + 129 kJ → 2Na₂CO₃(s) + H₂O(g) + CO₂(g)?

• Exothermic

• Endothermic

• Combustion

• Decomposition

In an endothermic reaction, where is the energy term (kJ) written in the chemical equation?

• On the products side

• On both sides

• On the reactants side

• It is not included in the equation