General Chemistry I Lecture #19

A set of practice flashcards based on Lecture #19 of General Chemistry I, covering key concepts related to enthalpy, calorimetry, and thermochemical equations.

What is the formula for calculating enthalpy change (ΔH) for a reaction?

ΔH = Hproducts - Hreactants

What type of reaction is indicated when ΔH is negative?

Exothermic reaction.

What is the enthalpy change when 4.50 g of methane gas (CH4) is burned?

-250 kJ.

What is calorimetry?

The measurement of heat flow.

What does heat capacity (C) measure?

The temperature change when an object absorbs a certain amount of heat.

What is specific heat capacity?

The heat capacity of one gram of a substance.

What does it mean if a reaction releases heat to the surroundings?

The reaction has a negative enthalpy change (ΔH < 0).

What is the molar heat capacity (C_m)?

The heat capacity of one mole of a substance.

What is the significance of the states of reactants and products in enthalpy changes?

The enthalpy change for a reaction depends on the states of the reactants and products.