Sarah’s Chemistry Chapter 17 – Flashcards

the study of energy changes that occur during chemical reations and changes in state.

the energy stored in the chemical bonds of a substance.

represented by q, energy that transferse from one object to another because of temperature difference between them.

the part of the universe on which you focus your attention.

everything else in the universe.

in any chemical or physical process, energy is neither created nor destroyed. 1st law of thermodynamics.

absorbs heat from its surroundings. POSITIVE.

realses heat to its surroundings. NEGATIVE.

the amount of heat it takes to raise the temperature of 1g of the substance 1 degree C

the amount of heat needed to increase the temperature of an object exactly 1 degree C

Heat always flows from a warmer object to a cooler object.

In an enothermic process, the system gains heat as the surroundings cool down.

In an exothermic process, the system loses heat as the surroundings heat up.

Heat flow is measured in two common units, the calorie and the joule.

The heat capacity of an object depends on both its mass and its chemical composition.

the precise measurement of the heat flow into or out of a system for chemical and physical procesesses.

The insulated device used to measure the absorption or release of heat in chemical or physical processes.

The heat content of a system at constant pressure is the same as a property. (H)

A chemical equation that includes the enthalpy change.

the enthalpy change for the chemical equation exactly as it is written.

the heat of reaction for some complete burning of one mole of a substance.

In calorimetry, the heat released by the system is equal to the heat absorbed by its surroundings. Conversely, the heat absorbed by a system is equal to the heat relased by its surrounding.

In a chemical equation, the enthalpy change for the reaction can be written as either a reactant or a product.

The heat absorbed by one mole of a solid substance as it melts to a liquid at a constant temperature.

The heat lost when one mole of a liquid solidifies at a constant temperature.

The amount of heat necessary to vaporize one mole of a given liquid.

The amount of heat released when 1 mol of vapor condenses at the normal boiling point.

The enthalpy change cause by dissolution of one mole of substance.

The quantity of heat absorbed by a melting solid is exactly the same as the quantity of heat released when the liquid solidifies, that is ......

The quanity of heat absorbed by a vaporizing liquid is exactly the same as the quantity of heat released when the vapor condenses, that is ..............

During the formation of a solution, heat is either released or absorbed.