Energy and Heat

heat

The transfer of energy from a warmer place to a colder place.

Kilocalorie (Kcal)

1000 calories, also known as a NUTRITIONAL or BIG “C” Calorie.

Joule

SI unit for energy/heat=4.184 “c'“ Must use this in the heat equation.

“m”

Symbol that represents the amount of “Mass” in the heat equation.

Endothermic Reaction

Reaction where heat is absorbed from the surroundings, resulting in a decrease in temperature in the surrondings

Specific Heat

The amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

Calorimeter

An instrument used to measure the amount of heat involved in a chemical reaction or other process.

Positive enthalpy (H+)

Heat is GAINED during a chem RXN (ENDO) in the heat equation.

Energy

Ability to do work or produce heat.

“c” from heat equation

represents the specific heat capacity of a substance.

Kilojoule (KJ)

1000 joules

“c”alorie (small c)

Amount of energy needed to raise one g of Water 1 degree Celsius.

“T”

Symbol that represents temperature change in the heat equation.

Chemical potential energy

Energy that is Locked in the bonds of chemical substance

Exothermic reaction

A reaction where energy (heat) is given offto the surroundings, typically resulting in an increase in temperature of the surroundings.

negative enthalpy (H-)

Heat is lost during a chemical reaction, indicating that it releases energy to the surroundings.

“q” (MUST BE IN JOULES)

Symbol for the amount of heat gained or lost in the heat equation.

Law of Conservation of Energy

States that energy can neither be created nor destroyed but it can be transformed.