Thermochemistry Vocabulary

calorie ___ , abbr. cal, unit of heat energy in the metric system.

calorimeter A ___ is an apparatus for measuring quantities of heat.

chemical energy Energy liberated by a chemical reaction or absorbed in the formation of a chemical compound is referred to as ____.

endothermic ___ a reaction in which heat is absorbed in going from reactants to products. The reactants are at a lower energy state than the products and energy is absorbed in the reaction.

energy ___ is the ability or capacity to do work or to produce change. Forms include heat, light, sound, electricity, and chemical energy.

exothermic ____is a reaction in which heat is given off (released) when going from reactants to products. The reactants start off at a higher energy state than the products, so energy is released in going from reactants to products.

heat ___ is not the same as temperature; nonmechanical energy in transit, expressed as either calories or joules.

joule The SI unit of work or energy is the ___.

kilocalorie ____ - often written as Calorie, big Cal is equal to 1000 calories.

kinetic energy ___ is the form of energy that an object has by reason of its motion. We call it the energy of movement.

Law of Conservation of Energy The _____ states that energy is neither created nor destroyed in any process - it is conserved.

phase change A change from one state (solid or liquid or gas) to another without a change in chemical composition is called a ____.

potential energy Energy stored by an object by virtue of its position is called ____. Similarly, a stretched spring has stored energy that is released when the spring is returned to its unstretched state. Other forms include electrical energy, chemical energy, and nuclear energy.

specific heat ____ is the amount of heat it takes to raise 1g of a substance by 1 degree C.

temperature ____ describes the amount of motion of particles.

thermal energy Energy that has to do with heat is called ____.

thermochemistry _____ is concerned with heat changes that occur during chemical reactions.