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Honors Chemistry II > KINETICS AND THERMODYNAMICS > Flashcards

Flashcards in KINETICS AND THERMODYNAMICS Deck (12)
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1

The speed with which reactants are converted into products

Reaction Rate

2

the minimum amount of energy the colliding reactant particles must have in order for products to form OR the minimum amount of energy required to initiate a reaction

Activation energy

3

the science of the relationship between heat and other forms of energy

Thermodynamics

4

The study of the quantity of heat absorbed or evolved by chemical reactions

Thermochemistry

5

defined as the energy that flows into or out of a system because of a difference in temperature between the system and its surroundings (symbol is q)

Heat

6

a reaction that evolves heat into surroundings (out)

Exothermic reaction

7

A reaction that absorbs heat from surroundings (in)

Endothermic reaction

8

an extensive property of a substance that can be used to obtain the heat absorbed or evolved in a chemical reaction (symbol is H)

Enthalpy

9

states that the enthalpy of a reaction is equal to the total formation energy of the products minus that of the reactants

Law of summation of heats of formation

10

states that for a chemical equation that can be written as the sum of two or more steps, the enthalpy change for the overall equation is the sum of the enthalpy changes for the individual steps

Hess' Law of Heat Summation

11

the chemical equation for a reaction (including phase labels) in which the equation is given a molar interpretation, and the enthalpy of reaction for these molar amounts is written directly after the equation

A Thermochemical equation

12

a substance that alters the rate of a chemical reaction without being used up or permanently changed chemically OR a substance that lowers the activation energy

Catalyst