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Chem Test: Exo/Endothermic reactions
Terms in this set (21)
Explain the collision model of chemical reactions
For the reaction to occur, the particles must collide. (particles, molecules, or ions).
Effect of concentration on reaction rates in terms of the collision theory
The greater the concentration of particles, the more likely it is for them to collide. It increases the probability of collision.
Effect of surface area of a solid reactant on reaction rates in terms of the collision model
The greater the surface area of the reactants, the greater the probability is for the reactants to collide and react.
The minimum energy required for a reaction to occur.
Effect of temperature change on most reactions
Increasing the temperature increases the kinetic energy of the molecules.
Explain why a temperature increase affects the rate of reaction
At a higher temperature, more particles have the required activation energy. see yellow notes
Interpret kinetic distribution curves for reactions in terms of the location of activation energy, effect of catalyst, and effect of temperature change.
Location of Activation energy- where particles have required energy to collide and have a reaction occur
Effect of Catalyst- lowers energy requirement, more particles can react
Effect of temperature change- higher temp, more particles have required activation energy because graph is moved over.
Use kinetic energy distribution curve to explain why an increase in temperature increases the rate
see yellow notes- increases in tempertature increases the rate of reaction because at the higher temp, more particles have the required activation energy
Interpret potential energy diagrams for a reaction.
- locate activated complex
- determine heat of reaction
- determine activation energy for both forward and reverse reactions
- illustrate effect of catalyst
Activated Complex- very top of reaction
Heat of Reaction- between products and reactants
Activation Energy- reactants to activated complex
Activation energy of reverse reaction- flip around, reactants to products
Identify endo/exothermic reactions based on potential energy diagrams
Exothermic- potential energy goes down( heat content)
Endothermic- potential energy goes up
series of steps by which a reaction occurs
Rate Determining step
the SLOWEST step in a reaction mechanism
a substance the speeds up the rate of reaction but is NOT used up in the reaction
Explain how a catalyst works in terms of activation energy and the reaction mechanism
lowers the activation energy by changing the reaction mechanism
catalyst in a biological reaction
Given the set of reactions for a reaction mechanism, determine the net reaction by algebraically adding the individual steps, pick out the rate determining step.
cross out same particles on different sides of equation, add the remaining up into net reaction.
the energy stored in a substance
Identify reactions as endo/exothermic wither by which side the energy term is on or by the heat content
Energy in products- exothermic
Energy in reactants- endothermic
-heat content= exothermic
Rewrite Equations from having the energy term in the equation to the appropriate heat content or vice versa.
Given an energy equation determine whether the reactants or products have the greater heat content.
heat content positive(endothermic)- products
heat content negative(exothermic)- reactants
Given an energy equation place the reactants and the products in the proper positions on a potential energy diagram relative to each other.
Exothermic- products below reactants
Endothermic- products above reactants
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