Chem I: 5.5.16 Due: Stoichiometry Lab Stoichiometry Packet-still missing a few Objectives: Stoichiometry Exam Energy Review and Introduction to Reaction Rates Homework: Energy/Reaction Rate Assignment

Stoichiometry: Limiting Reactants Limiting Reactant: completely consumed during a chemical reaction. Excess Reactant: partially consumed during a chemical reaction en.wikipedia.org

Chem I: 5.9.16 Due: Stoichiometry Lab-some are missing Stoichiometry Packet-still missing a few Objectives: Practice Chemistry Cumulative Exam Energy Review and Introduction to Reaction Rates Homework: Reaction Rates

Thermochemistry Study of how energy flows between matter during physical and chemical changes. Energy is not classified as matter because it does not have a volume or mass. Energy always flows from hot to cold to matter. Energy flow can be measured using a thermometer. Units for Energy: Joules (J) or calories (cal).

Heat Energy Flow Energy flows between: The System: The matter you are studying/measuring. The Surrounding : The matter( the environment) around the system. Energy Processes: Endothermic Process: When more heat is absorbed by the system. Exothermic Process: When more heat is released by the system. 5

Chem I: 5.11.16 Due: Thermochemistry Packet (front page) Objectives: I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. Homework: Reaction Rates

Chemical Energy Potential Chemical Energy: Energy absorbed by system during chemical and physical changes. Stored in the chemical bonds. Causes bonds to break. Kinetic Energy: Energy released by system during chemical and physical changes. Produced during formation of bonds (more stable). Influences the movement of particles in a system. Amount can be measured using a thermometer.

Energy Changes: Thermometer Energy changes between the system and its surroundings can be measured using a thermometer. (Energy changes = Temperature changes) Temp. change indicates a change in speed of particles of system or surroundings (kinetic energy) Primary unit of measurement by scientists: Celsius (oC) and Kelvin (K) scales

Chemical Reaction Energy Diagram Explain using data from graph whether or not this is an endothermic or exothermic reaction. (Potential)

Chemical Reaction Energy Diagram a Explain using data from the graph whether is an endothermic or exothermic reaction. Activation Energy (Potential)

Endothermic Reactions Energy absorbed by system > Energy released Chemical reaction gets warmer and its surroundings gets cooler. Energy is on the reactant side. Decomposition Reactions Ex. Photosynthesis

Exothermic Reaction Energy absorbed by system < Energy released. The chemical reaction becomes cooler and its surroundings gets warmer. Energy is on the product side. Synthesis and Combustion reactions C8H18 + O2 -------> CO2 + H2O + energy

Chem I: 5.12.16 Due: Thermochemistry Worksheet Objectives: I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction.

Endo or Exo Reactions 1. H2O + energy ---> H2 + O2 2. C4H10 + O2 ----> CO2 + H2O + energy 3. Cl2 + KBr ------> KCl + Br2 + energy 4. K + F2 ---> KF + energy 5. Li(OH) + H2(SO4) ----> Li2(SO4) + H2O

Chemical Reactions Rates Reaction Rates = how fast the reactants chemically change into products. Collision Theory: Reactant particles will form products when reactants collide: at the right orientation(position) and exchange the right amount of energy.

Chem I: 5.16.16 Due: Thermochemistry Worksheet Objectives: I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction. I can understand what chemical equilibrium is for a system. Thermochemistry Quiz-Wednesday

Chemical Reactions Rates Reaction Rates = how fast the reactants chemically change into products. Collision Theory: Reactant particles will form products when reactants collide: at the right orientation(position) and exchange the right amount of energy.

Reaction Rates Activation Energy (Potential)

Rates of Chemical Reactions Identify four factors that can influence the rate of a chemical reaction.

Rates of Chemical Reactions Predict how the following factors will influence the rate at which a reaction occurs based on the collision theory. Factors Reactants collide more or less? Reaction Rate increase or decrease? Increase Temperature Increase Concentration (amount) of Reactants Increase Pressure Increase Surface Area of Reactants Add a Catalyst Add an Inhibitor

Reaction Rates Activation Energy (Potential)

Catalyst and Energy Change

Inhibitors Inhibitors slow down a chemical reaction. Inhibitors bind to a catalyst and prevent it from speeding up a reaction. Ex. Preservation of food. Antioxidants prevent foods from becoming stale or moldy.

Chem I: 5.18.16 Due: Thermochemistry Worksheet Chemical Equilibrium Worksheet Objectives: I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction. I can understand what chemical equilibrium is for a system.

Reaction Rates Activation Energy (Potential)

Chemical Equilibrium

Reversible Reactions What does this graph tell you about reversible reactions? http://www.800mainstreet.com/7/0007-000-ans-selftest.html

Reversible Reactions http://www.fccj.us/chm2046/SampleTest/46M10iAnswers.htm http://www.fccj.us/chm2046/SampleTest/46M10iAnswers.htm

Chem I: 5.19.16 Due: Thermochemistry Worksheet Chemical Equilibrium Worksheet Objectives: I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction. I can understand what chemical equilibrium is for a system.

Chem I: 5.20.16 Due: Chemical Equilibrium Worksheet Objectives: Thermochemistry Quiz I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction. I can understand what chemical equilibrium is for a system.

Chemical Equilibrium What factors can affect chemical equilibrium?

Chem I: 5.23.16 Infinite Campus: Stoichiometry Exam Due: Thermochemistry Worksheet Objectives: Thermochemistry Quiz I can understand how energy is associated with changes that matter undergoes. I can classify changes as endothermic and exothermic. I can predict how factors influence the rate of a reaction. I can understand what chemical equilibrium is for a system.

Chemical Equilibrium What factors can affect chemical equilibrium? -Concentration of substances in the reversible reaction. -Temperature -Pressure LeChatelier’s Principle: -If a stress is exerted on system in equilibrium, the system changes in a way to relieve that stress. -The equilibrium position will change.

Changes in Chemical Equilibrium 1. Using Le Chatelier’s Principle, explain how the equilibrium position of this reaction is affected by the following changes? N2O4(g) + 58J ----> 2NO2(g) Addition of heat: b. Decrease in pressure : c. Addition of NO2: d. Removal of N2O4(g):

Final Exam Schedule Time Thursday May 26th Friday May 27th Tuesday Wednesday June 1st 7:30-8:54 1st Period 1st Period Exam 9:00-10:32 2nd period 3rd Period Exam 2nd Period 2nd Period Exam 10:38-11:03 SWAMP 11:09-12:55 4th Period 4th Period Exam 1:01-2:35 5th Period 6th Period Exam 5th Period Exam