Heat and Energy! Created by Educational Technology Network. www.edtechnetwork.com 2009

Heat Definition Endo vs. Exo Variables Rx Rate 10 10 10 10 10 20 20 20 20 20 30 30 30 30 30 40 40 40 40 40 50 50 50 50 50

Topic 1 – 10 Points What are the units for heat? QUESTION: ANSWER: Joules or Kilojoules

Topic 1 – 20 Points Energy QUESTION: ANSWER: Heat is defined as the transfer of _______ . ANSWER: Energy

Topic 1 – 30 Points QUESTION: If we increased the number of moles of CO2 in the reaction to 4, how much energy would we need? 2CO2(g) + 483.6 kJ  2C(s) + O2(g) ANSWER: 967.2 kJ

Topic 1 – 40 Points QUESTION: What three things are needed to calculate the heat gained by an object? ANSWER: mass, specific heat of object, change in temp of object

Topic 1 – 50 Points QUESTION: If you set your hand on an active hot plate, explain what happens to your hand at the molecular level. ANSWER: Large amounts of energy in the form of heat are being transferred to your hand which increases the average kinetic energy of the molecule.

Topic 2 – 10 Points QUESTION: ANSWER: Thermochemistry The study of energy transfers as heat. ANSWER: Thermochemistry

Topic 2 – 20 Points QUESTION: The measure of average Kinetic energy of particles. ANSWER: Temperature

Topic 2 – 30 Points QUESTION: Changes the rate of a reaction but is not consumed in the process ANSWER: catalyst

Daily Double Topic 2 – 40 Points QUESTION: Quantity of heat needed to raise the temp of 1 gram of a substance by 1℃ or 1K ANSWER: Specific Heat Daily Double

Topic 2 – 50 Points Energy required for a reaction to occur. QUESTION: ANSWER: Activation Energy

Topic 3 – 10 Points Heat is absorbed during the reaction. QUESTION: ANSWER: endothermic

Topic 3 – 20 Points This reaction feels cold QUESTION: ANSWER: Endothermic

Topic 3 – 30 Points QUESTION: - H ANSWER: Exothermic

Topic 3 – 40 Points 2H2O(g) + 483.6 kJ  2H2(g) + O2(g) QUESTION: ANSWER: Endothermic

Topic 3 – 50 Points QUESTION: ANSWER: Exothermic

Topic 4 – 10 Points QUESTION: What is the variable for heat? ANSWER: Q

Topic 4 – 20 Points c or cp What is the variable for specific heat? QUESTION: What is the variable for specific heat? ANSWER: c or cp

Topic 4 – 30 Points What is K? Temperature in Kelvins QUESTION: ANSWER: Temperature in Kelvins

Topic 4 – 40 Points activation energy QUESTION: ANSWER: What does Ea mean? ANSWER: activation energy

Topic 4 – 50 Points QUESTION: What does ΔS mean? ANSWER: Entropy

Topic 5 – 10 Points QUESTION: ANSWER: Lowering the temperature has what effect on reaction rate? ANSWER: Decrease Rx rate

Topic 5 – 20 Points QUESTION: ANSWER: Increasing the concentration of the subject chemical should have what effect on the reaction rate? ANSWER: Increased Rx Rate

Topic 5 – 30 Points QUESTION: Name four of the five factors that affect reaction rate. ANSWER: Surface Area, Nature of Reactants, Catalyst, Temperature, Concentration

Topic 5 – 40 Points QUESTION: Particles must collide with enough energy and force at a proper orientation in order for a reaction to occur. Name the theory. ANSWER: Collision Theory

Topic 5 – 50 Points QUESTION: A catalyst lowers the _________ ________ of a reaction ANSWER: Activation energy

Final Jeopardy Question: Given: N2 (g) + O2 (g)  2 NO (g) ΔH = -180.5 kJ N2 (g) + 3 H2 (g)  2 NH3 (g) ΔH = -91.8 kJ 2 H2 (g) + O2 (g)  2 H2O (g) ΔH = -483.6 kJ Find: 4 NH3 (g) + 5 O2 (g)  4 NO (g) + 6 H2O (g) Answer: ΔH = -1628 kJ