CHEMISTRY Week 10 and 11 Ms. deVesty

ClassConnect Rules:  Mic and Speakers must be functioning properly  Students will raise their hand when they have a question/comment.  Students will NOT participate in private chat with other students during a lesson  Students will participate in lessons when asked by the teacher.  When using the Web Cam, students must follow NMVA Web Cam Policies.  Student will ALWAYS be respectful of the teacher and classmates. Webcam Policies:  Students and Staff will be properly dressed during usage of Webcam (dress code in NMVA Handbook).  Students and Staff will ensure the background during the Webcam usage is appropriate and distraction free.

Strand I: Scientific Thinking and Practice  Standard I: Understand the processes of scientific investigations and use inquiry and scientific ways of observing, experimenting, predicting, and validating to think critically. Strand II: The Content of Science  Standard I (Physical Science): Understand the structure and properties of matter, the characteristics of energy, and the interactions  between matter and energy.  9-12 Benchmark I: Understand the properties, underlying structure, and reactions of matter.  Properties of Matter  1. Classify matter in a variety of ways (e.g., element, compound, mixture; solid, liquid, gas; acidic, basic, neutral).  2. Identify, measure, and use a variety of physical and chemical properties (e.g., electrical conductivity, density, viscosity, chemical  reactivity, pH, melting point).  3. Know how to use properties to separate mixtures into pure substances (e.g., distillation, chromatography, solubility).  4. Describe trends in properties (e.g., ionization energy or reactivity as a function of location on the periodic table, boiling point of  organic liquids as a function of molecular weight).

OBJECTIVES:  Explain the law of conservation of energy.  Contrast exothermic with endothermic processes.  Use calories and joules to calculate heat flow in chemical reactions.  Define enthalpy and its use in understanding energy relationships in chemical reactions.  Apply Hess's law to determine the heat of a reaction.

Date3/10/143/11/143/12/143/13/143/14/14 Unit Name Unit 4: Chemical Thermodynamics Lesson 6: Changes in Enthalpy SBA Testing Unit 4: Chemical Thermodynamics Lesson 7: Your Choice Unit 4: Chemical Thermodynamics Lesson 8: Mid Unit Test Work to Complete 4.06 Changes in Enthalpy 4.07 Your Choice 4.08 Mid-Unit Test 4.08 Mid-Unit Test: Part 1 Assignment Due Date 3/10/2014 3/13/20143/14/2014 Graded Activities Due This Day 4.08 Mid-Unit Test: Part 1 Date3/17/143/18/143/19/143/20/143/21/14 Unit Name Unit 4: Chemical Thermodynamics Lesson 9: Writing Thermochemical Equations Unit 4: Chemical Thermodynamics Lesson 10: Heat during Changes of State Unit 4: Chemical Thermodynamics Lesson 11: Hess’s Law Unit 4: Chemical Thermodynamics Lesson 12: Your Choice Unit 4: Chemical Thermodynamics Lesson 13: Unit Test Work to Complete 4.09 Writing Equations 4.10 Heat & Changes of State 4.10 Quiz 4.11 Hess’s Law 4.12 Your Choice 4.13 Unit Test 4.13 Unit 4 Test: Part 1 Assignment Due Date 3/17/20143/18/20143/19/20143/20/20143/21/2014 Graded Activities Due This Day 4.10 Quiz 4.13 Unit 4 Test: Part 1

VIDEOS:

Methanol (CH 3 OH) has a heat of fusion of 3.16 kJ/mol. Which of the following is the heat of solidification that occurs when 63 grams of liquid methanol freezes? A. –199 kJ B. –6.32 kJ C kJ D. 199 kJ

Methanol (CH 3 OH) has a heat of fusion of 3.16 kJ/mol. Which of the following is the heat of solidification that occurs when 63 grams of liquid methanol freezes? A. –199 kJ B. –6.32 kJ C kJ D. 199 kJ

C=12 X 163GRAMS /32=1.97MOLES H=1 X 4 O=16 X 1 32 Methanol (CH 3 OH) has a heat of fusion of 3.16 kJ/mol. Which of the following is the heat of solidification that occurs when 63 grams of liquid methanol freezes? For the first question, you want to calculate out the molar weight of methanol first. So you'd add up the molar weights of carbon, oxygen, and four hydrogen. Then you'd see how many moles you have. Do this by dividing the number of grams by the molar weight. Finally, multiply the number of moles by the heat of fusion to get the energy needed.

1.97MOLES X3.16KJ/MOL= 6.32KJ NOW TO DECIDE IF IT'S POSITIVE OR NEGATIVE. I ALWAYS REMEMBER THIS BY THINKING OF AN EXPLOSION. AN EXPLOSION HAS AN EXTREME AMOUNT OF ENERGY COMING OUT OF THE REACTION. MOST OF THE TIME AN EXPLOSION IS NEGATIVE (DESTRUCTIVE). SO IF HEAT COMES OUT THEN IT'S NEGATIVE. IF YOU HAVE TO PUT HEAT IN TO MAKE IT GO, THEN IT'S POSITIVE. YOU WOULD ALWAYS HAVE TO PUT HEAT IN TO MAKE IT MELT, BUT THIS IS WHEN IT FREEZES, SO IT'S THE OPPOSITE OR HEAT COMES OUT, SO IT'S NEGATIVE. =-6.32KJ

Consider the amount of heat energy delivered to an object by the same mass of liquid water at 100°C and steam at 100°C. Which of the following is true? A. Liquid water delivers more energy because it has more mass. B. Steam delivers more energy because it condenses. C. Liquid water and steam deliver the same amount of energy. D. Steam delivers more energy because it is at a higher temperature.

Consider the amount of heat energy delivered to an object by the same mass of liquid water at 100°C and steam at 100°C. Which of the following is true? A. Liquid water delivers more energy because it has more mass. B. Steam delivers more energy because it condenses. C. Liquid water and steam deliver the same amount of energy. D. Steam delivers more energy because it is at a higher temperature.

Date3/10/143/11/143/12/143/13/143/14/14 Unit Name Unit 4: Chemical Thermodynamics Lesson 6: Changes in Enthalpy SBA Testing Unit 4: Chemical Thermodynamics Lesson 7: Your Choice Unit 4: Chemical Thermodynamics Lesson 8: Mid Unit Test Work to Complete 4.06 Changes in Enthalpy 4.07 Your Choice 4.08 Mid-Unit Test 4.08 Mid-Unit Test: Part 1 Assignment Due Date 3/10/2014 3/13/20143/14/2014 Graded Activities Due This Day 4.08 Mid-Unit Test: Part 1 Date3/17/143/18/143/19/143/20/143/21/14 Unit Name Unit 4: Chemical Thermodynamics Lesson 9: Writing Thermochemical Equations Unit 4: Chemical Thermodynamics Lesson 10: Heat during Changes of State Unit 4: Chemical Thermodynamics Lesson 11: Hess’s Law Unit 4: Chemical Thermodynamics Lesson 12: Your Choice Unit 4: Chemical Thermodynamics Lesson 13: Unit Test Work to Complete 4.09 Writing Equations 4.10 Heat & Changes of State 4.10 Quiz 4.11 Hess’s Law 4.12 Your Choice 4.13 Unit Test 4.13 Unit 4 Test: Part 1 Assignment Due Date 3/17/20143/18/20143/19/20143/20/20143/21/2014 Graded Activities Due This Day 4.10 Quiz 4.13 Unit 4 Test: Part 1

QUESTIONS OR CONCERNS? HAVE A GREAT WEEK!