Chemistry Study Guide Oct 2nd 1 hour Exam Chapter 9- Thermodynamics KE= ½ mv2 w= F∆x w= force × distance ∙ A state function refers to a property of the system that depends only on its present state. ∙Internal Energy = heat + work ∆E = q + w ∙Pressure = Force/Area = P = F/A ∙Work= - external pressure × change in volume w = - P∆V Enthalpy H = E + PV qp = ∆E + P∆V ∆H = qp ∆H = H products H reactants
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5.2 Energy conversion and conservation 1. A change from one form of energy to another is called an energy conversion. 2. Is the following sentence true or false? Most forms of energy can be converted into other forms. True 3. Describe the conservation of chemical energy to mechanical energy in your body. Your body changes chemical energy which was in your food through the system of digestion. Once the energy is released‚ it turns to mechanical energy to move your muscles 4. When you throw
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Heat in physics is defined as energy in transit. It is symbolized with the alphabet Q. (Strong‚ Martin C. The Great Alternative and Indie Discography of Heat) It is mostly connected with different movements of atoms‚ molecules and other particles. These particles either consist of particles that are either hot or cold. High temperature bodies‚ are often caused due to the high heat transfer‚ which is created by chemical reactions‚ nuclear reactions‚ electromagnetic dissipation‚ or mechanical dissipation
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SOME BASIC TIPS ON HOW TO WRITE A LAB REPORT Just searching on line will give you hundreds of examples so I just want to keep this really simple and basic and if you want to or need more explanation‚ just search the specific heading like “ How to write a conclusion on a lab report” and you will get more info than you ever wanted! Title Page • The title of the experiment. • Your name. • The name of the class. • The date the lab was performed or the date the report was submitted
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Effect of Temperature on Cricket Respiration Crickets are ectotherms that rely on their environment as a source of heat for their metabolism. Warmer temperatures allow crickets to respire at a greater rate. Respiration rate (ppm/sec/g) 1.2 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 45 Temperature (°C) Figure 1: Respiration rate (ppm/sec/g) of crickets at 6 different temperatures (°C). Values are means of 6 respiration rate measurements. Error bars represent
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Determining the enthalpy change for the thermal decomposition of potassium hydrogen carbonate into potassium carbonate. Controlled Variables: 1. Volume of HCl ± 0.5 cm3 (± 2%) 2. Concentration of HCl‚ 3. Same mass of K2CO3 and KHCO3 within specified ranges of 2.5 – 3.0g and 3.25 – 3.75g respectively 4. Same calorimeter used i.e. polystyrene cup is used in this experiment 5. Same thermometer will be used ± 0.10K 6. Same source of K2CO3‚ KHCO3 and HCl Raw Data Results: The raw
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Heat resistance of endospores of Bacillus pumilus Abstract Spore suspension of Bacillus pumilus was inoculated into universal bottles containing sterile distilled water in water baths at temperatures of 85°C‚ 90°C and 95°C. At specific time intervals‚ a sample was removed and spread on nutrient agar plates. The number of colonies formed was used to determine the D-value and z-value. The D-value for 85°C is 64.1 minutes‚ 25.7 minutes for 90°C and 8.2 minutes for 95°C while the z-value is 11
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EXPERIMENT #1: Representing Systems and Models: The Tea Lab HOMEWORK QUESTIONS: 1) An open system exchanges matter and energy with its surroundings. A closed system exchanges energy but no matter with its environment. An isolated system exchanges neither matter nor energy with its environment. Isolated systems do not exist naturally though it is possible to think of the entire universe. The tea system is an open system because it exchanges energy (heat) with its air/surroundings. 2)
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While working in the Financial Aid field I have had the privilege of working with a number of different individuals of diverse backgrounds. I have come across people from all walks of life‚ including those with severe disabilities‚ individuals with limited resources‚ and even individuals with different cultural and ethical backgrounds. Each encounter has been unique in its own way with learning experiences that I have carried with me through my years of employment. Additionally when growing up I
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My topic is about using bubble wrap to save the energy! Staying energy efficient is crucial in saving money. When I moved into my first house on campus‚ I was very shocked at the first heating bill. Soon after‚ I decided to find ways to lower my energy bill‚ through means of energy efficiency. After learning about energy efficiency in class‚ I learned that big portion of energy is consumed by space heating. So I insulated my windows with bubble wrap. I recently received my next heating bill to see
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