Before class on Oct. 12,
- Please watch the three videos below.;
- Complete these notes;
- Make a comment
- In addition, read this short text from Brown and LeMay, Chemistry: the Central Science, and answer the thinking questions on your notes. Everything we do is connected in one way or another with energy. Not only our modern society but life itself depends on energy for its existence. The issues surrounding energy – its sources, production, distribution, and consumption – pervade conversations in science, politics, and economics, and relate to environmental concerns and public policy.
Think: List one current event topics that you might understand better if you had a better understanding of energy.
With the exception of energy from the Sun, most of the energy used in our daily lives comes from chemical reactions. The combustion of gasoline, the production of electricity from coal, the heating of homes by natural gas, and the use of batteries to power electronic devices are all examples of how chemistry is used to produce energy. Even solar cells rely on chemistry to produce the silicon and other materials that convert solar energy directly to electricity. In addition, chemical reactions provide the energy that sustains living systems. Plants use solar energy to carry out photosynthesis, allowing them to grow. The plants in turn provide food from which we humans derive the energy needed to move, maintain body temperature, and carry out all other bodily functions.
List three ways we use energy in our daily lives:
Think: It is evident that the topic of energy is intimately related to chemistry. What exactly is energy, though, and what principles are involved in its production, consumption, and transformation from one form to another? Write down your thoughts about this question now.
chemistry matters 
Today, I learned that thermodynamics is the study of energy and its transformations and thermochemistry is the study of chemical reactions and related energy changes involving.
Question: none for now.
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In these videos, I learned about energy and its applications to thermochemistry (a study of energy changes in chemical reactions involving heat). I learned how to fin the kinetic (motion) energy of something. Atoms and molecules have kinetic energy. I also learned about potential energy (which can be found in chemical bonds). Under Coulomb’s Law, we know that the potential energy is proportional to the distance between two particles of like charges. I learned about units of measurement for energy (Joules and calories), how they are derived and how they relate to each other. I learned about isolated systems (where neither energy nor matter can get in or out), open systems (where both energy and matter can flow in and out) and closed systems (where only energy can flow in and out). I learned that energy is transferred through work and heat. Since we know that energy can neither be created nor destroyed, we know that the change in energy has to be the same as the final energy minus the initial energy. The combination of both the potential and kinetic energy is known as the internal energy. If the change in energy is positive, then an endothermic reaction occurred and system absorbed energy. If the change in energy is a negative number, then an exothermic reaction occurred and the system lost energy. We can also find the change in energy by combining the work done with the heat transferred.
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can you only figure out the change in energy with the joules of work and heat, or can you find it with both units of heat or work ?
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the units of both heat and work are joules.
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Today I learned that energy does not always have to do with objects. Energy can also refer to atoms and molecules, and the transfer of electrons. I learned that the change in energy is equal to the work done in addition to the loss or addition of heat.
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I learned that energy can not be gained or lost. It can only be transferred by work or heat.
I have no questions.
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I learned about thermochemistry as well other types of energy, such as kinetic energy, which is energy in motion, and potential energy, which is energy of position. You can find the internal energy by finding the heat and work and subtracting the work from the heat. If the energy is being lost, then the number of Joules for energy will be negative, but if it is being gained, then it will be positive. To figure out if work will be positive or negative, we have to look at a chart.
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Today i learned thermodynamics which is study of energy and its transformation and also how energy can transfered. we learned about conservation of energy and two ways to transfer energy.
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Thermochemistry is the study of chemical reactions and related energy changes involving heat. I learned about how energy, heat, and work are related to each other and how kinetic energy and potential energy are studied in chemistry. Kinetic energy is atoms or molecules moving and potential energy is in bonds – it depends on where they are and how close they are. Joules and calories are two units of energy. A system is what we are focused on and the surrounding is everything around the system. There are three types of systems: open, closed, and isolated. Work and heat are two ways to transfer heat.
Question: I was confused about the Eposition thing when we were talking about Electrostatic Potential Energy. Could someone further explain this (even though Mrs. Irwin said it’s okay if we were confused)?
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In these videos I learned about energy and thermochemistry. I learned that energy is transferred through work and heat. The units for both work and heat are joules. If there is a positive change in energy then it’s an endorthermic reaction and a negative change in energy is an exothermic reaction.
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In these videos, I learned about thermodynamics, or thermochemistry, which is the study of energy, its transformation and changes. I learned about energy, work, and heat and how they relate to each other. I learned about the kinetic energy, the potential energy and how to calculate the total energy. I also learned about the internal energy and the way to determine whether the sings for heat, work, and change in energy is positive or negative.
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In this lesson, I learned about thermochemistry (the study of chemical reactions and related energy changes involved heat) and energy (the capacity to do work or transfer heat). All the energy in the universe is equal to the potential energy + kinetic energy. Energy can not be created or destroyed.
Question: is the First Law of Thermodynamics essentially the same as the Law of conservation of Matter and Energy?
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In the vitro I learned that the first law of thermodynamics is thay energy can not be created or destroyed. Also learned that Kinetic Energy is energy of motion opposed to Potiential energy being energy of position.
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In this video I learned the conservation of energy is transferred between the surrondings and the subject (my comment couldn’t send for some reason)
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Question: Will energy always be measured in joules or is there some other way to measure energy? If so, how would you measure energy in that other way?
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