This presentation talks about the application of Law of Conservation of Mass to Chemical Equations. It has a step-by-step process of balancing equations with a bit of mole-mass conversions.
This presentation talks about the application of Law of Conservation of Mass to Chemical Equations. It has a step-by-step process of balancing equations with a bit of mole-mass conversions.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
2. Why do we need to study chemical energetics? It can lead us to understand a chemical change better. E.g What is the temperature for a reaction to occur. It will also tell us the energy barrier that reactants have to overcome before becoming products.
3. Energetics of chemical reactions Every reactant will have a discrete amount of energy. rearrangement of atoms that occurs in a chemical reaction is virtually always accompanied by the liberation or absorption of heat. Bonds are broken in reactants and bonds are formed in product
4. System and surroundings We will use 2 models to represent reactants and its environments around it. System – Reactants Surroundings – Environment around reactants
5. Exothermic Reaction Heat is given off As a result of this release of heat energy from the system (reactants), the surrounding will have a increase in temperature Energy of reactant < Energy of Surrounding
6. Exothermic Reaction So what happens after heat energy is being released? Products formed will have a energy level lower than reactants. Conservation of energy!
7. Exothermic Reaction Example of Exothermic Reaction Carbon combust under presence of oxygen to produce carbon dioxide. Neutralisation between an acid and alkali 3. Granular Zinc with Tin(II) Chloride. (Metal displacement)
8. Endothermic Reaction heat energy is taken in. System (reactants) take in energy from the surrounding. Surrounding loses heat to the reactants. Energy of reactant > Energy of Surrounding
9. Endothermic Reaction So what happen after heat energy is being absorbed? Product formed will have a higher energy than the reactants. Conservation of energy!
10. Endothermic Reaction Examples Thermal decomposition Hydrated copper (II) sulfate ----> Anhydrous Copper (II) sulfate CaCO3 --------> CaO + CO2 2) Photosynthesis 3)
11. So what do we name the difference in amount of energy between reactants and products? ENTHALPY CHANGE OF REACTION ∆H The Enthalpy change in a reaction has a symbol ∆H.
12. Enthalpy Enthalpy (H) is also known as heat content, is the total energy of a system, some of which is stored as chemical potential energy inside the chemical bonding. Absolute enthalpies for particular states cannot be measured, but the change in enthalpy that occurs during a reaction can be measured – Using a calorimetry
13. Enthalpy ∆H is positive (+) for endothermic reactions. Heat energy is gained by system from the surrounding. Hence the surrounding will a dip in temperature ∆H is negative (-) for exothermic reactions. Heat energy is lost to the surrounding and cause the temperature in the surrounding to rise.
14. Enthalpy For endothermic reaction, final products have a higher energy than the reactants. For Exothermic reaction, final products have a lower energy than the reactants.
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16. These covalent bonds have a specific amount of energy to hold the atoms together
19. How to calculate the enthalpy change of reaction? Step 3: Energy is absorbed by the reactants when bonds are broken. Hence it will be 436KJ + 243KJ = 679KJ Energy is released by product when new bonds are formed. 2 X 432KJ = 864KJ Step4: ∆H = (Energy absorbed when bond are broken in reactants) – (Energy released when bonds are formed in product)
20. How to calculate the enthalpy change of reaction? Step 5: ∆H = (Energy absorbed when bond are broken in reactants) – (Energy released when bonds are formed in product) ∆H = 679KJ – 864KJ = -185KJ
21. Assignment: Chemical Energetics Qn 3a) 2 H-O-O-H ------> O=O + 2 H-O-H ∆H= -206KJmol-1 Thought process: Enthalpy change of reaction already shows that there is a decrease in value as shown in the negative sign. This implies that it is an exothermic reaction. This will also mean that energy from bond breaking(reactants) is less than bond formation (products)
22. Assignment: Chemical Energetics Qn 3a) Answer: The amount of energy absorbed to break 4 O-H bonds and 2 O-O bonds is less than the amount of energy released in forming 1 O=O bond and 4 O-H bonds. b) ∆H = Energy from bond breaking – Energy from bond forming -206 KJ= 2(B.E O-O) + 4(B.E O-H) – [ B.E O=O + 4 B.E O-H] -206 KJ = 2(B.E O-O) + 4(463KJ) – [ 486 + 4(463)] B.E O-O = 140 KJ mol-1
23. Assignment: Chemical Energetics Qn 4: Though process: Strong bond means larger bond energy and weak bond means smaller bond energy. X-X + 3 Y-Y ----> 2XY3 ∆H = Energy absorbedbond-breaking – Energy releasedbond formation = [B.E x-x+ 3B.E Y-Y] – 6[B.E XY] Answer: Exothermic. Less Energy is needed to break the X-X and Y-Y bonds and more energy will be released when forming the X-Y bonds. Enthalpy change will be negative.