CHEMICAL ENERGETICS
Presentation
•
Chemistry
•
9th Grade
•
Hard
Sharidah Nadhirah
Used 9+ times
FREE Resource
33 Slides • 0 Questions
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CHAPTER 8: CHEMICAL ENERGETICS
Chemical & Energy
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Energy will start to transfer to or from the environment (surrounding)?
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EXOTHERMIC (EXIT)
Gives out energy
Surrounding temperature rise/increase
The reaction can be described as: reactants = products + energy
formation of new bonds
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EXOTHERMIC (eg:)
combustion of fuels (O2 + gas)
neutralization (acid + base)
respiration in our body
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ENDOTHERMIC(ENTER)
Take in energy from the surrounding
Surrounding temperature fall
The reaction can be described as: reactant + energy = products
Since energy is absorbed products must have higher energy than reactants.
Bonds breaking
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ENDOTHERMIC (eg)
reactions that take place in cooking
photosynthesis: plants absorbed sunlight energy to convert CO2 + H2O = Glucose
ice melting
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BOND ENERGY CALCULATION
Each chemical bond has a specific bond energy
This is the amount of energy require to break or form the bond
This energy can be used to calculate how much heat would be released or absorbed in a reaction
Identify bond present in reactants & products
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CHAPTER 8: CHEMICAL ENERGETICS
Chemical & Energy
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