Energetics
Bayani Gaba-gaba
Some reactions release heat and warm their surroundings; others absorb heat and feel cold to the touch. Understanding the energy changes in chemical reactions is essential for everything from choosing fuels to designing hand warmers.
In this lesson you will learn the difference between exothermic and endothermic reactions, how to measure energy changes using simple calorimetry, and how to calculate heat energy using Q = mc delta T.
Manufura
- Know that chemical reactions in which heat energy is given out are described as exothermic, and those in which heat energy is taken in are described as endothermic
- Describe simple calorimetry experiments for reactions such as combustion, displacement, dissolving and neutralisation
- Calculate the heat energy change from a measured temperature change using the expression Q = mcDeltaT
- Investigate temperature changes accompanying salts dissolving in water, neutralisation reactions, displacement reactions and combustion reactions
Taswirar tunani
An zana wannan batu don ka ga yadda ra'ayoyi ke hadewa.
Bude taswirar tunani a cikin manhaja
Katunan tunawa
Gwaji mai sauri kan abin da ake jarraba a wannan batu.
Yi atisayen wadannan katuna a cikin manhaja
Takardar Darasi
Cikakken Bayanin Darasi Yana Kan Manhajar Green Bridge
Sami manhajar Green Bridge CBT a wayarka ko kwamfutarka domin cikakken laburaren IGCSE: takardun jarrabawar baya, tsarin kimantawa, taswirar tunani, katunan karatu da darussan sauti.
Nazarin Darasi
Barka da kammala darasi akan Energetics. Yanzu da kuka bincika mahimman ra'ayoyi da ra'ayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- An exothermic reaction: A) Absorbs heat B) Releases heat C) Has no energy change D) Always involves combustion Answer: B
- The specific heat capacity of water is: A) 4.2 J/g/degrees C B) 42 J/g/degrees C C) 0.42 J/g/degrees C D) 420 J/g/degrees C Answer: A
- Which of these is an endothermic process? A) Combustion of methane B) Neutralisation C) Thermal decomposition of calcium carbonate D) Rusting of iron Answer: C
- In a calorimetry experiment, the temperature of 100 g of water rises by 10 degrees C. The energy transferred is: A) 420 J B) 1000 J C) 4200 J D) 42000 J Answer: C
- A cold pack works because the reaction inside is: A) Exothermic B) Endothermic C) Neutral D) Reversible Answer: B
Yi aikin wadannan tambayoyi a cikin manhaja
Yi aikin wadannan tambayoyi a cikin manhaja
Littattafan da ake ba da shawarar karantawa
Ƙarin koyo daga tushe na buɗe
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Sashen littafi
Energy Basics
Define energy, distinguish types of energy, and describe the nature of energy changes that accompany chemical and physical changes
"Chemistry: Energy Basics" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/5-1-energy-basics. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Sashen littafi
Enthalpy
State the first law of thermodynamics
"Chemistry: Enthalpy" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/5-3-enthalpy. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Energetics? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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Duk abin da kake buƙata don yin fice a JAMB, WAEC & NECO.
