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6 chemistry teachers in Mecca

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6 chemistry teachers in Mecca

د. وليد - Mecca41€
41€Thermal changes accompanying physical and chemical changes
Trusted teacher: Thermal changes accompanying physical and chemical changes Thermal changes accompanying physical changes - melting temperature It is the temperature change when one mole of solute is dissolved in a given amount of solvent (The amount of heat energy absorbed or released when one mole of solute is dissolved in a given amount of solvent). During the dissolution process: two processes occur: A- Dissociation: the breaking of bonds (endothermic reaction) Sodium and chloride ions dissociate from the crystal lattice as a result of the ionic bond breaking. The energy absorbed to break the bond is called the heat of the crystal lattice (bond energy). - Crystal lattice temperature: It is the energy needed to break the bond between ions in the crystal lattice. B- Hydration: The dissociated ions bind with water molecules to form hydration ions (exothermic process). Rehydration temperature: It is the amount of heat released when hydrating ions bind to water molecules. If the crystal lattice temperature > heat of hydration Dilution temperature: It is the heat change per mole of solute when diluted from a concentrated solution to a dilute solution. (It is the heat change of one mole of solute when diluted in a large amount of water (about 1000 moles of solvent)). Sedimentation temperature: The amount of heat released when one mole of an insoluble substance is completely precipitated. - heat of combustion It is the amount of heat released when one mole of a substance is completely burned in an abundance of oxygen. (The reaction is always exothermic). Formation temperature: It is the amount of heat released or absorbed when one mole of a compound is formed from its elemental elements so that the elements are in their standard state. (at 25 °C, a pressure of 76 x g). Note: Heat of formation of the elements = zero
Chemistry · Physics · Science
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Our students from Mecca evaluate their Chemistry teacher.

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Only reviews of students are published and they are guaranteed by Apprentus. Rated 4.8 out of 5 based on 233 reviews.

Private lessons in Math, Physics, Chemistry and SVT (Luxembourg)
Raef
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so lucky to have found this amazing teacher! He explains everything with so much patience and clarity that even the most difficult topics start to feel simple. I noticed a big improvement in my maths level and I love the most how encouraging and supportive he is—he never makes you feel bad for not understanding, instead he finds new ways to explain until it clicks. Thanks to him, I’ve gained so much confidence in maths and I actually enjoy learning now. If you’re looking for a tutor who truly cares about his students’ success, I highly recommend him!
Review by NAGHAM
Cambridge International GCSE: Biology / Chemistry / Physics / Mathematics (Tokyo)
Benson
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After my first lesson with Benson, i have felt more confidence in my skills with chemistry than i have in many years. Where I previously felt very subconscious and unable to answer questions, i have now been able to answer difficult IB exams questions with ease. Benson provided me a safe and comfortable environment which has left me excited for my next class at school to show what i have learned with a fresh confidence! I highly recommend this tutor to anyone who struggles with confidence in both themselves and their subjects.
Review by TIA
Scientific subjects (Math, Physics, Chemistry) for students of the French mission/for middle and high school students (Casablanca)
Amin
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rating green star
So far, I've been getting help with my IGCSE 's in Math and Computer Science with Amin. In most of the lessons I've been with him, he's been really helpful and responsible. He has also been very patient. He helps me become more confident in my answers and makes the lessons pretty fun! After my lessons with him, I do understand my topics more and am able to go to my classes in school without feeling lost. If you're ever struggling with Physics or Programming, I'm sure he can help you too :)
Review by MANIJ

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