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26 private teachers in Mecca

د. وليد - MeccaC$67
C$67Thermal 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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Ms.Ayesha - MeccaC$38
C$38From junior to senior level Grade Kg to Professional /College/university
Summary: My name is Ayesha. I am a visionary professional yet friendly in teaching a wide range of ages from 1 year old, to adults. I have taught students from all over the world with various interests and reasons to learn English and other subjects like Science, Social studies, primary Math, International Relations, Political Science, Islamiah, Chemistry and Biology. As a teacher, I strive to be patient, clear and empower my students to speak English confidently and fluently. I have worked as a teacher, a central office administrator, coordinator, and an online tutor. My unforgettable moment of achievement was receiving the best teacher of the month award. Academic credentials: I hold a degree in Master of English, Bachelor of Science subjects included Chemistry, zoology, Botany and English. I have got another degree that is Bachelor of Education. Highlights: I love teaching, and I am committed to the individual's learning development, as well as the development of their personalities and fine motor skills. I have a good understanding of all teaching methods and learning styles. Able to convey material to students in an easy-to-understand manner. Assists students with homework questions and test preparation strategies. Excellent interpersonal and assessment skills. I really like to tailor my teaching approach to the student’s needs. I identify the needs of learners and if necessary adapt course content and deliver style to meet their needs. Assist with homework and other class assignments. Develop academic strategies to improve student self-sufficiency. Create lesson plans, review worksheets, and practice tests to prepare students for weekly tests. Assist students in acquiring better understanding of targeted weak areas within a subject or a subject as a whole. Develop action plans based on students' and educators' academic goals Communicate with parents and teachers to update them on students' progress. Individualizes tutoring for students according to content tutoring needs assessments. Toast the best class with me !
English · Science · Social studies
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