Add to Wish List
Add to Wish List
Trusted teacher
from67.97CAD/ h
Thermal changes accompanying physical and chemical changes
Translated by Google. Click to view original.
Thermal changes accompanying physical and chemical changesThermal 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
Location
At student's location: Around Mecca, Saudi Arabia
|
Use ⊞+wheel to zoom!
Ask a question
Send a message explaining your needs and د. وليد will reply soon:
The more detail, the better.
Ex. "Hi, when are you available to meet for a lesson?"
Ex. "Hi, when are you available to meet for a lesson?"
Availability of a typical week
(GMT -05:00) New York
Mon | Tue | Wed | Thu | Fri | Sat | Sun | |
---|---|---|---|---|---|---|---|
0 | |||||||
1 | |||||||
2 | |||||||
3 | |||||||
4 | |||||||
5 | |||||||
6 | |||||||
7 | |||||||
8 | |||||||
9 | |||||||
10 | |||||||
11 | |||||||
12 | |||||||
13 | |||||||
14 | |||||||
15 | |||||||
16 | |||||||
17 | |||||||
18 | |||||||
19 | |||||||
20 | |||||||
21 | |||||||
22 | |||||||
23 |
from C$67.97At student's home
100% Satisfaction Guarantee
Good-fit Instructor Guarantee
If you are not satisfied after your first lesson, Apprentus will find you another instructor or will refund your first lesson.
Online reputation
- Instructor since October 2022
Availability of a typical week
(GMT -05:00) New York
Mon | Tue | Wed | Thu | Fri | Sat | Sun | |
---|---|---|---|---|---|---|---|
0 | |||||||
1 | |||||||
2 | |||||||
3 | |||||||
4 | |||||||
5 | |||||||
6 | |||||||
7 | |||||||
8 | |||||||
9 | |||||||
10 | |||||||
11 | |||||||
12 | |||||||
13 | |||||||
14 | |||||||
15 | |||||||
16 | |||||||
17 | |||||||
18 | |||||||
19 | |||||||
20 | |||||||
21 | |||||||
22 | |||||||
23 |
from C$67.97At student's home
Good-fit Instructor Guarantee
If you are not satisfied after your first lesson, Apprentus will find you another instructor or will refund your first lesson.
Share
You are here
Similar classes
Afraa
Mathematics, computer, English, science. I teach primary schoolEducation has become a necessity, especially teaching basic subjects such as mathematics, science, and English, subjects that are not difficult to learn or understand. With a little understanding and focus, you will find yourself becoming well acquainted with them, so you must learn and understand them in order to succeed in your professional and academic life.
Raef
Private lessons in Math, Physics, Chemistry and SVTThe math, physics, chemistry, and SVT courses of the French or Swiss program of maturity or university are done by either in-depth explanations or by a quick course and summary of essential needs according to the case of each student supported by exercises from the book or evaluations and exams from other high schools.
A special follow-up program to better prepare for the Terminales session.
So that I can give support courses for the 1st year of university in Mathematics - Analysis - Matrices - Statistics - Algebra - Geometry - Physics - Mechanics - Electricity - Chemistry - Organic Chemistry - Biology, Geology.
My experience is too long and for years I have learned methods for each case and for each student to fill in their gaps with the best results of Excellent, Very Good, and Good as mentioned by my students.
I can also help students to better prepare for courses and support them to better prepare for the duties of CNED in science subjects.
Guaranteed response within minutes up to 10 hours maximum.
Amine
Mathematics and Physics-Chemistry courses on Zoom (high school, maturity, bachelor's degree, etc.)I am a young, passionate teacher with great ease in the areas of mathematics and physics-chemistry. My teaching method is distinguished by my patience and my dedication to the success of my students. I love feeling useful by helping others understand and master sometimes complex concepts.
My sense of humor and my youth are also assets that allow me to create a relaxed and pleasant atmosphere during classes. I firmly believe that learning is most effective when students feel comfortable and confident. I am therefore committed to creating a learning environment where my students feel encouraged to ask questions and explore new concepts.
My top priority is the success of my students. I am committed to providing personalized support and adapting my teaching methods according to the specific needs of each student. I am patient and persistent, and I am willing to explain concepts as many times as necessary until they are fully understood.
Whether you need help solving complex math problems or understanding the fundamentals of physics and chemistry, I'm here to support you throughout your learning journey.
Arianit
Electrical Engineering I and II (Electrical Physics, Basics and Introduction, Electronics)Electrical engineering forms the backbone of today's technology. From the distribution of electricity worldwide to the implementation of microcircuits, electrical engineering describes and provides the fundamentals of all principles pertaining to electronics, telecommunications, power systems, renewable energy, machines and mechatronics, etc. Having graduated as an Electrical Engineer I am offering Electrical Engineering I and II tutorials for beginner students at the University of Applied Sciences Upper Austria. I have experience in elaborating and describing the following thematics which are often problematic for students who seek a degree in Electronics Engineering, Computer Engineering, Telecommunication Engineering, and Electrical Engineering:
•Electrical Engineering Basics
•Conductor, Isolator, and Semiconductor Physics
•AC Passive components: Inductors, Capacitors and Resistors
•DC Circuit Analysis (Thevenin, Kirchhoff and Helmholtz approaches)
•Three-phase systems
•Diodes and the PN Junction
•Transistor Physics: BJT/IGBT/MOSFET
•Operational Amplifiers
•Electronic Circuitry (Buffers, Signal Amplifiers, etc)
•Transformer and Electromagnetics Basics
Stephen
Maths and Science: Physics – Chemistry – Biology (Secondary School)Good morning and welcome on my profile!
I am a passionate and dedicated maths and sciences teacher with over 5 years of experience helping students achieve their academic goals. Whether you're struggling with the basics or advanced concepts, I'm here to support you with patience, clarity, and a deep understanding of math.
-- Teaching Methods --
I pride myself on using innovative, effective teaching methods adapted to every learning style. My approach includes:
• Initial Assessment: Understand your current level and identify your strengths and weaknesses through initial assessments.
• Personalized Learning Plans: Develop a personalized study plan that targets your specific needs and goals.
• Interactive Learning: Use of digital tools, visual aids and concrete examples to make concepts more tangible.
• Problem Solving Techniques: Teach various problem-solving strategies and develop critical thinking skills to approach complex issues.
• Regular Reviews and Practices: Integrate regular reviews and practice sessions to reinforce concepts and improve retention.
• Adaptability: Modify teaching strategies based on your progress and feedback to ensure continuous improvement.
-- Professionalism --
Professionalism is at the heart of my teaching method. I am committed to providing a respectful, caring and structured learning environment. Here's what you can expect from me:
• Punctuality: I respect your time and ensure that our classes start and end at the scheduled time.
• Preparation: Each session is carefully planned to meet your specific needs and goals.
• Constructive Feedback: I provide constructive and rapid feedback to help you understand your progress and identify areas for improvement.
My goal is to make science accessible and exciting, helping you develop a solid understanding of fundamental principles and practical applications. I hope to help you discover the beauty and complexity of the scientific world while achieving your academic goals.
Benson
Cambridge International GCSE: Biology / Chemistry / Physics / MathematicsNothing beats one-on-one lessons.
I am a qualified, experienced, and certified international tutor with a strong familiarity with the Cambridge IGCSE/A-Levels/O-Levels & IB Diploma curricula. I offer both ONLINE and IN-PERSON lessons in PHYSICS, CHEMISTRY, and BIOLOGY, following the British, American, and Indian curricula.
My classes are available at affordable rates and can be conducted in-person or online. I adopt a student-oriented teaching style, striving to provide the best private lessons for my students.
With 6 years of professional experience in science (Physics, Chemistry, and biology), I am well-versed in both the British and American curricula and I possess a high level of competency. I have taught students from various countries, including Belgium, Spain, Switzerland, Japan, the USA, the Caribbean, the UK, India, China, Singapore, Malaysia, Turkey, the Netherlands, Luxembourg, Germany, France, Italy, and South Africa.
Book a lesson with me, and we can start on any day and time that suits you.
Mohamed
Scientific subjects (Math, Physics, Chemistry) for students of the French missionIt is important to me to teach my students while adopting an active teaching method. I put all my experience acquired as a head teacher and also that of my academic career to the service of their success.
My seriousness, my listening and my kindness allow me to overcome difficulties and excel in:
- Math,
- Chemical Physics,
My courses are aimed at students:
- the French system from 6th to Terminale
- French mission schools
(Speciality: Mathematics, PC).
Ayoub
Physics-Chemistry, Maths courses (French mission program)My goal is to help my students progress and succeed in their exams.
So that they can overcome their difficulties, I provide them with effective educational support, on an ad hoc basis or throughout the school year.
Concretely, I analyze my student's profile then identify their gaps and/or difficulties to finally implement tailor-made methodologies.
My teaching is aimed at students from 6th to 12th grade, all sectors combined.
I assure you that with weekly monitoring and the right methods you will make progress!
Farid
Qualified Science teacher. Specialised in IB Physics, Biology and ESSPassionate and Experienced Science Tutor
As an accomplished science educator with extensive teaching experience, I offer comprehensive tutoring services that bring science to life. Specializing in International Baccalaureate (IB) curricula, I provide expert guidance in Biology, Physics, and Environmental Systems and Societies (ESS). My approach goes beyond textbook learning, combining deep scientific knowledge with engaging pedagogical techniques.
With a commitment to personalized learning, I create supportive and dynamic learning environments that inspire curiosity and scientific thinking. My teaching philosophy is rooted in patience, friendliness, and a genuine passion for scientific exploration. Whether you're struggling with complex concepts or seeking to excel in your studies, I'm dedicated to helping students unlock their full potential.
My expertise spans multiple science syllabuses, ensuring flexible and comprehensive support for students at various academic levels. Drawing from my love of nature, outdoor sports, and traveling, I bring real-world context and excitement to scientific learning. I believe that science is not just a subject to be studied, but a lens through which we can understand and appreciate the world around us.
Let's embark on a scientific journey together – where learning is engaging, meaningful, and transformative.
Zhasmin
GCSE Chemistry, Biology and Maths Masterclass - Ace your GCSEs!While I am passionate about my subjects, I understand that not everyone is ecstatic about studying. There's no point teaching simultaneous equations to a struggling student if it isn't on the GCSE Maths Foundation syllabus!
Depending on grade that the student is aiming for/predicted I will:
●spend the first lesson with students going through their exam board syllabus, make it explicit what content is the core of the course content and structure lessons in descending importance
● (for higher level students) spend the first lesson with students going through their exam board syllabus, identify the weakest links and structure lessons in ascending order of skill
I believe in spaced repetition so revisiting topics taught before is a must!
This will manifest in the form of:
●surprise questions during the first 10 minutes of lessons
●helping prepare and working through past papers when it comes closer to exam time to encourage active recall.
During normal lessons, there will be a mix of:
●theoretical teaching
●helping the student digest, understand and store useful information that has been presented
●visual aspects (diagrams)
In order for students to efficiently absorb knowledge, I will teach one core topic per lesson.
Top Tip if you want to get the most from me: Ask questions! I aim to have a friendly environment in lessons, I am not your teacher - I am your helper!
Anas
Private lessons in math - physics - chemistry - engineering scienceHello dear students and participants,
As a former teacher, I had the privilege of supporting more than 40 students over the past year in their academic progress. I teach the following subjects: mathematics, physics, chemistry, engineering sciences and Excel. Thanks to my personalized and structured approach, I help my students develop their skills, their self-confidence and their autonomy.
By working with me you will learn:
*Effective resolution methods,
*Intensive practice of exercises,
*Educational coaching adapted to your needs,
*The development of summary revision sheets,
*Career guidance to inform your future choices,
*Practical practical work in engineering sciences, to anchor concepts in reality.
At the same time, as an information technology consulting engineer, I have in-depth expertise in the technical field, with the ability to design and implement innovative solutions in complex environments.
Passionate about aeronautics and piloting aircraft, I cultivate essential qualities such as rigor, discipline and rapid decision-making in dynamic environments. This passion fuels my teaching by adding a practical and inspiring perspective.
Patrick
Come and learn Biology and Chemistry with an expert. Book now and have your best experience.In the IGCSE and CIE (AS/A Level) Biology and Chemistry curricula, Organic Chemistry is a major topic, particularly within Chemistry. Here's a breakdown of what is covered at each level:
---
IGCSE Chemistry (Cambridge - 0620/0971)
In IGCSE, Organic Chemistry focuses on the fundamentals of carbon compounds and their reactions. Key areas include:
1. Introduction to Organic Chemistry
- Definition: Organic chemistry is the study of carbon-based compounds.
- Hydrocarbons: Compounds made up of carbon and hydrogen only.
2. Types of Hydrocarbons
- Alkanes:
- General formula: CnH2n+2
- Properties: Saturated hydrocarbons (single bonds).
- Combustion and substitution reactions.
- Alkenes:
- General formula: CnH2n
- Properties: Unsaturated hydrocarbons (double bonds).
- Addition reactions (e.g., with bromine water as a test for alkenes).
3. Functional Groups and Homologous Series
- Alcohols: General formula CnH2n+1OH (e.g., ethanol).
- Properties and combustion.
- Carboxylic Acids: General formula CnH2n+1COOH(e.g., ethanoic acid).
- Weak acids, their reactions, and uses.
4. Polymers
- Addition Polymerization: Formation of polymers from alkenes (e.g., poly(ethene), poly(propene)).
- Natural and Synthetic Polymers: Proteins, nylon, and plastics.
- Environmental Issues: Problems with non-biodegradable plastics.
---
CIE AS and A Level Chemistry (9701)
At the AS/A Level, Organic Chemistry is studied in greater depth, with emphasis on structure, reactions, and mechanisms. Key topics include:
1. Structure and Bonding in Organic Compounds
- Structural, displayed, and skeletal formulas.
- somerism:
- Structural isomers.
- Stereoisomerism: cis-trans(E/Z) isomerism.
2. Functional Groups and Reactions
- Alkanes: Combustion and free radical substitution reactions.
- Alkenes: Addition reactions (e.g., hydrogenation, halogenation, hydration).
- Alcohols: Preparation (hydration of ethene) and oxidation (to aldehydes, ketones, or carboxylic acids).
- Halogenoalkanes: Nucleophilic substitution reactions.
- Carboxylic Acids: Reactions (e.g., neutralization, esterification).
- Esters: Formation and hydrolysis.
3. Mechanisms of Reactions
- Free radical substitution (e.g., in alkanes).
- Electrophilic addition (e.g., in alkenes).
- Nucleophilic substitution (e.g., in halogenoalkanes).
4. Polymers and Biochemistry
- Addition and condensation polymers.
- Structure of proteins and DNA.
5. Organic Synthesis
- Pathways for converting one functional group to another.
- Use of reagents, conditions, and mechanisms in synthesis.
Summary
- IGCSE Organic Chemistry focuses on basic hydrocarbons (alkanes, alkenes), functional groups (alcohols, carboxylic acids), and polymers.
- AS/A Level Organic Chemistry goes deeper into mechanisms, isomerism, synthesis pathways, and advanced functional groups.
Mohamed
Certified High School Mathematics Teacher, Master in Mathematics; teaches math lessonsAs a high school teacher with a Master's degree in mathematics and 11 years of experience in face-to-face and online teaching, I offer qualified and competent private lessons for all levels, ranging from high school TC-SC 1Bac Sc-SM to Bac PC-SM, through middle school and classes of 2nd and 1st general Terminale specialty of the French system, as well as for levels 5th, 4th and 3rd of middle school, and preparation for the baccalaureate and competitions .
I emphasize the method, with a rigorous, personalized approach adapted to the rhythm of each student in order to help him progress while regaining confidence in himself. My job is to identify each student's shortcomings, organize their time and manage their priorities.
I obtained a success rate of 100% for my final year baccalaureate students, 75% of whom obtained a good or very good mention. Some of them have joined the biggest business and engineering schools, as well as prestigious preparatory courses.
I offer online or face-to-face lessons.
Rania
cours particuliers en svt, physique ,chimie et mathmany people face problems while studying scientific subjects , so if you one of them and you need a small or big help , I am here to help you to face any obstacle you may have in the matter.
I am a medical student at the medecine school of tunis.
science has always been a passion of mine.
so I intend to make a personalised plan to each student according to his difficulties and help him overcome them step by step .
Robert
Physics / Chemistry / Bio, at your place, at my place or remotely!As a Franco-Belgian teacher, I offer private lessons in physics, chemistry and biology for secondary and higher levels. I specialize in secondary level up to 5th year Belgian.
I travel, if necessary, to your home in the Brussels region as well as in Walloon and Flemish Brabant, with a minimum course duration of 2 hours. With extensive experience, I offer numerous exercises to consolidate knowledge. Distance learning is also possible via platforms such as Skype, Facebook, etc. For students in France, lessons are done exclusively remotely.
Do not hesitate to contact me to organize your lessons according to your needs and availability. I am here to help you strengthen your skills in these subjects in an effective and personalized way. Courses tailored to your needs will allow you to progress quickly.