Crossbreeding, its conditions and types, a lesson for the secondary stage, the second grade

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Hybridization in chemistry is an important source for obtaining a new chemical compound that has strong properties and conditions that it must be between two orbitals or more close in energy to complete the hybridization process. Type SP2 is ethylene and its chemical formula is C2H4. Examples of hybridization are type SP acetylene and its chemical formula is C2H2. This lesson is brief.

Extra information

Yes

Location

Online from Egypt

Age

Children (7-12 years old)

Teenagers (13-17 years old)

Adults (18-64 years old)

Seniors (65+ years old)

Student level

Beginner

Intermediate

Advanced

Duration

30 minutes

45 minutes

60 minutes

The class is taught in

Arabic

English

Skills

Science

Chemistry

Availability of a typical week

(GMT -05:00)

New York

Online via webcam

Mon

Tue

Wed

Thu

Fri

Sat

Sun

00-04

04-08

08-12

12-16

16-20

20-24

Raef

4.73

(137)

An experienced teacher with degrees from the Faculties of Science and Medicine for over 18 years offers private tutoring at home or online using a modernized method in Mathematics, Analysis, Matrices, Statistics, Algebra, Physics, Chemistry, and Biology, following the French curriculum, for students in their final year of high school (Terminale), penultimate year of high school (1ère), second year of high school (Seconde), Brevet exam preparation, competitive entrance exams, and university preparatory classes. Also available for students in the IB international program (taught in English).
Program and prices specific to the countries of South America which ends their program later where I can be there with help to better prepare CNED's homework
My final year students' results were with the grades VERY GOOD, GOOD and EXCELLENT.
Feel free to contact me for more information; I will reply within minutes at 12 PM.

Amin

4.73

(137)

Struggling with math, physics, or chemistry? You're not alone — these subjects are hard, and classroom explanations are rarely enough.
I offer personalized tutoring for middle school, high school, and early university students following the French Mission curriculum, the Moroccan national curriculum, or the international baccalaureate.
Topics covered:

Mathematics: algebra, geometry, calculus, trigonometry, probability
Physics: mechanics, electricity, optics, thermodynamics
Chemistry: organic, inorganic, stoichiometry, reactions

My approach:
I don't re-explain the textbook — I identify exactly where your understanding breaks down and fix it from there. Each session is built around your specific difficulties, not a preset program.
I completed CPGE (Classes Préparatoires aux Grandes Écoles) in Mathematics and Physics before graduating as a State Engineer — I know these subjects at an advanced level and I know where students typically get lost.
Individual and small group sessions available. Online (worldwide) in French, Arabic, or English.

4.73

(137)

Are you an IB Chemistry HL or SL student aiming for a higher grade and greater confidence in exams?

This course provides **structured, exam-focused IB Chemistry tutoring** designed to strengthen your understanding, improve problem-solving skills, and prepare you effectively for IB assessments.

With **10+ years of experience teaching international Chemistry curricula**, I help students move beyond memorizing content and learn how to apply Chemistry accurately to unfamiliar questions and IB-style problems.

### What We Cover

**IB Chemistry HL & SL**

* Complete syllabus coverage and targeted revision
* Concept clarification and deeper understanding
* Stoichiometry and quantitative calculations
* Organic Chemistry and reaction mechanisms
* Energetics and thermochemistry
* Kinetics
* Equilibrium
* Acids, bases and pH
* Redox reactions and electrochemistry
* Data-based and unfamiliar exam questions
* Past-paper practice and mark-scheme analysis
* Common mistakes and examiner expectations
* Exam timing and answer-structuring strategies

### IB Chemistry IA Support

Students can also receive structured guidance with their **Internal Assessment**, including:

* Developing and refining a suitable research question
* Discussing experimental design and methodology
* Data processing and uncertainty analysis
* Interpreting results
* Evaluation and conclusion
* Improving scientific reasoning and communication

IA support focuses on **guidance and feedback**, helping students understand how to develop and evaluate their own work.

### My Teaching Approach

Lessons are **structured, focused and personalized** according to the student's current level and target grade.

Students learn to:

* Understand Chemistry rather than simply memorize it
* Apply concepts to unfamiliar situations
* Solve calculations accurately and systematically
* Interpret graphs, tables and experimental data
* Structure answers according to IB expectations
* Learn from mark schemes and past-paper questions
* Identify and correct recurring mistakes
* Build confidence under exam conditions

Each student receives a **personalized study plan** based on their strengths, weaknesses, upcoming assessments and target grade.

Whether you are struggling with a particular topic, preparing for exams, or aiming to move from a good grade to an excellent one, the lessons are tailored to your specific needs.

Chiwila

4.73

(137)

As a dedicated tutor with extensive experience in preparing students for standardized exams such as the SAT, GMAT, and SSAT, I understand the unique challenges that each of these tests presents. My approach is comprehensive and focuses on building a strong foundation in critical areas such as Mathematics, Quantitative Reasoning, Verbal Skills, and Analytical Writing. Each program I develop is tailored to the specific requirements of the exam, ensuring that students are well-prepared and confident on test day.

Having a deep understanding of the test formats and question types allows me to provide personalized strategies that target each student's individual strengths and weaknesses. I believe that every student has a unique learning style, and my goal is to enhance their test-taking skills while improving their time management. By fostering a supportive learning environment, I aim to boost students' confidence and empower them to achieve top scores.

My tutoring sessions incorporate a variety of effective methods, including real exam questions and timed practice tests. This hands-on approach allows students to familiarize themselves with the types of questions they will encounter, making the actual exam feel less daunting. I teach proven techniques for tackling even the most challenging problems, ensuring that students feel equipped to handle any question that comes their way.

One of the key components of my tutoring is helping students develop effective study habits. I provide guidance on creating a structured study plan that maximizes their preparation time and aligns with their personal goals. This structured approach not only keeps students on track but also helps them build a sense of accountability, which is crucial for success.

In addition to academic preparation, I also focus on the psychological aspects of test-taking. Many students experience anxiety leading up to exams, which can affect their performance. I teach relaxation techniques and mental strategies to help manage stress, allowing students to approach their exams with a calm and focused mindset. By addressing both the academic and emotional challenges of test preparation, I equip students with a well-rounded toolkit for success.

Feedback is an essential part of the learning process, and I make it a priority to provide constructive and actionable insights during our sessions. After each practice test, I conduct a thorough review of the results, highlighting areas for improvement while also acknowledging progress. This continuous feedback loop helps students understand their growth and keeps them motivated throughout their preparation.

My commitment to student success goes beyond just teaching content. I aim to inspire a love for learning and self-improvement in each of my students. Many of my former students have gone on to achieve their academic goals, securing places at prestigious universities and programs. Their success stories are a testament to the effectiveness of my tailored approach and the dedication I bring to each tutoring session.

If you're looking to master the SAT, GMAT, or SSAT with confidence, I invite you to book a session now. Together, we will develop a customized learning plan that suits your individual needs, ensuring that you are not only prepared to face the test but also equipped to excel and reach your highest potential. With my guidance and your commitment, we can achieve outstanding results. Let’s embark on this journey to success together!

Dr.

4.73

(137)

Hello, I'm Pratibha, a PhD-qualified Biology and Chemistry tutor based in the Netherlands.

I have more than 10 years of teaching experience at secondary and university level. I help students understand Biology, Biochemistry, Biotechnology, Pharmacology and Chemistry, so they can do well in exams and feel confident in the subject. I teach online, and students from the Netherlands, Europe and the rest of the world are welcome.

What I teach
Secondary and pre-university: Biology and Chemistry for IB, A-Level, IGCSE, AP and other international curricula
University: Biochemistry, Molecular Biology, Immunology, Genetics, Microbiology, Zoology and Biotechnology, all the five branches of Chemistry
Exam preparation: past papers, exam technique, revision plans and last-minute support
Homework and coursework help: including lab reports, essays and internal assessments

About my background
PhD in Zoology, MSc in Biotechnology (Core subject- Chemistry) and MSc in Zoology (Gold Medalist)
Former Assistant Professor, with experience teaching both school and university students
Published researcher in preclinical pharmacology, with a recent poster presentation at AIBIA2025 in Utrecht
Experience guiding student research projects and designing lab activities that link practical work to theory
Fluent in English, with working knowledge of French and native-level Hindi

How my lessons work
Concepts first: I explain the "why" behind each topic, so you are not just memorising.
Tailored to you: Every student starts with a short chat about their level, goals and syllabus, and I build the lessons from there.
Interactive: I use diagrams, worked examples, practice questions and digital materials, and I give clear feedback after each lesson.
Exam-focused: We practise how to read questions, structure answers and manage time under pressure.
Supportive and patient: All levels are welcome, from students who are struggling to those aiming for top grades.

Who I can help
Students who find Biology or Chemistry difficult and want to build confidence
IB and A-Level students aiming for top grades
University students who need help with Biochemistry, Molecular Biology or Immunology
Students who need help with revision, past papers or coursework

Book a lesson. Message me with your level, subject, exam board and goals, and we will plan your first lesson together. I look forward to helping you succeed.

Location of the Lessons: Live, interactive, and high-quality sessions delivered online—learn from home in the Netherlands or anywhere worldwide, Face to face- at your home or at my place.

Iskander

4.73

(137)

I hold a Doctorate in Pharmacy and 2 Masters degrees from the University of Paris V René-Descartes.
Since the beginning of my higher education, and since I established myself as a freelancer after 10 years of managerial career in the pharmaceutical industry, I have been used to regularly giving private lessons to pupils and students of all levels, Primary, Secondary and Higher, supporting them until they pass their exams.
The main disciplines in which I support students are essentially scientific.
The perspectives provided are transdisciplinary.

Tony

4.73

(137)

I graduated with a perfect 45/45 in the IB Diploma and achieved 7/7 in both Biology HL and Chemistry HL. I also have over 3 years of teaching experience.
In this class, I’ll share the strategies, techniques, and exam approaches that helped me achieve those results.
This class is focused on more than simply reviewing the syllabus. We will focus on how to approach IB science questions, apply your knowledge effectively, maximize marks, and consistently perform at a 6–7 level.

What we will focus on:
- How to approach difficult IB-style questions
- Strategies for moving from a 5 to a 6 or from a 6 to a 7
- How to understand command terms and what questions are really asking
- How to structure answers to maximize marks
- Data analysis, graphs, calculations, and experimental questions
- Common mistakes that cost students marks
- Time management and exam strategy
- Challenging 6–7 level Biology HL and Chemistry HL questions

We will work through challenging IB-style Biology and Chemistry questions step by step, focusing not only on what the correct answer is, but why the markscheme awards marks for it and how to recognize similar questions in an exam.
Whether you are currently working toward a 6, trying to push from a 6 to a 7, or simply want to become significantly stronger in IB Biology HL or Chemistry HL, this class will give you a clear and practical strategy for maximizing your exam performance.

Ziad

4.73

(137)

I offer personalized academic support in Mathematics, Physics, Chemistry, and Biology for secondary and high-school students. Whether the goal is to strengthen fundamental concepts, overcome specific difficulties, improve problem-solving skills, prepare for tests and exams, or simply gain confidence in a subject, each lesson is adapted to the student’s curriculum, level, objectives, and learning pace.

Learning science is about much more than memorizing formulas, definitions, and procedures. My approach focuses first on understanding: identifying what really matters, connecting different concepts, developing logical reasoning, and learning how to approach a problem step by step. The objective is not only to improve academic results, but also to help students become more confident, curious, and independent learners.

Depending on the student’s level and curriculum, I can provide support in:

¤ Mathematics — algebra, equations and inequalities, functions, sequences, geometry, trigonometry, vectors, limits, derivatives, integrals, probability and statistics
¤ Physics — mechanics, motion and forces, energy, electricity, electromagnetism, waves, optics, thermodynamics, atomic and modern physics
¤ Chemistry — atomic structure, chemical bonding, reactions, stoichiometry, solutions and concentrations, acids and bases, oxidation-reduction, thermochemistry, kinetics and introductory organic chemistry
¤ Biology — cell biology, genetics and DNA, molecular biology, human physiology, reproduction, evolution, ecology and basic biochemistry

I hold a PhD in Physics and have a broad academic background in physics, mathematics, applied sciences, and experimental research. My scientific training allows me to connect concepts across different subjects and, whenever useful, relate what students learn in class to concrete examples, experiments, technology, and real scientific applications.

Lessons are adapted to the student’s own school program and materials and can be provided in English or French, with explanations in Arabic whenever helpful.

Bader

4.73

(137)

French
The law can seem difficult: technical vocabulary, lengthy texts, demanding legal reasoning. My goal is to make it clear and accessible, in the language that suits you best: Arabic, French, or English.

This course is aimed at law students (Bachelor's, Master's), candidates for competitive exams and professionals who want to strengthen their foundations.

You will learn to :

Understanding the fundamental concepts (civil law, criminal law, business law, constitutional law, etc.)
Mastering the methodology: essay, case commentary, practical case
Use legal terminology in all three languages
Prepare effectively for your exams and competitions

Each session is tailored to your level, your program and your goals.

🇬🇧 English
Law can feel hard: technical vocabulary, long texts and demanding legal reasoning. My goal is to make it clear and accessible, in the language that suits you best: Arabic, French or English.

This course is for law students (bachelor's, master's), exam candidates and professionals who want stronger foundations.

You will learn to:

Understand core concepts (civil, criminal, business and constitutional law...)
Master legal method: essays, case comments and case studies
Use legal terminology in all three languages
Prepare effectively for your exams

Each lesson is tailored to your level, your syllabus and your goals.

🇲🇦 Arabic
قد يبدو القانون صعباً: مصطلحات تقنية، نصوص طويلة، وتفكير قانوني دقيق. هدفي هو جعله واضحاً وسهلاً، باللغة التي تناسبك: الفرنسية أو الإنجليزية.

هذا الدرس موجه لطلبة القانون (الإجازة والماستر)، والمترشحين للمباريات، والمهنيين الراغبين في تقوية معارفهم.

ستتعلم:

فهم المدني، الجنائي، قانون الأعمال، الدستوري...)
Use: الحالات العملية
استعمال المصطلحات القانونية باللغات الثلاث
التحضير الجيد للامتحانات والمباريات

كل حصة مكيفة حسب مستواك وبرنامجك وأهدافك.

Esosa

4.73

(137)

Are high school or university STEM courses feeling overwhelming? Whether you're aiming for A/A grades in your secondary school board exams or striving to master foundational university coursework, this class is structured to make complex concepts intuitive, manageable, and scoring-friendly.

Who This Class Is For?
Secondary / High School Students (Ages 12–18): Preparing for WAEC, GCSE, IGCSE, SAT, A-Levels, IB, or national high school exit exams.

Early University Undergraduates: Taking 100/200-level foundational courses in General Chemistry, University Physics, Calculus, Linear Algebra, or Applied Mathematics.

Students Needing Exam Prep or Score Recovery: Turning struggling scores into distinction-level performance with structured problem-solving tactics.

Grace

4.73

(137)

Interactive K-12 Mathematics & Grades 7–12 Science Lessons

Is your child struggling with complex math formulas, needing homework support, or preparing for major science exams?

I am a TRCN-licensed Educator, Tutor Success Manager, and STEM Specialist with over a decade of experience helping students build confidence and achieve top grades. With a First Class / 2:1 degree in Information Technology, a Post Graduate Diploma in Education (PGDE), and advanced MSc IT coursework, I deliver structured, visual, and highly interactive online lessons customized to every student’s learning pace.

What We Cover in This Class:

Mathematics (Grades 1–12): Foundational arithmetic (CPA approach), fractions, word problems, algebra, indices, logarithms, coordinate geometry, linear graphs, quadratic equations, and trigonometry.

Sciences (Grades 7–12): Integrated/General Science, Physics (Scalar and Vector Quantities, Kinematics, Mechanics, Energy Transformations, Waves), Chemistry, and Biology.

How Lessons Are Taught:

Conceptual Clarity over Rote Learning: I break down abstract topics into easy-to-understand visual steps so students master the why behind every formula.

Interactive Digital Classroom: We utilize live interactive whiteboards (OpenBoard, Miro) and dynamic practice tools (Google Forms, Quizizz) to keep students fully engaged throughout every session.

Tailored Pace & Regular Feedback: Lessons are customized to match school curricula, reinforce class topics, support with homework, and provide parents with clear progress updates.

Whether your student needs early math intervention or advanced high school science mastery, I am here to make learning intuitive and rewarding.

Book a trial session today, and let’s unlock your student's potential in Math and Science!

Jean

4.73

(137)

Are you stuck on a chapter, do you want to practice for the baccalaureate exam, or do you have some catching up to do? I can help you online, with a clear method.

MY JOURNEY
- Graduated with honors from the baccalaureate
- 4 years of studying fundamental computer science in Russia, which deepened my mathematical knowledge
- Background in software engineering
- Bachelor's degree in psychology (2015): it helps me understand how each student learns

MY METHOD
- First lesson: I diagnose your weaknesses and the real cause of the blockage
- Each course is built based on this diagnosis
- For each chapter: lessons, examples, then exercises of increasing difficulty
- Practice with typical baccalaureate exam questions and expected writing style
- Work plan adapted to your pace

RESULT
One of my students obtained the highest honors in the 2026 baccalaureate exam, with a score of 17 in Mathematics.

WHAT I WORK ON WITH YOU
Analysis (sequences, limits, differentiation, integrals), probability, geometry, and preparation for the baccalaureate exams.

Write to me indicating your level, your difficulties and your availability.

Tapera

4.73

(137)

Online Worldwide | Primary to High School (Grades 3-12) | IGCSE | GCSE | High School Diploma
Struggling with Math? I make Math simple, clear, and exam-focused.
I teach: Algebra, Geometry, Trigonometry, Statistics, Calculus Basics, Word Problems, Past Paper Practice.
My method:
Diagnose weak areas in first lesson. Explain concepts with simple examples. Practice with graded exercises + homework help. Weekly progress tracker for parents. I have helped students jump 2-3 grades in one term. Whether you need foundation, homework support, or IGCSE/GCSE final revision, I will help you pass with confidence.
Platforms: Zoom / Google Meet / WhatsApp Video
Languages: English & Setswana
First lesson: Assessment + consultation!
Book now and boost your grade.2. ENGLISH DESCRIPTION - For English Class Title to use: English Tutor - Grammar, Essay Writing & Fluency - IGCSE & High School
Description:
Online Worldwide | Primary to High School | IGCSE English Language & Literature | GCSE
Confident English = Confident Student. I help you write better, speak clearly, and score higher.
I teach:
Grammar & Vocabulary | Essay Writing (Descriptive, Narrative, Argumentative)Comprehension & Summary Literature Analysis | Speaking & Presentation Skills | IGCSE / GCSE Exam Techniques. Each lesson: Clear explanation + Model essay + Your writing + My feedback within 24 hours.
Perfect for: ESL learners, primary students, high school students, adults, IGCSE/GCSE candidates.
Let's make English your best subject. Book your first today! 3. SCIENCE DESCRIPTION - For Science Class Title to use: Science Tutor - Biology, Chemistry, Physics - High School & IGCSE
Description:
Online Worldwide | Combined Science | Biology | Chemistry | Physics | IGCSE | GCSE
Science made easy with diagrams, real-life examples, and exam answers that get marks.
I teach:
Biology: Cells, Genetics, Ecology, Human Body; Chemistry: Atoms, Reactions, Periodic Table, Practicals; Physics: Forces, Energy, Electricity, Motion; Combined Science & General Science (Grades 6-12). What you get:
Visual lessons, simplified notes, past paper Q&A, practical demonstrations, exam technique (how to answer 6-mark questions).
I help students who say "I don't understand Science" become students who say "Science is easy!"
Suitable for IGCSE, GCSE, BGCSE, and all High School curricula.
Book your assessment.4. ICT / COMPUTER DESCRIPTION - For ICT Class (Highest Pay)Title to use: ICT & Computer Science - MS Office, Coding, IGCSE ICT - Online Worldwide
Description:
Online Worldwide | ICT | Computer Science | Digital Skills | IGCSE ICT | Beginners to Advanced
From computer basics to coding - I teach ICT for school, work, and the future.
I teach:
Computer Basics & Digital Literacy; Microsoft Office: Word, Excel, PowerPoint (Advanced formulas, presentations); Internet & Email Skills; IGCSE ICT Theory & Practical (Spreadsheet, Database, Document Production); Intro to Coding: Scratch & Python for Kids/Teens; Computer Skills for Adults & Students. Perfect for: Primary students, high school students, IGCSE ICT exam prep, adults needing work skills, beginners with zero experience.
Lesson style: Screen-share, hands-on practice, take-home tasks, step-by-step notes.
No jargon. 100% practical. You will use the computer confidently after 3 lessons.
Platforms: Zoom with screen share
Start today - First lesson includes a ICT skills assessment! Availability: Flexible - I teach across time zones (Africa, UK, Europe, USA) | Message me on Apprentus to schedule your time in Gaborone time (CAT).

Ahmad

4.73

(137)

Are you preparing for the Lebanese Baccalaureate and can follow the steps, but don’t know why they work? This class is for Grade 10 to 12 students who want to understand Math and Physics, not just memorize them.

I’m a PhD candidate in mechanical engineering with a Diplôme d’Ingénieur and 5 years of teaching experience. We start with a problem you find difficult, and I find exactly where your reasoning breaks. Then we work together, like colleagues, to understand the method and connect it to real life or to something you care about.

You will learn to:
Understand the reason behind each method
Solve unfamiliar questions on your own
Apply what you learn to past official exam questions
Feel calmer and more confident before exams
Make a clearer decision about your university path

AI can now solve almost any homework problem in seconds. But it won’t sit your exam for you. In this class, you learn how to study, how to think through new problems, and how to use tools like AI to reach your own goals.

Maryam

4.73

(137)

Hi! If physics is giving you a hard time and you are preparing for your GCSE or IGCSE exams under AQA, Edexcel, or OCR boards, I am here to help you take things from scratch and build complete confidence.
Here is how we go through the entire learning journey together:

Starting from the Basics: When we begin a new topic—whether it is forces, electricity, waves, or energy—we don't just jump into memorizing definitions. We start right from the very basics, breaking down what the concept actually means using simple, real-world logic.

Interactive Visual Learning: During our online session, we work on a shared digital whiteboard. I draw clean diagrams, circuit layouts, and ray optics step by step right in front of you so you can clearly visualize what is happening instead of just imagining it from a book.

Tackling Numericals: Physics formulas and calculations scare many students. We practice numerical problems slowly, learning how to rearrange formulas, substitute values correctly, and check units step by step until solving them becomes second nature.

Exam & Past Paper Practice: Once we finish a chapter, we immediately move to exam-style questions and past papers. We review how examiners mark answers, how to phraseexplanations properly, and how to manage time so you feel fully prepared and calm on your actual exam day.

Drop me a message anytime, and let's talk about which topics you want us to start working on together!