GCSE Chemistry - Compounds, Molecules & Mixtures (2026/27 exams) скачать в хорошем качестве

GCSE Chemistry - Compounds, Molecules & Mixtures (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. Introduction to how atoms exist Key terms: molecules, compounds, and mixtures 2. Molecules Definition: Two or more atoms held together by chemical bonds Examples of molecules made from single elements (e.g., oxygen, nitrogen, chlorine) Examples of molecules made from different elements (e.g., water, carbon dioxide) Clarification that single atoms (e.g., helium) are not molecules 3. Compounds Definition: Substances containing two or more different elements chemically bonded Relationship and distinction between molecules and compounds Characteristic: Elements in compounds are always found in fixed proportions Chemical formulas: Representation using symbols and subscripts Understanding more complex formulas and the use of brackets Large (non-molecular) compound structures, such as ionic compounds (e.g., sodium chloride), and how their formulas represent ratios 4. Mixtures Definition: Two or more substances not chemically combined together Characteristics: Components retain their individual properties and are not bonded to each other Separation: Mixtures can be separated by physical methods ** CHAPTERS ** 0:00 Introduction 0:24 What are Molecules? 1:15 What are Compounds? 1:27 How to Distinguish Molecules from Compounds 2:00 Chemical Formulas of Compounds 3:19 Understanding Brackets in Chemical Formulas 3:48 Large Compound Structures 4:57 What are Mixtures? 5:20 Separation of Mixtures ** PLAYLISTS **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #GCSE #Chemistry #study #revision #school #exam #AQA #OCR #Edexcel #IGCSE