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

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*** 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 ***

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