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## Document Summary:

The document is an educational resource discussing **"Matter in Our Surroundings"**. It covers the fundamental concepts related to matter, including its classification, physical nature, chemical formulae, atoms, molecules, and the purity of matter. It emphasizes the distinction between compounds and mixtures, detailing their differences in formation, properties, and separability. Through experiments and explanations, the document aims to enhance understanding of the basic principles governing matter and its composition, catering to a scientific audience interested in the properties and behavior of substances present in our everyday environment.

Here are some sample questions
1. **Sample Question 1:**
What is the relationship between the molecular formula and the empirical formula of a compound? Provide an example to illustrate this relationship.

2. **Sample Question 2:**
Explain the valencies or charge numbers of ions like Aluminium ion, Magnesium ion, and Nitride ion. Use this information to write down the chemical formulae for Aluminium sulphate and Potassium nitride.

3. **Sample Question 3:**
Calculate the molecular mass in atomic mass units and molar mass of a compound with the molecular formula CH3OH. Given that the atomic masses are H = 1 u, C = 12 u, O = 16 u.