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O Level Chemistry Tuition Singapore/Tuition O Level Chemistry/Tutor
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O Level Chemistry Tuition Singapore/Chemistry O Level Tuition/Tutor
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O Level Chemistry Tuition Singapore/Chemistry O Level Tuition/Tutor
Chapter 1 – Kinetic Particle Theory
1. Explain why a solid have a fixed shape and volume using kinetic particle theory.
The particles of a solid are held together by very strong forces of attraction. They cannot move freely, and have only enough kinetic energy to vibrate and rotate about their fixed position.
2. Explain why a liquid does not have a fixed shape using kinetic particle theory.
The particles of a liquid are held together by weaker forces of attraction as compare with solid. They are arranged in a disorderly manner and can move freely by sliding over one another. Thus liquild does not have a fixed shape and take the shape of the container.
3. Explain why during the melting process, the temperature of the substance does not rise even though heating continue.
The temperature remains constant because all the heat energy taken in by the particles is used to overcome the forces of attraction holding the particles. A mixture of solid and liquid phases exist here.
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O Level Chemistry Tuition Singapore/Chemistry O Level Tuition/Tutor
Chapter 2 – Measurement and Experimental Techniques
Collection of Gases
1) Displacement of water is suitable for collecting gases that are insoulble or slightly soluble in water.
Example: CO2, H2, O2
2) Downward delivery should be used to collect gases that are soluble in water and denser than air.
Example: Cl2, HCL
3) Upward delivery is used to collect gases that are soluble in water and less dense thar air
Example: NH3
From Pure Chemistry Tutor
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O Level Chemistry Tuition Singapore/Chemistry O Level Tuition/Tutor
Chapter 3 – Purification and Separation
How to determine that a substance is pure?
If the substance has a fix melting and boiling point, the substance is pure. We can also use chromatography to check for pure substance.
From : O Level Chemistry Tutor
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