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Ch 9 - What Matter is Made Of... Flashcards | Quizlet

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Start studying Ch 9 - What Matter is Made Of.... Learn vocabulary, terms, and more with flashcards, games, and other study tools.

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The temperature at which a material changes from a gas to a liquid; the same as the boiling point

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An example of a chemical change rusting iron, combustion burning of wood,  souring milk and metabolism of food. 

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An example of a chemical change rusting iron, combustion burning of wood,  souring milk and metabolism of food. 

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Solids have a definite shape, volume and cannot be compressed and the molecules are tightly packed.
Liquids have no definite shape, but has a definite volume and cannot be compressed. The molecules in liquids are less packed than that in a solid. Gases have no definite shape or volume, and can be compressed. The molecules are not packed and are randomly arranged.

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There are three main factors to be considered:
1.)  Size of molecules: larger molecules diffuse slower than bigger ones (also it takes more energy/ heat to move bigger molecules)
2.) Temperature: see linked experiment in my other post
3.) The distance between the molecules: it takes longer for a particle to diffuse if it is further away from the point of diffusion than it does for one that is close.

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This experiment shows how time taken for food colouring to diffuse in cold vs. hot water differs!
The outcome is clear:  The diffusion of the ink in hot water takes a lot less time!
This is because the particles of the hot water  have more energy than the ones of the cold water. Molecules move faster when they are heated. The rate of diffusion will increase with the temperature going up.

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Diffusion and Temperature: Water & Pen ink & Vinegar

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This diagram shows a practical that could be used to explain diffusion

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A Closer Look: Chemical Vs. Physical Change

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A Closer Look: Chemical Vs. Physical Change

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Diffusion is the movement of particles from a high concentration to a low concentration.

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Particle Theory of Matter The particle theory of matter states that all matter is made up of tiny particles, specifically atoms and molecules, and that these particles have inherent characteristics. A major part of the theory is the belief that all particles in a single pure substance are the same and are different from particles of other substances.

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Particle Theory of Matter The particle theory of matter states that all matter is made up of tiny particles, specifically atoms and molecules, and that these particles have inherent characteristics. A major part of the theory is the belief that all particles in a single pure substance are the same and are different from particles of other substances.