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Learn: States of Matter and the Particle Model
OCR GCSE Chemistry J248
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Welcome!Today we'll learn about states of matter and the particle model. This is an essential topic in chemistry and will help us understand how matter behaves in different conditions. Let's explore step by step!
What are States of Matter?There are three main states of matter: solid, liquid, and gas. These states are determined by how particles are arranged and how they move.
The Particle ModelThe particle model explains the behaviour of particles in solids, liquids, and gases. It shows how particles are arranged, how they move, and how energy affects them.
Quick check: Which statement about solids is correct?
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How Particles BehaveIn liquids, particles are close but can move past each other, which allows liquids to flow. In gases, particles are far apart and move randomly, filling the space available.
Particles in {{blank0}} are far apart and move {{blank1}}.
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Changes of StateSubstances can change between solid, liquid, and gas states. These changes occur due to energy being added or removed, affecting the motion of particles.
Match the items on the left with their correct pairs on the right
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Energy and State ChangesTo change state, energy is absorbed or released. For example, melting ice requires heat to break the bonds between water molecules, turning it into liquid water.
Which process requires energy to be removed?
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DiffusionDiffusion is the movement of particles from an area of high concentration to low concentration. It occurs because particles are always moving randomly, especially in gases and liquids.
Which factors affect the rate of diffusion? (Select all that apply)
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Review Time!Great work! You've learned about states of matter, the particle model, and diffusion. Now let's test your understanding with a few questions.
Which statement about gases is true?
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When energy is added to a solid, it {{blank0}} and becomes a {{blank1}}.
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Which of these are changes of state? (Select all that apply)
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Match the items on the left with their correct pairs on the right
Start the lesson to answer this math equation question
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