chem

• What is the topic of the video presented by the science teacher?

  The topic is particles and their behavior.
• Why do we use models to represent particles?

  Because particles are extremely small and cannot be seen individually.
• What is a particle?

  A particle is a very tiny object that makes up everything we see.
• How do we typically represent particles in diagrams?

  We draw a sphere to represent particles.
• What affects the properties of materials?

  The properties depend on the particles that make up the material.
• How do the sizes of water and gold particles compare?

  Water particles are quite small, while gold particles are a lot bigger.
• What is the arrangement of particles in a solid?

  In a solid, particles are arranged in neat rows and columns and are touching.
• What happens to particles in a solid when heated?

  They can only vibrate and cannot move freely.
• Can solids be compressed?

  No, solids cannot be compressed.
• How are particles arranged in a liquid?

  In a liquid, particles are still touching but have air gaps and can flow past one another.
• What is the behavior of particles in a gas?

  In a gas, particles are not touching and are free to move randomly.
• What is melting?

  Melting is the process of changing from a solid to a liquid.
• What is evaporation?

  Evaporation is the process of changing from a liquid to a gas.
• What is condensation?

  Condensation is the process of changing from a gas to a liquid.
• What is freezing?

  Freezing is the process of changing from a liquid to a solid.
• What happens to particle energy during melting?

  Particles gain energy, breaking some bonds and allowing more movement.
• What is a heating curve?

  A heating curve shows the temperature change of a substance as it is heated and changes state.
• Why do flat lines appear on a heating curve graph?

  Flat lines indicate that the substance is changing state and requires energy to do so.
• What is diffusion?

  Diffusion is the spreading out of particles from a region of high concentration to low concentration.
• Why can diffusion only happen in gases and liquids?

  Because particles in gases and liquids can move freely, while in solids they are fixed in position.
• What causes gas pressure?

  Gas pressure is caused by gas particles colliding with the walls of their container.
• How can you increase the pressure inside a football?

  By pumping more air particles inside it.
• What happens to gas pressure when the volume is reduced?

  The gas pressure increases because particles collide more frequently with the walls of the container.
• What happens to gas particles when a football is heated?

  The particles move faster, causing more collisions and increasing gas pressure.
• What happens to a football on a cold day?

  The football may feel a little bit more flat due to lower gas pressure.
• What is the effect of standing on a balloon?

  It decreases the volume of air inside, increasing the pressure and potentially causing it to pop.