Science 7 quarter 1, MATTER

• What is deposition in terms of state change?

  When a substance in gas form changes states to become a solid.
• What is the transformation that occurs during condensation?

  Transformation of water vapour into liquid water.
• What is sublimation?

  Process of turning a solid substance into a gas without going through a liquid phase.
• What happens during melting?

  A solid changes into a liquid when heat is applied.
• What is freezing or solidification?

  Process that causes a substance to change from a liquid to a solid.
• What is vaporization?


  Process in which a substance in a liquid phase changes into a gas phase as the kinetic energy of the molecules increases upon absorbing heat.
• What occurs during boiling?

  A liquid turns into vapor when it is heated to its boiling point.
• What is evaporation?

  Process where liquid gets converted into vapor.
• What are examples of substances that can undergo phase transitions?

  • Water
  • Shampoo
  • Orange juice
  • Coffee
• What are the characteristics of gases?

  Gases have no definite volume and shape, and their particles are widely separated.
• What is an example of a gas?

  Helium in a balloon.
• What are the characteristics of liquids?

  Liquids have a definite volume but no fixed shape, and their particles can move and are in close contact.
• What are the characteristics of solids?

  Solids have a definite shape and volume, with particles that are packed closely together and usually arranged in a regular pattern.
• What defines a pure substance?

  • Made up of only one kind of particle
  • Has a fixed or constant structure
• What are elements?

  Substances composed of only one type of atom.
• What are compounds?

  Substances formed by two or more different types of elements.
• What is matter?

  Anything that has mass and takes up space.
• What are atoms?

  Atoms are the smallest unit of matter and the basic building blocks of matter.
• What are molecules?

  Molecules are made up of multiple atoms.
• What are the key points of the particle model of matter?

  1. All matter is made up of tiny particles.
  2. The particles of matter are constantly moving.
  3. The particles have empty spaces in-between them.
  4. Forces act between the particles.