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S1 Particles of Matter

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  • Describe the arrangement of atoms in a solid.
    All atoms are close together in a fixed shape
  • What does this symbol mean?
    Irritant
  • Name the state change from gas to liquid
    Condensation
  • What does this symbol mean?
    Corrosive
  • Describe the arrangement of atoms in a liquid.
    Atoms are close together with no fixed shape and can flow over one another.
  • Name the state change from liquid to gas
    Evaporation / boiling
  • True or false: gases do not have a fixed shape.
    True!
  • I have a melting point of 600oC and a boiling point of 1200oC. Am I a solid, liquid or gas at room temperature?
    Solid
  • Everything is made up of what small type of particle?
    Atoms
  • What does this symbol mean?
    Toxic
  • Describe what diffusion is.
    When particles moves from a high concentration to a low concentration.
  • Name the state change from solid to liquid
    Melting
  • What is condensation?
    When a gas changes into a liquid.
  • Name the purple particles which sublime when heated
    Iodine
  • Name the 3 states of matter.
    Solids, liquids and gases
  • Which of these liquids evaporate faster: water or ethanol?
    Ethanol
  • Describe what an dependent variable is.
    Something we measure in an experiment.
  • True or false: the melting point of water is 100 degrees C.
    False
  • If I mix 50mL of peas and 50mL of sand, will I have more than, less than, or exactly 100mL in total?
    Less than 100mL - the sand can fit into the gaps between the peas!
  • Name the state change from solid to gas
    Sublimation
  • Why can I not use a Bunsen burner to boil ethanol?
    Because it is a flammable liquid.
  • Describe what happens when something freezes.
    It turns from a liquid into a gas / the particles come closer together and make a fixed shape.
  • I have a melting point of -200oC and a boiling point of -95oC. Am I a solid, liquid or gas at room temperature?
    Gas
  • What does sublimation mean?
    When a solid directly changes into a gas?
  • I have a melting point of -37oC and a boiling point of 250oC. Am I a solid, liquid or gas at room temperature?
    Liquid
  • If I mix 50mL of water and 50mL of ethanol, will I have more than, less than, or exactly 100mL in total?
    Less than - some ethanol will evaporate and we will be left with less.
  • What does this symbol mean?
    Flammable
  • What is the melting point of a substance?
    The temperature at which a solid changes to a liquid.
  • State one thing that gases can do that solids and liquids cannot.
    They can be compressed.
  • Describe what a control variable is.
    Something we keep the same / constant throughout an experiment.
  • Describe the arrangement of atoms in a gas.
    Atoms have a lot of space between them and are far apart.
  • When atoms join together, what do they form?
    Molecules (or compounds)
  • True or false: salt melts in water
    False! It dissolves.
  • What is the boiling point of a substance?
    The temperature at which a liquid changes to a gas.
  • What is evaporation?
    When the surface of a liquid changes into a gas.
  • Describe what an independent variable is.
    Something we change in an experiment.