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Compounds & Mixtures

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  • Explain how salt forms naturally in Earth.
    Sodium from rocks + chlorine from volcanic gases → carried to oceans → evaporates → salt deposits
  • List one difference between a compound and a mixture.
    Compounds are chemically bonded with fixed ratios; mixtures are physically combined and variable
  • Do compounds have bonded atoms?
    Yes
  • Which method can separate salt from water?
    Evaporation
  • What mixture makes up ocean water?
    Water, salt, and minerals
  • Which method separates coffee grounds from liquid coffee?
    Filtration
  • Give one example of a mixture.
    Air, fruit salad, trail mix, soil, etc.
  • What holds atoms together in a compound?
    Chemical bonds
  • Why can mixtures be separated easily?
    Because the parts are not chemically bonded
  • What type of mixture looks the same all the way through?
    Homogeneous mixture
  • Can we see the parts of a homogeneous mixture?
    No, it looks the same all the way through
  • What do we call two or more atoms stuck together?
    Molecules
  • Name one ingredient in slime.
    Glue, water, baking soda, borax solution
  • What is one clue that a chemical change happened?
    A new substance forms (like bubbles, color change, or heat)
  • Why is air a mixture?
    Because it’s made of different gases mixed together
  • Why is slime not a compound?
    No new substance forms; ingredients can vary and be separated
  • What is a mixture?
    Two or more substances combined but not chemically bonded
  • Is slime a mixture or a compound?
    A mixture
  • If you change the amount of activator, what happens to slime?
    It changes texture — showing it’s a mixture, not a fixed compound
  • What are the tiny building blocks that make up everything?
    Atoms
  • Do mixtures always have the same ratio of parts?
    No, they can vary
  • What type of mixture lets you see the different parts?
    Heterogeneous mixture
  • Can mixtures be separated easily?
    Yes
  • Can we separate a compound like salt by hand?
    No, because the atoms are chemically bonded
  • How could you separate iron filings from sand?
    Use a magnet
  • What kind of change happens when slime forms — chemical or physical?
    Physical change
  • When baking a cake, is that a compound or mixture? Why?
    Compound — a new substance forms from a chemical change
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