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Chemistry unit - Yea 10

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  • Name one factor that increases the rate of reaction.
    (temperature / concentration / surface area / catalyst)
  • What does it mean to balance an equation?
    Same number of atoms on each side
  • A student mixes vinegar and baking soda and sees bubbles. What type of change is this?
    Chemical reaction (gas produced)
  • What happens to particles when heated?
    They move faster
  • Name one way to speed up a reaction
    Increase temperature / surface area / concentration
  • Which state has particles moving fastest?
    Gas
  • Name one laboratory acid
    (e.g. hydrochloric acid / sulphuric acid / nitric acid)
  • What gas is produced when an acid reacts with a metal?
    hydrogen
  • What is gas → liquid called?
    Condensation
  • Give one sign that a chemical reaction has occurred
    e.g colour change / gas produced / temperature change
  • What is a compound?
    Two or more elements chemically combined
  • In a faster reaction, do particles collide more or less often?
    more often
  • What is a pure substance?
    Only one type of particle present
  • What colour does universal indicator turn in an acid?
    red / orange / yellow
  • What is a molecule?
    Two or more atoms bonded together
  • What pH is neutral?
    7
  • Why does crushing a solid increase reaction rate?
    increases surface area
  • Which state has particles tightly packed in a fixed pattern?
    Solid
  • A solid is heated and turns into a liquid, but no new substance forms. What type of change?
    Physical change
  • What ion makes acids acidic?
    Hydrogen ions (H⁺)
  • What colour does red litmus turn in a base?
    Blue
  • Can compounds be separated physically?
    No (need a chemical reaction)
  • What are reactants?
    Starting substances
  • What is a mixture?
    Two or more substances physically mixed
  • Give an example of a mixture
    Air / saltwater
  • What is an element?
    A substance made of one type of atom
  • What is formed when an acid reacts with a base?
    salt and water
  • What elements are present in NaCl?
    sodium and chlorine
  • What are products in a chemical reaction?
    Substances formed
  • What is liquid → gas called?
    Evaporation / boiling
  • Why does higher temperature increase rate?
    Particles have more energy and collide more
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