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Y8 Chemical Reactions

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  • What does the atomic (bottom) number tell us?
    Number of protons/electrons
  • Is a handwarmer endothermic or exothermic?
    Exothermic
  • What is the test for carbon dioxide gas?
    Bubble through limewater - turns cloudy
  • How many electrons can go in the first shell?
    2
  • What is conservation of mass?
    Mass of reactants = mass of products
  • What is the charge of a proton?
    Positive +1
  • How many electrons can go in the second shell?
    8
  • What is an atom?
    The smallest particle which makes up everything
  • How do we know if a chemical reaction has taken place?
    Colour change, light given off, temperature change, bubbles, gas produced
  • What is an exothermic reaction?
    Energy exits
  • What is an endothermic reaction?
    Energy enters
  • What is the charge of a neutron?
    Neutral 0
  • What does the period number tell us?
    Number of shells
  • What is an element?
    Made from only 1 type of atom
  • Is a self-heating can endothermic or exothermic?
    exothermic
  • What does the group number tell us?
    Number of electrons in the outer shell
  • What is the test for hydrogen gas?
    Lit splint- squeaky pop
  • What is a compound?
    Two or more elements chemically combined
  • Why is carbon monoxide dangerous?
    Toxic gas which is odourless/colourless
  • What is the test for chlorine gas?
    Damp litmus paper - bleaches
  • What is the test for oxygen gas?
    Glowing splint - relights
  • What does the mass (top) number tell us?
    Protons + Neutrons
  • Is a sports injury pack endothermic or exothermic?
    Endothermic
  • What is combustion?
    Burning
  • If there is not enough oxygen for complete combustion, what gas is formed instead?
    Carbon monoxide
  • What is the charge of an electron?
    Negative -1
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