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8th Grade Science 1st Exam Unit 5

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  • What process changed the atmosphere from mostly carbon dioxide to having oxygen?
    Photosynthesis
  • What type of charge does a neutron have?
    No charge (Neutral)
  • True or False: Climate can change in minutes.
    False
  • Who discovered the electron?
    J. J. Thompson
  • What sub-atomic particle has a positive charge?
    Proton
  • True or False: Climate is the average weather in an area over several years.
    True
  • What gas do plants take in for photosynthesis?
    Carbon Dioxide (CO₂)
  • True or False: Interglacial periods are warmer than glacial periods.
    True
  • What two sub-atomic particles make up the nucleus of an atom?
    Protons and Neutrons
  • What holds atoms together?
    Chemical Bonds
  • Which of these is NOT evidence for Ice Ages: Fossils, Glaciers, Peat Bogs, or Volcanic Activity?
    Volcanic Activity
  • What element mixed with carbon makes blue diamonds?
    Boron
  • True or False: Seawater is made of pure water with no salts.
    False
  • What percentage of silver is in silver marked 900?
    90%
  • Who proved the existence of neutrons?
    James Chadwick
  • What is the smallest unit of an element?
    Atom
  • What model of the atom did J. J. Thompson propose?
    Plum Pudding Model
  • What is the coldest part of an Ice Age called?
    Glacial Period
  • What is the study of weather called?
    Meteorology
  • What percentage of 9-carat gold is pure gold?
    37.5%
  • What did Rutherford's gold foil experiment demonstrate?
    Atoms contain a dense nucleus
  • True or False: Diamonds can have different colors if impurities are present.
    True
  • What element do humans breathe in to survive?
    Oxygen (O₂)
  • What gas was most abundant in the early atmosphere?
    Carbon Dioxide
  • What are large rocks called?
    Boulders
  • Which climate zone is the coldest and driest all year?
    Polar
  • What is the chemical formula for water?
    H₂O
  • What does "peer review" mean in science?
    Reviewing scientific work
  • Which sub-atomic particle has the smallest mass?
    Electron
  • What does the greenhouse effect refer to?
    Carbon dioxide and other gases trapping heat on Earth
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