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8th Grade Science 1st Exam Unit 5
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What is the smallest unit of an element?
Atom
What element do humans breathe in to survive?
Oxygen (Oâ‚‚)
What type of charge does a neutron have?
No charge (Neutral)
What gas do plants take in for photosynthesis?
Carbon Dioxide (COâ‚‚)
What is the chemical formula for water?
Hâ‚‚O
True or False: Climate is the average weather in an area over several years.
True
True or False: Interglacial periods are warmer than glacial periods.
True
True or False: Climate can change in minutes.
False
True or False: Diamonds can have different colors if impurities are present.
True
True or False: Seawater is made of pure water with no salts.
False
What are large rocks called?
Boulders
What does the greenhouse effect refer to?
Carbon dioxide and other gases trapping heat on Earth
What process changed the atmosphere from mostly carbon dioxide to having oxygen?
Photosynthesis
Which of these is NOT evidence for Ice Ages: Fossils, Glaciers, Peat Bogs, or Volcanic Activity?
Volcanic Activity
What is the coldest part of an Ice Age called?
Glacial Period
Which climate zone is the coldest and driest all year?
Polar
What is the study of weather called?
Meteorology
What element mixed with carbon makes blue diamonds?
Boron
What percentage of silver is in silver marked 900?
90%
What percentage of 9-carat gold is pure gold?
37.5%
What does "peer review" mean in science?
Reviewing scientific work
What did Rutherford's gold foil experiment demonstrate?
Atoms contain a dense nucleus
Who proved the existence of neutrons?
James Chadwick
What model of the atom did J. J. Thompson propose?
Plum Pudding Model
Who discovered the electron?
J. J. Thompson
What holds atoms together?
Chemical Bonds
What gas was most abundant in the early atmosphere?
Carbon Dioxide
What two sub-atomic particles make up the nucleus of an atom?
Protons and Neutrons
Which sub-atomic particle has the smallest mass?
Electron
What sub-atomic particle has a positive charge?
Proton
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