Share 8th Grade Science 1st Exam Unit 5
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What sub-atomic particle has a positive charge?
Proton
Which sub-atomic particle has the smallest mass?
Electron
What two sub-atomic particles make up the nucleus of an atom?
Protons and Neutrons
What gas was most abundant in the early atmosphere?
Carbon Dioxide
What holds atoms together?
Chemical Bonds
Who discovered the electron?
J. J. Thompson
What model of the atom did J. J. Thompson propose?
Plum Pudding Model
Who proved the existence of neutrons?
James Chadwick
What did Rutherford's gold foil experiment demonstrate?
Atoms contain a dense nucleus
What does "peer review" mean in science?
Reviewing scientific work
What percentage of 9-carat gold is pure gold?
37.5%
What percentage of silver is in silver marked 900?
90%
What element mixed with carbon makes blue diamonds?
Boron
What is the study of weather called?
Meteorology
Which climate zone is the coldest and driest all year?
Polar
What is the coldest part of an Ice Age called?
Glacial Period
