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praxis 5442 Middle School Science Exam Revision Questions with Correct Solutions
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praxis 5442 Middle School ScienceExam Revision Questions with
Correct Solutions
Atomic theory was first suggested by - ANSWER the Greek named Democritus
Who expanded the atomic theory - ANSWER John Dalton in the 1780's
What did John Dalton discover? - ANSWER matter is made of atoms, atomes of an
element are similar to each other, atoms of different elements are different form
each other.
Who created the cathode ray tube? - ANSWER William Crookes
Who discovered the electron> - ANSWER JJ Thomson
JJ Thompson's model was called the ________________ - ANSWER The Plum
Pudding model
When was radioactivity discovered? - ANSWER 1896
What did Earnest Rutherford discover? - ANSWER Protons (empty space
nuclear), nucleus
, What did Niels Bohr do? - ANSWER created "Bohr model"
suggests that electrons travel around the nucleus of an atom in orbits or definite paths.
Additionally, the electrons can jump from a path in one level to a path in another level
(depending on their energy)
• Model looked like the solar system
Compound - ANSWER A substance made up of atoms of two or more
different elements joined by chemical bonds
Molecule - ANSWER A group of atoms bonded together
Mixture - ANSWER A combination of two or more substances that are not
chemically combined
common compounds - ANSWER Acids, Bases, Salts, Oxides
acid - ANSWER compound that forms hydrogen ions (H+) in solution
Base - ANSWER A substance that decreases the hydrogen ion concentration in a
solution.
How are salts formed? - ANSWER acid-base reactions
Neutralization - ANSWER A reaction between an acid and a base
Oxide - ANSWER A compound formed when something reacts with oxygen.
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