Placement Test: Chemistry, Chemistry Placement Test Guide, chemistry placement test, Chemistry Placement, Chemistry Placement, Chemistry Placement Questions and Correct Answers the Latest Update
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Course
Chemistry Placement
Institution
Chemistry Placement
Matter
Anything that has mass and takes up space; made of atoms
Atoms
Basic unit of matter which cannot be broken down and contain mostly empty space;
contains three parts: the electron, proton, and neutron
Elements
A pure substance that contains only one type of atom
Compound
Two or m...
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✓ Used and combined previous ideas to discuss the atom; elements are made of atoms; all
atoms of an element are identical; atoms of different elements are different; law of
constant composition; atoms are invisible
Law of Constant Composition
✓ Atoms of one element can combine with other elements to form compounds; a given
compound always has the same relative numbers and types of atoms
J.J. Thomson
✓ Discovered electrons and protons and developed the plum pudding model of an atom
Electrons
✓ The negatively charged particle in an atom; circles around the nucleus in the electron
cloud
Proton
✓ The positively charged particle in an atom; located in the nucleus; determine the element
Neutron
✓ The neutral particle in an atom; it has no charge and is located in the nucleus
Plum Pudding Model
✓ A model of the atom that depicts a sphere of positive charge with electrons scattered
throughout
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Ernest Rutherford
✓ Conducted an experiment in which he shot alpha particles at gold foil; roved there was a
small, dense nucleus with a positive charge and that protons are positive
Metals
✓ Elements located on the left side of the periodic table that want to lose electrons
Characteristics of Metals
✓ - Malleable
✓ - Ductile
✓ - Conductive
✓ - Lustrous
Malleable
✓ The ability to be molded into shapes
Ductile
✓ The ability to be pulled into wire
Conductive
✓ The ability to allow heat or electricity to pass through an object
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