CHEM 112 Final Exam Study Guide Crossword

*A new substance is formed as a result of a
Any sample of a compound is
The elements in a(n) __________ are always in the same ratio
Factors that can change during an experiment are called
Two solid substances that have been stirred together but not chemically combined
Air, water, and rock are examples of
*Samples of a specific compound from different sources obey the law of
Chemical reactions change the _____ of atoms
*Methane (CH4) and ethane (C2H6) illustrate the law of
A cathode ray tube emits only
Rutherford used _____ foil to study atomic structure
A neutron has a charge of
*The number of protons represents the
The number of electrons in an element equals the number of
Two isotopes of an element differ in the number of
A prediction is scientific hypothesis only if it is
How many magnesium atoms are in the formula for magnesium nitride
The atomic radius ________ from top to bottom on the periodic table
*Mendeleev organized his periodic table based on
A _____ in the periodic table is a vertical colmn of elements
The Law of Octaves stated that every ______ element had similar properties
Two Isotopes of an element differ in the number of
*The vertical columns of the periodic table represent elements with similar
Group 17 elements are called
The highest electronegativtiy value is shown by
An atom of a metal becomes an ion by the _____ of one or more electrons
The type of bond formed when two atoms share a pair of electrons is called
When the atom gains an electron, the resulting particle is an
The shape of a water (H20) molecule is
The major part of the average exposure of humans to radition comes from _______ sources
Atoms that have the same atomic number but different numbers of neutrons are
In the famous relationship: E=mc^2, the symbol m represents
In the fission of uranium-235, which particle causes and propagates the chain reaction
Beta particles are
In order to change one element into another, a change must take place in the
What type of reaction makes a "hydrogen" bomb so destructive
The best shielding material agaisnt beta radition is
The particle which has the smallest mass is the
An alpha particle is a _______ nucleus
________ rays have zero mass and zero charge
The radioactivity of _______ atoms in non-living materials diminishes slowly