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37 Cards in this Set

  • Front
  • Back
Matter is defined as?
anything that occupies space and has weight
a substance which cannot be reduced to a simpler substance by chemical means is called?
an element
When two or more elements are chemically combined, the resulting substance is called a?
Compound
What do you call a combination of elements and compounds, not chemically combined, that can be separated by physical means?
A mixture
A ______ is a chemical combination of two or more atoms
MOLECULE
An _____ is the smallest particle of an element that retains the characteristics of that element.
atom
The atomic number of an atom is determined by the number of _____ in its nucleus.
protons
What are the three types of subatomic particles, and what are their charges?
Proton - positve
Electron - negative
Nuetron - no charge
What determines the valence of an atom?
The number of electrons in the outermost shell
What does the valence of an atom determine?
its ability to gain or lose an electron
When the atom loses electrons or gains electrons in the process of electron exchange, it is said to be _____.
Ionized
For ionization to take place, there must be a transfer of energy which results in?
change in the internal energy of the atom
ionization is the process by which an atom loses or gains ______.
electrons
all elements of which matter is made may be placed into one of three categories:
conductors, semi-conductors, insulators
______ are elements which conduct electricity very readily
conductors
_______ have an extremely high resistance to the flow of electricity
insulators
What theory states that all matter is composed of atoms and the atoms are composed of smaller particles called protons, electrons, and neutrons?
The Electron Theory
Which electrons are the easiest to break loose from their parent atom?
Valence Electrons
What is one of the easiest ways to create a static charge?
Friction
A static charge is more easily created between ______.
nonconducting materials
When two bodies of matter have unequal charges and are near one another, an electric force is exerted between them because of their unequal charges. However, since they are not in contact, their charges cannot equalize. The existence of such an electric force, where current cannot flow, is referred to as _______?
Static Electricity
Since ions are actually atoms without their normal number of electrons, it is the ___________________ in a substance that determines its charge
excess or the lack of electrons
Which law states that charged bodies attract or repel each other with a force that is directly porportional to the product if thier individual charges, and is inversely porportional to the square of the distance between them
Coulomb's Law
The space between and around charged bodies in which their influence is felt is called an ______.
Electric field of force
Magnetism is generally defined as?
that property of a material which enables it to attract pieces of iron
What are magnetic materials?
They are materials that are attracted by a magnet and have the ability to become magnetized.
An alloy is made from combining two or more elements, one of which must be a _____.
Metal
The most important group of materials connected with electricity and electronics are the __________.
ferromagnetic materials
Ferromagnetic materials are those which are?
relatively easy to magnetize, (such as iron, steel, cobalt, and the alloys Alnico and Permalloy)
Magnets produced from magnetic materials are called?
Artificial Magnets
Artificial magnets are usually classified as ______ or _______, depending on their ability to retain their magnetic properties after the magnetizing force has been removed.
Artificial magnets are usually classified as PERMANENT or TEMPORARY, depending on their ability to retain their magnetic properties after the magnetizing force has been removed.
Magnets made from substances, such as hardened steel and certain alloys which retain a great deal of their magnetism, are called ______.
Permanent Magnets
The opposition that a material offers to the magnetic lines of force is called _________.
reluctance
The amount of magnetism which remains in a temporary magnet is referred to as its _________.
risidual magnetism
If a bar magnet is suspended freely on a string, it will align itself in a _____ and _____direction.
If a bar magnet is suspended freely on a string, it will align itself in a NORTH and SOUTH direction.
The north pole of a magnet will always be _______ to the south pole of another magnet and will show a _______ to a north pole.
The north pole of a magnet will always be ATTRACTED to the south pole of another magnet and will show a REPULSION to a north pole.
The law for magnetic poles is:
Like poles repel, unlike poles attract.