Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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.
|