Reading...
Play button
Play button
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;
21 Cards in this Set
- Front
- Back
|
Mixture
|
A sample of matter composed of two or more substances, each of which retains its identity and properties.
|
|
|
Element
|
A pure substance that cannot be decomposed into a simpler substance by chemical means.
|
|
|
Compound
|
A pure substance made up of two or more different elements in a fixed, characteristic chemical combination.
|
|
|
Atom
|
The smallest unit of an element that can exist as a stable independent entity
|
|
|
Molecule
|
The smallest particle of an element or compound capable of a stable, independent existence.
|
|
|
Proton
|
A subatomic positively charged particle
|
|
|
neutron
|
a subatomic particle with a neutral charge and about the same mass as a proton
|
|
|
electron
|
a subatomic particle with a negative charge and a mass of almost 0.
|
|
|
catalyst
|
chemical substance that accelerates the rate of a reaction without being changed
|
|
|
atomic number
|
the # of protons in the nucleus of an atom
|
|
|
mass number
|
the sum of the # of protons and neutrons in the nucleus of an atom
|
|
|
isotopes
|
two or more forms of the same element whose nuclei differ in number of neutrons (and mass)
|
|
|
covalent
|
a type of bond where electrons are shared between atoms
|
|
|
photon
|
A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass
|
|
|
steady state
|
a condition in which a dynamic system is in balance so that there is no net change in concentration of the major species involved
|
|
|
nucleus
|
the center of an atom, made up of protons and neutrons
|
|
|
matter
|
Matter is anything that has mass and takes up space
|
|
|
allotropes
|
Each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon
|
|
|
wavelength
|
the distance between successive peaks in a sinusoidal wave
|
|
|
frequency
|
the number of waves passing a fixed point in 1 second
|
|
|
free radical
|
a highly reactive chemical species with one or more unpaired electrons
|
