AECM 2 Flashcards
An atom without an overall charge is called a
Neutral atom
A _ atom will have the same amount of protons and electrons
Neutral atom
(Neutral Atom) has no overall charge because
Electrons (-) same number as protons (+)
A positive atom will have more _ than _
Protons
Electrons
A negative atom will have more _ than _
Electrons
Protons
Atoms are usually classified as
Elements
Elements (atoms) also known as
Pure substances
There are hundreds of
Atoms
A _ is made up of only one type of atom or one type of molecule
Pure substance
A pure substance is made up of only one type of atom or one type of
Molecule
A pure substance can be either an _ or a _
Element
Compound
Oxygen and hydrogen are an example of
Pure substances
An example of a pure substance is
Sodium
A molecule is _ joining together chemically
Two or more atoms
A compound is a molecule that contains at least two different elements (or atoms) that are
Chemically combined in a fixed ratio
H2O is a compound because
Contains two different elements
Table salt a compound because
Contains two different elements
Two elements in table salt (2)
Sodium (Na)
Chloride (Cl)
Table salt’s chemical symbol
NaCl
A chemical substance is something that can’t be
Separated into its components by physical methods
Chemical substance example
Diamond is made of same substance as coal (carbon)
A compound is reacted chemically, meaning each of its individual parts,
No longer retain their own properties
Example of compound parts no longer retaining their own properties
When sodium and chloride become salt, they no longer have their harmful properties
Sodium (Na) is a
Highly reactive silverish metal
Chloride is a _ at room temp
Toxic yellow-green gas
Combinations of the parts of a compound are always fixed example
H2O always two hydrogen, one oxygen
