Chemical Interactions
Chapter 2 Review
Good Luck!
How do the properties of a compound
compare with the properties of the
elements that make it?
They are often quite different
What two factors determine the
properties of a compound?
the types of atoms it contains and how the atoms are arranged
How do we represent
compounds?
by a chemical formula
NaNO3 has how many oxygen
atoms?
Three
What is a subscript?
a subscript is a number written to the right of a
chemical symbol and slightly below it.
Write the formula for one atom of
nitrogen and one atom of oxygen.
NO
How can millions of compounds be
made from the atoms of about 100
elements
atoms can combine in many different ratios
What do you get when an atom
loses or gains an electron?
an ion
What do you call the force of
attraction between positive and
negative ions?
an ionic bond
What type of bond holds a crystal
together?
Ionic bond
What is the name of MgO
magnesium oxide
What type of bond is formed
when electrons are shared?
covalent
What type of bond forms from
unequal sharing of electrons?
Polar covalent
What is responsible for many of
the properties of substances?
their structure
What type of bond is found in
individual molecules?
covalent
What part of an atom is involved
in chemical bonding?
electron cloud
What property of the electrons in a
metal gives the metal its properties?
They move easily
Are covalent compounds good
conductors of electricity when
dissolved? Why or Why not?
No, molecules stay together and do not conduct an electrical
current.
How do metal atoms bond
together?
Metal atoms share electrons with many other metal atoms at
the same time.
Why do ionic compounds have
high melting points?
Each ion in a crystal is rigidly bonded to the several ions that
surround it. Because each ion is strongly bonded to other
ions, much energy has to be added to break the bonds.
What are three forms of the
element carbon?
Graphite, diamond, and fullerene
Most substances are
compounds
All compounds are made of
atoms of two or more elements
The chemical formula for a
compound have one barium (Ba)
ion and two chloride (Cl) ions is
BaCl2
The 4 in the chemical formula
CH4 means there are
four hydrogen atoms to one carbon atom
An atom becomes a positive ion
when it
loses an electron to another atom
A polar covalent bond forms when
two atoms
share two electrons unequally
Metallic bonds make many metals
good conductors of electricity