CHEM 120 UNIT 2
The correct charge on the barium ion (#56) is
+2
How many nonbonding pairs are present in ammonia, NH3?
1
How many covalent bonds does the element O (#8) usually form?
2
How many dots are in the dot diagram for Oxygen (#8)?
6
The correct formula for a compound between Al and P is:
AlP
The correct formula for a compound between Ba and O is:
BaO
Which of the following elements would have properties similar to F (#9)?
Br (#35)
Sulfate is a polyatomic ion, SO4-2. What is the formula for calcium sulfate? (Calcium is #20)
CaSO4
TRANSITION metals named one way(using roman numerals)
Cr2+ = chromium (II) ion Cr3+= chromium (III) ion
Which of the following elements would be classified as a nonmetal?
F (#9)
The correct formula for iron (III) sulfide is
Fe2S3
Which of the following elements would be classified as an alkali metal?
K (#19)
What is the correct formula for potassium phosphide?
K3P
The correct formula for a compound between Mg and O is:
MgO
The element in group I and period 3 is:
Na (#11)
The correct formula for a compound between Na and N is:
Na3N
Which of the following is most likely to happen to an oxygen atom, O (#8), in order for it to acquire an octet of valence electrons?
O will gain two electrons to form O-2
Which of the following elements will form a cation?
Potassium (#19)
The correct name of Al-3 is (Al is #13)
aluminum ion
State the octet rule.
atoms will gain, lose, or share electrons in order to achieve 8
Which of the following elements would be classified as a representative element?
both K (#19) and Ar (#18) are representative elements
element
cannot be broken down Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions. Elements can only be changed into other elements using nuclear methods.
polyatomic ions
charged particles containing 2 or more covalently bonded atoms
An unknown substance Z can be broken down to substances X and Y by running an electric current through it. Substance Z is
compound
The correct name of Cu+2 is (Cu is #29)
copper (II) ion
In a nonpolar covalent bond,
covalent electrons are shared equally between two nonmetal atoms
heterogeneous mixture
different composition throughout ex: chunky peanut butter, chicken noodle soup
The octet rule states that
elements with 8 valence electrons are stable
Any halogen would be most likely to
gain one electron to form a -1 ion
Describe the organization of the periodic table.
groups are vertical, periods are horizontal, measured by metals, transition metals, nonmetals, and metalloids
Chlorine (#17) is a(n)
halogen
Fluorine is a nonmetal with a very high electronegativity. Sodium is a metal with very low electronegativity. A bond between sodium and fluorine would be classified as:
ionic
When a metal loses electrons and bonds to a nonmetal which gains electrons, the resulting compound is considered:
ionic
naming ionic compounds
listing cation name first followed by anion name BaS= barium sulfide AlF3= aluminum flouride K2S= potassium sulfide
To fulfill the octet rule, an atom of magnesium (#12) will
lose two electrons
The correct name for MgO is
magnesium oxide
ionic compound
metal to nonmetal
A substance is made of small brown particles and small white particles. When poured into water, the substance separates - the brown particles sink and the white particles float. The original substance would be considered a(n)
mixture
anions are
negative ions, they are named by replacing the ending of the element with -ide followed by the word ion Br-1=bromide ion O2-=oxide ion S2- = sulfide ion
The correct name of N-3 is (N is #7)
nitride ion
How many covalent bonds does the element Ar (#18) usually form?
none
Which of the following elements has the symbol P?
phosphorus
Which of the following is an example of a homogeneous mixture?
salt water
homogeneous mixture
same composition throughout ex: creamy peanut butter
covalent bonds
sharing of electrons to give each atom an octet, nonmetal to nonmetal, DO NOT SIMPLIFY
Mendeleev arranged his elements in the periodic table by
similar chemistry in the same column
atom
smallest component of an element
How are electrons transferred between sodium and fluorine atoms to form sodium fluoride?
sodium loses one electron and fluorine gains the one electron
The correct name for SrCl2 is
strontium chloride
compound
two or more elements chemically combined. Ex: H20, sugar, exhaled air
mixture
variable, retains identity, but mixes