Chemistry Semester Exam Review 2012
A student must determine the identity of an unknown piece of metal. Known densities are given below.
The student finds the mass of the metal was 35.00 grams. The piece is determined to be 1.05 inches
long, 0.021 meters wide, and 0.55 cm tall. Show all work. What is the identity of this metal?
Iron – 7.87 g/cm3
Copper – 8.96 g/cm3 Lead – 11.36 g/cm3
Zinc – 7.13 g/cm3
Complete the following symbols and names:
Sr
Sr2+
OH-
iron (III) ion
chloride
Write a nuclear symbol for an element that contains 48 protons and 62 neutrons. Write an equation
showing it decay by releasing an alpha particle.
Consider the following: MnBr3
Name each ion
Name the salt
Write the electron configuration for the anion/cation
Write the symbol of the metal
How many protons does this metal have?
Does either of the ions have color? How do you know?
Identify each of the following elements by writing the symbol. Limit your answers to those elements
with atomic numbers 1-56
The inert gas found in the 3rd period
The alkaline metal with the smallest atomic radius
The element which exists as a diatomic molecule and forms -3 ions
The element which is misplaced on the periodic table due to general properties
A metalloid in group 4A
The first element to demonstrate electron configuration exceptions in the “d” block
The element with the highest ionization energy
Label each of the following as a(n) element, compound, or mixture
Lithium hydroxide
a box of cake mix
gold
Write a set of quantum numbers for the 17th electron in lead
Draw a lewis structure for SO3
Does it have unshared pairs? Name a terminal atom
Does it have any multiple bonds?
Crude oil spreads on water to form a layer that is 100 nm thick. How many square meters of ocean
would be covered by a slick caused by two barrels of oil being spilled?
1 nm = 10-9 m 1 barrel = 31.5 gallons 1 qt = 57.75 in3 1 in = 2.54 cm
Consider 12.0 grams of a mixture containing the following items (along with some properties).
A – solid (melting point 235oC, density 2.22 g/cm3 )
B- solid (melting point 135oC, density 1.55 g/cm3)
C- solid (melting point 100oC, density 0.65 g/cm3)
D- liquid (none of the solids are water soluble, boiling pt – 100oC)
Describe how you could separate this mixture using common laboratory/household items
Iridium (Ir with an atomic weight of 192.217) consists of two isotopes occurring naturally. One of these
isotopes is Ir-191 and accounts for 37% of the Ir found on earth. What is the percentage and mass
number of the other isotope?
For each of the following, label it as a physical or chemical change:
Crushing a rock with a hammer
Melting Ice
A rotting “road kill”
How many significant figures in the following numbers?
1.005 x 107
0.00104
20500
Draw a Lewis structure for the following: ClO3Name a terminal atom. Are there any unshared electron pairs?
Consider the following molecule:
What is it’s molecular formula? What type of bonds are present? How many of each bond type?
Name the following compound: CCl4