your name on all material to be turned in.
Answer 15 Questions. Everyon is required to do question 7. Write all answers in your “Blue Book” and show
all work in detail. Partial
credit will be given only if an answer is partially correct. You may use your calculators and your
reference material such as periodic table and formula sheets. Formula sheets (1 page, front and back) are
allowed, but NO OPEN BOOKS OR NOTES.
- Describe one difference
between an element and a compound. Name some of the physical properties of a
substance. How are physical
properties different from chemical properties?
- The metal Mercury melts
at –39°C, which is equivalent to what on the Kelvin scale? What is that on
the Farenheit scale?
- A silver ring has a
mass of 10.51 grams. When immersed
in water the ring displaces 0.953 ml.
What is the density of silver? Report the answer in significant
- You have 5.67 moles of
sulfur. How many atoms are present? How many grams do you have?
- How many protons,
neutrons, and electrons are present on a 2964Cu 2+
ion? How many protons and electrons are present on a neutral atom of
- What is the empirical
formula for a substance with the composition: Sodium(Na) 54%, Boron (B)
8.50%, Oxygen (O) 37.5%
- 2C3H8O + 9O2 ® 6CO2 + 8H2O For the given balanced equation find
the limiting reactant if you have 6 grams of C3H8O
and 15 g of O2 . How much leftover reactant ( in grams) will
- You need to prepare a
0.9 M solution of CsF salt. How many grams are required for a 2
liter solution? How many for a 150 ml solution?
- You have a 0.9 M
solution of CsF, but you need 0.05L of 0.0036M
CsF for your experiment. How do you prepare what you need?
- Pb(NO3)2 + KI ® PbI2 + KNO3 Balance the equation. Which are the precipitate and which are
spectator ions? Write out the correct net ionic equation for the
- Show the Lewis dot
structure for each of the following elements: Nitrogen, Carbon, Cesium, Bromine,
- Show the Lewis
structure of Water, Ammonia, Carbon Dioxide, and C2H2
. Indicate lone pairs as appropriate.
- Lindane, an insecticide
has a formula weight of 290.85. It
has the following percent composition.
24.78% Carbon, 2.08% Hydrogen, 73.18% Chlorine. Find the empirical and molecular
- An ice cube (1500
grams) is removed from the freezer at a temperature of 269 Kelvin, and allowed to
melt. Room temperature is 313
Kelvin. What quantity of heat was
extracted from the room?
- What quantity of heat
is required to convert 1500 grams of water at 100 oC to steam?
- The wavelength of a
photon is 600 nanometers. What is
its frequency? What is the energy
of the photon?
- Show the electron
configuration of an element with an atomic number 15. Show the electron
configuration of an element with atomic number 37.
- Write out a symbol for
an ion which has 56 protons, 81 neutrons, 54 electrons. Is it a cation or an anion?
- Balance the following
- H2 + O2
- Mg + O2 ® MgO
- Fe + O2 ® Fe2O3
+ O2 ® CO2 + H2O
+ O2 ® CO2 + H2O
Dr. Falcone Page 1 9/27/2004