Equilibrium and Kinetics Bell Ringers Part 3 – Show all Work
Name:_________________
3/21/11 –Review Equilibrium Constants and LeChalelier’s Principle Formative HW: Equilibrium
When nitrogen and hydrogen react, they form ammonia gas, which has the formula NH3. If 56.0 g of
nitrogen are used up in the reaction, how many grams of ammonia will be produced? Write the
equation, balance the equation, convert grams to moles, moles to moles, and then moles to grams.
3/22/11 – GA Lab
Which of the following is a characteristic common to the alkaline earth metals?
A. They easily gain an electron to form ions with a 1- charge.
B. They easily gain two electrons to form ions with a 2 - charge.
C. They easily lose two valence electrons to form ions with a 2+charge.
D. They easily lose one valence electron to form ions with a 1+ charge.
Although aluminum is the most abundant metal in Earth’s crust, why is it better to recycle aluminum than to
mine more of it?
A. Most aluminum ore is located beneath the oceans.
B. Aluminum ore is dangerous to handle.
C. It takes more energy to separate aluminum from its ore than to recycle aluminum.
D. Mining aluminum ore causes a lot of air pollution.
3/23/11 – Nuclear Chemistry Review
What is the half-life of a radioisotope if 50.0 grams of an original 200 gram sample of the isotope remains
unchanged after 85 years.
A piece of metal is heated in a Bunsen burner flame and then immersed in
a beaker of cool water. Which statement best describes the effect of
the temperature changes on the kinetic energy of the particles?
A Kinetic energy of metal atoms decreases in the flame.
B Kinetic energy of water molecules increases when the heated metal is
immersed.
C Kinetic energy of water molecules decreases when the heated metal is immersed.
D Kinetic energy of metal atoms increases when immersed in the cooler water.
3/17/11 – Empirical Formulas
This is a heating curve for a substance.
Between points X and Y, which would be observed?
A Solid and liquid will be present.
B Only vapor will be present.
C Liquid and vapor will be present.
D Only liquid will be present.
Identify on the graph all phase changes when you could
use the specific heat equation w/o phase change.
An open container of water is brought to a boil and heated
until all of the water is converted to water vapor.
Which describes the changes in the water molecules?
A The molecules speed up and move farther apart.
B The molecules speed up and move closer together.
C The molecules slow down and move farther apart.
D The molecules slow down and move closer together.
Hydrogen peroxide must be stored in a dark bottle because light causes it to break down into water and oxygen.
This change is what type of reaction?
A. combustion
B. synthesis
C. decomposition
D. single-replacement
What is the mass in grams of one mole of any pure substance called?
A. atomic mass
B. average mass
C. molar mass
D. molecular mass
3/18/11 – Review and Practice HW: Online link on www.marric.us/HS_Chem_Equilibrium_Online_Quiz1
The tarnishing of chrome plated bumpers of antique cars is represented by the following balanced chemical
equation. 4Cr(s) +3O2(g)  2Cr2O3(s) What is the mole ratios you would use to predict correctly the number
of moles of chromium needed to produce six moles of chromium (III) oxide
A burning candle produces water and carbon dioxide. What is the limiting reactant as the combustion of wax in a
candle burns in an open room?
A. carbon dioxide
B. oxygen
C. water
D. wax
3/19/11 – Quiz
Fe2O3 + 3CO

2Fe + 3CO2
In this reaction, how many grams of Fe2O3 are required to completely react with 84 grams of CO?