A 1.50 g sample of sodium nitrate is decomposed by heating. If the resulting sodium nitrate has a mass of 1.19 g and the theoretical yield is 1.22 g, find the percent yield.
What is 97.5 percent?
200
How much heat (in kJ) is absorbed when 24.8 g H2O liquid is converted to steam at 100 degrees Celsius?
*Hint: Heat vaporization for H2O is 40.7 kJ/mol*
What is 56.1 kJ/mol?
200
How many milliliters of 6.0 M KOH is required to produce, by dilution, 30.0 mL of 5.0 M solution?
What is 25 mL?
200
When a system at equilibrium is subjected to a stress, the system will shift its equilibrium point in order to relieve the stress.
What is Le Chatlier's Principle?
200
Calculate the pH:
[H+]= 3.64 x 10^-9
What is 8.44?
300
Name the reaction type:
AgNO3 + KCl → KNO3 + AgCl
What is a double replacement reaction?
300
Three ENDOTHERMIC phase change processes.
What are melting, sublimation, and vaporization?
300
The solute in the mixture: 10.0 g of glucose and 500.0 mL of water.
What is glucose?
300
Write the equilibrium constant expression:
In a synthesis reaction, hydrogen gas and gaseous bromine react to produce gaseous hydrogen bromide.
What is [HBr]^2/[H2][Br2]?
300
Write the conjugate acid for the base:
HCO3
What is H2CO3?
400
Quantities that are conserved in a chemical reaction include which of the following: moles, mass, atoms, volume, molecules.
What are atoms and mass?
400
In this law, PRESSURE is constant and VOLUME and TIME are directly proportionate. *Hint: May help to sketch graph*
What is Charles' Law?
400
(mass of solute/mass of solution) x 100%
What is mass percent?
400
Increased kinetic energy results in more frequent collisions and collisions with greater energy.
What is increased temperature?
400
Write the balanced chemical equation for neutralization reactions between the following acids and bases:
Acid: HCl
Base: NaOH
What is HCl + NaOH -> NaCl + H2O?
500
Using the empirical formula, calculate the moles (subscript) of carbon in caffeine with a percent composition of 49.5% carbon. *Hint: Oxygen is the limiting reactant at 1.03 mole*
What is 4?
500
A 3.25 L container of ammonia gas exerts a pressure of 652 mm Hg at a temperature of 243 K. Calculate the pressure of this same amount of gas in a 2.50 L container at a temperature of 221 K. *Hint: Use Combined Gas Law*
What is 771 mm Hg?
500
Calculate the molarity of 12.5 g KCL in 85.0 mL of solution.
What is 1.98M?
500
At 350 degrees C, the equilibrium concentrations for the reaction:
N2 (g) + 3 H2 (g) <--> 2 NH3 (g)
[N2]=0.885M [H2]=0.665M [NH3]=1.230M
Calculate for K.
What is 5.81?
500
Identify the conjugate pairs in the acid base reaction. Indicate which compounds are acids and bases as well.
HSO4^1- + H2O <--> SO4^2- + H3O^1+
What is Acid: HSO4^1-, Conjugate base: SO4^2-,
Base: H2O, Conjugate acid: H3O^1+?