1. An acetylene torch undergoes the following reaction:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Student “X” identified oxygen as the reducing agent. Please provide a detailed
explanation (in your own words) to describe whether or not the student correctly
identified the reducing agent.
2. When determining the theoretical yield for a reaction, why must we first determine which
reactant is the limiting reactant? In addition, please use your own values to provide an
example of how to determine a limiting reagent. Use the following reaction:
3 NH4NO3 (aq) + Na3PO4 (aq) (NH4)3PO4 (aq) + 3 NaNO3 (aq)
3. Two different solutions of NaNO3 both contain 0.5 moles of NaNO3, but they have
different molarities. Please provide a detailed explanation (in your own words) how this
4. Student “X” solved the following problem incorrectly. Please provide a detailed
explanation (in your own words) the error, or errors (there can be more than one) made
by student “X”.
Consider the following equation:
Ba(OH)2(s) + 2 HCl(aq) BaCl2(s) + 2 H2O(l)
How many liters of 0.100 M HCl would be required to react
completely with 2.50 grams of barium hydroxide?
Student “X”’s response:
? L HCl = 2.50 g Ca(OH)2 x (1 mol Ca(OH)2) x ( 1 L )
(154.336 g) (0.100 mol HCl)
= 0.16198424 L of HCl
5. What will happen to the internal pressure of a gas in a rigid container if the temperature
of the gas is increased? Will the pressure increase, decrease, or stay the same? Please
provide a detailed explanation (in your own words) using both molecular (qualitative) and
mathematical (quantitative) concepts.
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