Acetylene (C2H2) torches are typically used for welding applications. How much heat in kJ evolve when 2.35 kg of acetylene are burned in excess oxygen gas? The reaction is given by: Must show your work (scratch paper) to receive credit. 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(l)       ΔH°rxn = – 2599.0 kJ

For a particular process that is carried out at constant pressure, q = 200 kJ and w = -85 kJ. Therefore,

Use the standard enthalpies of formation provided to calculate the change in enthalpy for the reaction below: C3H8(g)  +  H2(g) → C2H6(g)   + CH4(g)    ΔH°f (kJ/mol) C3H8(g)  -103.85 C2H6(g)  – 84.68 CH4(g)  – 74.6 Must show your work (scratch paper) to receive credit.

Write the condensed (short form) electron configuration for Cl:( Make sure to follow the order following the Aufbau principle. Do not consider exceptions. Do not use superscripts, do not write the brackets on the noble gas. Use the following format Ne – 3s2 ….)

Which ion has the largest radius?                   Ca+2, Ca+1, Br-, K+ 

A gold nugget (mass = 376 g) is originally at 398 K is placed in cold water. Its temperature drops to 297 K. If the specific heat capacity of gold is 0.128 J/g°C, how much heat was lost by the gold nugget? Must show your work (scratch paper) to receive credit.

Phosphorylation of which protein(s)’s C-terminal domain tail serves as the timer and spatial organizer of eukaryotic transcription?

You are studying a yeast mutant where the CTD tail of RNA Pol II has several key serines (phosphorylatable amino acids) converted to alanines (non-phosphorylatable). The result of these changes is the failure of polyA polymerase (PAP) to bind during transcription. The resulting RNA polymerase protein would most likely  be capable of synthesizing:

You have identified a new Sigma factor that can bind directly (with varying affinities) to DNA regions that have the sequences shown below. Based on these results, what is the strongest promoter sequence?  

If you perform a genetic experiment in E. coli such that you replace the bacterial RNAP with yeast RNA Pol II, which of the following would you most likely find?