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1. Consider a 75.0 gram sample of H2O(g) at 125 degrees Celsius. What phase or phases are present when 215 KJ of energy is removed from this sample?
2. A 0.250 gram chunk of sodium metal is cautiously dropped into a mixture of 50.0 grams of water and 50.0 grams of ice, both at 0 degrees Celsius. The reaction is 2Na(s)+2H2O(l) yields 2NaOH(aq)+H2(g) enthalpy=-368 KJ.Will the ice melt? Assuming the final mixture has a specific heat capacity of 4.18 J/g*degrees celsius, calculate the final temperature. The enthalpy of fusion for ice is 6.02 KJ/mol.
what mass of Na2CO3 will be required to titrate 75.0 mL of 0.350 M HCl. This is the balanced equation given Na2CO3+2HCl--->2NaCl +H2O+CO2
In glycogen degradation, what enzyme is responsible for releasing a glucose molecule attached to the main glucose chain at a branch point
Identify the statements that accurately describe how hydrogen ion concentration relates to energy production in oxidative phosphorylation. ATP synthase provides energy in the form of ATP to actively transport H+ into the mitochondrial matrix.
Determine delta H of this reaction (kJ/mol H 2 SO 4 ) - When 24.4 mL of 0.500M sulphuric acid ,H 2 SO 4 is combined to 24.4ml of 1.00M potassium hydroxide KOH in a coffee cup calorimeter
For the reaction 2HCl+Na2CO3 →2NaCl+H2O+CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP?
If your titration solution is 0.431 M in NaOH, and the endpoint occurs at 13.20 mL of titrant, how many mmol of NaOH are required to reach the endpoint
Calculate the expected pH of the buffer after the addition of 1.0 mL of 1 M HCl. Remember that you are using 50 ml of the buffer so be sure to calculate the number of moles of acetic acid
According to the solubility rule, silver will precipitate with SO42- but doing my lab i found no precipitation when i added AgNO3
Nitrogen Oxide is a pollutant in the lower atmosphere that irritates the eyes and lungs and leads to the formation of acid rain. Nitrogen oxide forms naturally in the atmosphere according to the following endothermic reaction
The strengths of oxidants and reductants on opposite sides of redox equations correlate oppositely. For a strong reductant Eored should be negative.
Did an experiment where we extracted the caffeine in 1 bag of tea. We added the bag of tea leaves to the solution where the sodium carbonate solution. Explain what the purpose of adding the sodium carbonate was.
Why should a distilling flask be filled to not more than two-thirds of its capacity at the beginning of a distillation procedure?
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