Final Revision Lesson for last SAC

Final Revision Lesson for last SAC

You are going to need a caluclator immediately!

Open Ended

Calculate the volume of water required at SLC to hydrolyze 0.4 mol of triglyceride (Vm - 24.8L)

Open Ended

A food chemist is comparing the melting points of two different triglycerides. One tryglyceride consists mostly of oleic fatty acid residues, and the other consists of stearic acid residues. Explain which triglyceride is likely to be a wax at room temperature and which is most likely to be an oil (3 m)

Balancing big ass combustion equations

• Balance carbons first

• then balance hydrogens

• count the number of oxygens on the PRODUCTS SIDE

• subtract any oxygens in the fuel

• halve what you have left and add that to the oxygen (doesn't matter if it is a fraction

Example: Show the combustion of a lipid with the chemical formula C₃₉H₇₄O₆.

• C₃₉H₇₄O₆ + O₂ --> CO₂ + H₂O

• C₃₉H₇₄O₆ + O₂ --> 39CO₂ + 37H₂O

• (39 x 2) + 37 = 115

• 115 - 6 = 109

• C₃₉H₇₄O₆ + 54.5O₂ --> 39CO₂ + 37H₂O

WARNING: You may have to find the chemical formula of the fuel yourself!

Multiple Choice

Example - What is the molar mass of a trisaccharide if each monomer has a molar mass of 180g/mol

• 540 g/mol

• 504 g/mol

• 486 g/mol

• 522 g/mol

Open Ended

Write the balanced chemical question for the combustion of the disaccharide maltose, which is composed of two glucose monomers (Mr of glucose - 180g/mol) (1m)

Open Ended

A chemist wanted to find the energy contest of maltose. He calibrated a calorimeter by running a 2.4A current with 1.0V for 2 Minutes. He obtained a temperature increase of 15.6 degrees Celcius. What is the calibration factor of this calorimeter? (2m)

Open Ended

What does a calibration factor tell the chemist? (1)

Open Ended

What percentage of energy did the water actually absorb from the battery pack? The calorimeter contains 250g of water (2)

Open Ended

The chemist used the graph attached to find the change in temperature. Explain how would you use this graph to find the temperature change, and why this method is more accurate.

Open Ended

10.g of maltose was completely combusted in the calorimeter, and a temperature change of 32.4 degrees Celcius was achieved. What is the energy content of maltose in kJ/mol (3)

Here you can see two different amino acids

Multiple Choice

What is the strongest type of intermolecular bonding occurring between them?

• Dispersion

• Dipole Dipole

• Hydrogen

• Ionic

Open Ended

An experiment was run of the effectiveness of lipase, an enzyme secreted into the small intestine that helps the hydrolysis of lipids. Two test tubes containing olive oil were placed in water baths, one at 37 and one at 45 degrees. What could you do to measure the rate of hydrolysis of the olive oil? (1m)

Open Ended

No change was seen in the test tube in the water bath at 45 degrees. Explain why this result was obtained (3marks)