The marginal propensity to consume:

If Marios is a consumption smoother and has just won a prize of $12,000, we can expect Marios to exhibit:

Given that 1 mol of an ideal gas has a volume of 24.5 L at room temperature and pressure, how many mols should be found in the 60mL of air in the syringe?

= mols

The experiment you are about to see is measuring isothermal compression.

During the experiment process, masses are added to the top of the syringe. We always wait a while between adding masses to the syringe; why?

Why is it important that we let the syringe cool down before adding more mass?

The temperature change in the syringe is measured with a low temperature thermistor. The response time on the thermistor is around half a second. Why is it not possible to measure the temperature instantaneously?

You wish to view a live bacterial cell that contains no natural pigments or fluorophores.  Which one of the following would be the most appropriate microscope for this task?

A.    A bright field microscope

B.    A phase contrast microscope  

C.    A fluorescent microscope

D.    An oil immersion microscope

(i)  Which response (A-D) is the best choice? (1 mark)

(ii ) Briefly explain your reasoning for your choice (2 marks)

You are performing a Gram stain on an unknown bacterium.  You proudly show your pink bacilli to your facilitator who sadly shakes her head and says they should have been purple.  Which one of the following is the best explanation for where you went wrong?

A.   You forgot to add the carbol fuschin

B.   You forgot to add the iodine

C.   You skipped the alcohol decolourisation step

D.   You didn’t fix your cells to the slide before staining

(i)   Which response (A-D) is the best choice? (1 mark)

(ii)  Briefly explain your reasoning for your choice (2 marks)