Calculations

When 5.000 g of NaHCO₃ is added to 600.0 g of water in a ‘coffee cup calorimeter’, the temperature decreases from 21.52°C to 19.07°C.

a) Calculate q_calorimeter, in joules, assuming the specific heat capacity of the solution is the same as pure water: 4.186 Jg^-1K^-1.

Report your value to 4 significant figures, and do not include units in your answer.

Results

Graphs:

• ΔT vs the mass fraction of citric acid 
  Image failed to load: mass fraction
• ΔT vs the mole fraction of citric acid 
  Image failed to load: molar fraction

Upload a single PDF of your two graphs here.

Marking Rubric per graph (0.5 marks each, 3 marks total/graph):

• Title
• Labelled axis (including units)
• Scale of graph (appropriate and even)
• Minimum of 7 data points recorded per graph
• Negative ΔT values
• Line of best fit

A uni student is listening to Top 40 Music on her FM radio, tuned into a wavelength 3.02 m. Convert this value into a frequency, in MHz.

Use the speed of light, c = 3.00 x 10⁸ ms^-1.

Give your answer to 3 significant figures. Do not enter units!

Police often monitor traffic with K-band radar guns, which operate in the microwave region, for example at 29.389 GHz. (Note that 1GHz = 10⁹Hz). Find the wavelength in of the radiation and report this in nm. (Note that 1nm = 10^-9m).

Give your answer to 3 significant figures. Do not enter units!

Match the name of the quantum number with its symbol.