Chem Lab 1A Notes

Calculating Standard Deviation Steps:

1. Calculate mean = sum of the numbers divided by the total count of the numbers.

2. Take each number and subtract by the mean then square it (add them all together)

3. Divide that total number by the total count of numbers subtracted by 1

4. Square root the value

• Formulas:

  • Density = Mass/Volume

  • Volume= Mass/Density

  • Energy = hv

    • Relationship between the energy of light and its frequency

    • v = frequency

    • h = photons constant = 6.6262×10^-34 J

  • wavelength symbol: λ (lambda)

  • Calculating concentration:

    • A = mx+b

  • Calculating % cu mass in penny steps

    • 1). Moles of Cu = concentration * Volume of element

    • 2). Mass of Cu = Moles of Cu * molar mass of cu

    • 3). (mass of cu / mass of penny)100%

    • Rydbergs constant = 1.097×10^7 m^-1

Emission of Light from Hydrogen and Metal Atoms:

Ultraviolet:

• Highest Energy

• Highest Frequency

• Lowest wavelength

Infrared:

• Medium everything (energy, frequency, wavelength)

Visible light:

• Lowest Energy

• Lowest Frequency

• Highest Wavelength

Isomers:

1. Cis

   1. On the same side

   2. Polar

2. Trans

   1. On opposite sides

   2. Nonpolar