The state of matter that has fixed volume and shape.
What is a solid?
100
The atomic number of an atom tells you the number of which subatomic particle?
Protons
100
What type of intermolecular forces exist between all molecules?
London dispersion forces
100
What is the solvent in TLC?
acetone and water mixture
200
Which is larger 250 mg or 0.300 g?
0.300 g
200
Is distilled water a pure substance, homogeneous mixture, or a heterogeneous mixture?
pure substance
200
How many neutrons are in an atom of Cl-36?
19
200
What type of intermolecular forces predominate in a sample of CH3OH?
Hydrogen bonding
200
What is the absorbent in TLC?
plate coated with silica or alumina
300
The symbol µ represents what decimal power?
10^-6 or 0.000001
300
How would you separate a mixture of salt and iron?
Use magnet to remove iron.
300
The subatomic particle with the smallest mass is ________.
the electron
300
Which evaporates more readily and why: CH3OH or CH3SH?
CH3SH because it has a weaker IM forces since it has only dipole-dipole forces (w/o hydrogen bonding).
300
What determines how fast a molecule will move up a TLC plate?
How similar its polarity is to that of the solvent versus the adsorbent.
400
Which metric prefix is used to designate 1/100?
centi
400
What is the difference between a salt and a molecule?
Salts are ionic while molecules are covalent
400
The type of electromagnetic radiation with the smallest frequency is ________.
radio waves
400
Which has a lower boiling point, I2 or Br2? Explain.
Br2. They both exhibit London dispersion forces, but since Br2 is smaller and has less electrons, it exhibits weaker forces than I2, thus boiling at a lower temperature.
400
If you used a nonpolar solvent in TLC, what can you infer about the substance that travels the shortest distance?
It is most polar.
500
How could the measurement 3.8 x 10^6 L be written using a metric prefix?
3.8 ML
500
What type of matter is air?
Homogeneous mixture
500
What is the most energetic spectrum of visible light?
Violet
500
Which of the following compounds would be more soluble in water, carbon tetrafluoride or sulfur dioxide? Explain.
Sulfur dioxide, since it exhibits dipole-dipole forces, whereas carbon tetrafluoride exhibits London dispersion forces.
500
What is rate of flow (aka retention factor), how is it calculated, and what does it tell you?
Rf tells you the relative polarity of a substance as compared to the solvent used. It is calculated by dividing the distance the sample travels by the distance traveled by the solvent.