Module 2

Question 1

Isotope

Answer 1

Two or more types of atoms that have the same atomic number but differ in atomic mass.

Question 2

Isotopic abundance

Answer 2

The natural abundance of isotopes of a particular element

Question 3

How does a mass spectrometer work?

Answer 3

Vaporization - Molecules are converted to the gas phase via heating
Ionization - Electron beam bombards vapor thus turning them into ions so that can be detected.
Acceleration - Positive ions accelerate to the negative plates at a speed dependent on their mass.
Deflection - Ions are deflected by a magnetic field, with the extent of deflection determined by their mass.
Detection - Ions of increasing mass eventually reach the detector one after another, and then it’s over to the computer to provide a spectrum.

Question 4

Ideal gas law assumptions

Answer 4

Gases have negligible volume(point mass)
have negligible attractive forces(untrue!)
move in constant, random, straight lines
perfectly elastic collisions

Question 5

Relationship between temperature and kinetic energy

Answer 5

Temperature is directly proportional to kinetic energy

Question 6

Relationship between temperature and particle speed

Answer 6

Temperature is directly proportional to particle speed

Question 7

Relationship between molar mass and particle speed

Answer 7

Molar mass is inversely proportional to particle speed.

Question 8

Relationship between Density and molecular mass

Answer 8

Directly proportional

Question 9

Relationship between density and temperature

Answer 9

Inversely proportional