Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
40 Cards in this Set
- Front
- Back
|
What does amu stand for?
|
atomic mass unit
|
|
|
Where is the proton found?
|
nucleus
|
|
|
Where is the neutron found?
|
nucleus
|
|
|
Where is the electron found?
|
electron cloud
|
|
|
What is the relative mass of a proton?
|
1
|
|
|
What is the relative mass of a neutron?
|
1
|
|
|
What is the relative mass of an electron?
|
1/1837
|
|
|
What is the charge of a proton?
|
+1
|
|
|
What is the charge of a neutron?
|
0
|
|
|
What is the charge of an electron?
|
-1
|
|
|
What is another name for mass number?
|
A number
|
|
|
What is another name for atomic number?
|
Z number
|
|
|
the sum of the protons and neutrons in an atomic nucleus
|
mass number
|
|
|
the number of protons in an atomic nucleus
|
atomic number
|
|
|
What does it mean when an atom of an element is neutral?
|
the number of protons and electrons are the same
|
|
|
How can you determine the number of neutrons in a specific isotope?
|
subtract the z number from the a number
|
|
|
Which goes on top? The atomic number or the mass number?
|
Mass number
|
|
|
Compare the properties of the isotopes of an element
|
Same:
chemical properties Different: -atomic mass -densities -rates of diffusion -slightly on melting and boiling points -nuclear properties (some are radioactive) |
|
|
When is C14 dating good?
|
for once-living material less than 50,000 years old
|
|
|
How does C14 dating work?
|
You compare the ratio of C14 and C12 in an artifact and compare it to the atomosphere's ratio
|
|
|
What is the weakness of C14 dating?
|
Atmospheric ratio is not stable over long periods of time
|
|
|
used to treat various forms of cancer including brain cancer
|
cobalt-60
|
|
|
used to discourage transplant rejection
|
cobalt-60
|
|
|
half-life is 5 years, 4 months; high energy gamma emitter
|
cobalt-60
|
|
|
used to diagnose abnormal thyroid function and to treat thyroid cancer
|
iodine-131
|
|
|
half-life is 8 days; beta and gamma emitter
|
iodine-131
|
|
|
used to treat prostate cancer and brain tumors
|
iodine-125
|
|
|
half-life is 60 days; gamma emitter
|
iodine-125
|
|
|
Diagram a mass spectrometer
|
look on notes
|
|
|
a sample is vaporized at high temperatures
|
vaporization
|
|
|
the atoms of molecules of the sample are bombarded by high energy electrons which cause electrons of the atom or molecule to fall off
|
ionization
|
|
|
What does ionization create?
|
cations
|
|
|
the cations are accelerated so they all have the same kinetic energy
|
acceleration
|
|
|
an electromagnet deflects the paths of the cations according to their mass
|
deflection
|
|
|
Which are deflected the most? Cations with lower mass or higher mass?
|
lower mass
|
|
|
the detector senses the mass of each cation and the number of each so it can report a percentage of each
|
detection
|
|
|
What does the x-axis of a mass spectrometer graph show?
|
mass of cations
|
|
|
What does the y-axis of a mass spectrometer graph show?
|
percent abundance
|
|
|
the peak with the greatest mass (farthest right on the x axis)
|
molecular ion peak
|
|
|
Practice calculating weighted average atomic mass
|
In book
|
