Radioactive decay

10 videos

Mass defect and binding energy

VIDEO 11:28 minutes
Using the mass defect to calculate the energy released when a helium nucleus formed. Introduction to the nuclear strong force.

Nuclear stability and nuclear equations

VIDEO 8:25 minutes
Using the ratio of neutrons to protons to figure out of a nucleus will be stable or radioactive.

Types of decay

VIDEO 17:03 minutes
Alpha, Beta, Gamma Decay and Positron Emission

Writing nuclear equations for alpha, beta, and gamma decay

VIDEO 8:07 minutes
Writing nuclear equations for alpha, beta, and gamma decay.

Half-life and carbon dating

VIDEO 12:31 minutes
Carbon dating is a real-life example of a first-order reaction. This video explains half-life in the context of radioactive decay.

Half-life plot

VIDEO 6:47 minutes
Definition of half-life and graphing the decay of phosphorus-32. Calculating how much phosphorus-32 remains after 57.2 days.

Exponential decay formula proof (can skip, involves calculus)

VIDEO 12:22 minutes
Showing that N(t)=Ne^(-kt) describes the amount of a radioactive substance we have at time T. For students with background in Calculus. Not necessary for intro chemistry class.

Introduction to exponential decay

VIDEO 9:19 minutes
Introduction to Exponential Decay. Using the exponential decay formula to calculate k, calculating the mass of carbon-14 remaining after a given time, and calculating the time it takes to have a specific mass remaining .

More exponential decay examples

VIDEO 7:22 minutes
A few more examples of exponential decay. Practice calculating k from half-life, and calculating initial mass.

Exponential decay and semi-log plots

VIDEO 10:16 minutes
Using exponential decay equation to solve for relationship between k and half-life. Using semi-log plot to get graph of a straight line with slope of -k.