This is HL #18. Head your loose leaf paper correctly, using blue/black ink or pencil. Record answers only. The title of the sheet is Content Review. Be sure to record answers only: for numbers 1-5, write only the word that best describes the drawing; for numbers 6-13, choose the correct word or phrase from the trio of choices provided and record ONLY the correct choice on your paper.
Students will be able to:
use information from videos from the internet, internet access and classroom discussion to
-define radioactive decay.
-define half-life.
-describe how radioactive isotopes are used.
Students completed notes from Friday on the structure of atoms as their do now. You can find those notes listed under Friday's blog, below this entry.
Students reviewed the directions for HL #18, which can be found at the top of this blog.
Students then watched BrainPop movies on radioactivity and isotopes.
Students then participated in the Ylearn online learning system. To access the information on radioactivity, visit Dr. Gayden's Science Zone (drgcdms.podomatic.com), click the link to ylearn.co.uk. Once on the login page, enter your name and the access code Gayden-atom, then click start class assignment. Click the start button to view the activity.
You can view all slides, do all questions and reviews, but the most important slides for radioactivity are slides 17-34. In addition, be sure you record uses for radioactive isotopes.
Here is a summary of the information studied today:
Radioactivity
Isotope-atoms of the same element with different numbers of neutrons in the nucleus and different atomic masses
Radioactive decay-release of nuclear particles and energy from unstable atomic nuclei
Half-life-time needed for one-half of a sample of a radioactive isotope to decay
Henri Becquerel discovered radioactivity
Types of Radioactivity
-alpha particles-interact strongly with surrounding matter
-very large
-made of 2 protons and 2 neutrons
-don’t travel far
-beta particles-streams of fast moving negatively charged electrons
-smaller than alpha particles
-more penetrating than alpha particles
-gamma particles-carry no particles of any detectable mass or charge
-shorter wavelength than X-rays
-very penetrating
Uses for radioactive isotopes
-nuclear power plants
-sensors in devices like smoke alarms
-medicine for pacemakers or X-rays
-archeological dating