1. Let’s Get Started
• Get in equal groups (let’s shoot for 7-8 people
each)
• Pull out a paper and write down the names of
the people in your group.
• Turn on gaming buzzer by holding the on/off
button for 5 seconds
2. 1) What is the pH range for acid?
2) For base?
3) neutral?
28. What is gamma radiation?
How does it differ from alpha
and beta radiation?
29. Answer
-gamma radiation is part of the electromagnetic
spectrum, it has no mass or charge
-beta radiation is a particle similar to an
electron and has negligible mass and -1 charge
-Alpha radiation is essentially a helium atom
with a mass of 4 and a charge of -2
30. If the half life of 100.0 grams of a
radioactive isotope is 8 years, how
many grams will remain after 32
years?
36. A buffer is composed of formic acid
and its conjugate base, the formate
ion. What is the pH of a solution
that has a formic acid concentration
of 0.05 M and a sodium formate
concentration of 0.035 M?
The Ka of formic acid is 1.8 x 10-4.