Exit Ticket: 10/9/14 CH 25.1
1) What is a radioactive isotope?
2) What causes an atom to be radioactive?
3) What are the three
types of nuclear
radiation, and how
dangerous are they?
Entrance Ticket: 10/10/14
NUCLEAR CHEMISTRY CH 25.1
1) Explain what an alpha particle is.
2) If a radioactive atom (radioisotope)
emits an alpha particle, what would the
nucleus be losing?
3) What is a beta particle? How is a beta
particle emitted from the nucleus?
Answers
1) Explain what an alpha particle is: particle
made up of 2 protons & 2 neutrons (Helium
nucleus)
2) If a radioactive atom (radioisotope) emits
an alpha particle, what would the nucleus be
losing: 2 protons & 2 neutrons
3) What is a beta particle? How is a beta
particle emitted from the nucleus: high
speed electron emitted from the nucleus
when a neutron turns into a proton.
Entrance Ticket: 10/11/14
1) Write out the nuclear reaction of the
alpha decay of Radon 226.
2) What radioisotope alpha decays into
Lead 209?
3) Write out the beta decay of Carbon 14.
Answers to 25.1 worksheet
1.) radioactive
2.) radioisotopes
3.) nuclei
4.) stable
5.) energy
6.) beta
7.) Alpha
8.) helium
9.) electrons
10.) metal foil
11.) Gamma
12.) mass
13.) Lead/concrete
14.) Lead/concrete
15.) stop
16.) ST
17.) NT
18.) AT
19.) NT
20.) AT
21.) b
22.) a
23.) c
24.) e
25.) d
Entrance Ticket 4/22/15
Nuclear Chem. Review and ½ life:
1) What is a radioactive isotope? (p. 799)
2) What causes an atom to be
radioactive?
3) What is half-life? (pp. 804-806)
Entrance Ticket 4/22/15
1) What is a radioactive isotope?
An element that has an unstable nucleus
2) What causes an atom to be
radioactive? The nucleus is too big or
the ratio of protons to neutrons is
unfavorable.
3) What is half-life? The amount of time it
takes half of a radioactive sample to
decay into products
practice
1) Manganese-56 is a beta particle emitter
with a half-life of 2.6 hours.
a) Write out this nuclear reaction.
b) Calculate how much Manganese56 you would have remaining after 10.4
hours if you had 30 grams to start with.
2) Thorium-234 has a half-life of 24.1 days.
Will all of the thorium undergo
radioactive decay in 48.2 days? Explain.
Please get out your half-life lab
(p.40) and tear out a piece of graph
paper
Half Life Lab
-Half life is the amount of time it takes
for half of a radioactive sample to
decay.
We will be using pennies to represent a
sample of a radioactive isotope.
Each time you dump the pennies, that
represents a half life.
Entrance Ticket 4/23/15
1) Please write out the nuclear reaction for
the alpha decay of Thorium-230.
2) A radioisotope has a half-life of 20
seconds. How much of a 100 gram
sample remains after 1 minute?
Half Life Review
1) If a radioisotope has a half life of 3.5 hours,
how many half lives has it gone through in
10.5 hours
2) Using #1, how much of an 18 gram sample
would remain radioactive after 7 hours?
3) Using #2, how much time has passed if
1.125 grams of the original sample
remains?
Half Life Review Answers
1) The radioactive sample would go
through 3 half lives.
2) After 7 hours, 4.5 grams would still be
radioactive.
3) 14 hours has past if 1.125 grams are still
radioactive.
Review 4/27/15
1) Please write out the nuclear reaction of
the alpha decay of Bismuth-214.
2) If Copper-66 becomes Zinc-66 after it
has gone through radioactive decay,
what type of decay did it emit?
Half Life Review
1) If a radioisotope has a half life of 1.5 hours,
how many half lives has it gone through in
4.5 hours?
2) How much of an 20 gram sample would
remain radioactive after decaying for 4.5
hours if its half life is 1.5 hours?
3) Using #2, how much time has passed if 1.25
grams of the original sample remains?
Half Life Review
1) 3 half lives
2) 2.5 grams
3) 6 hours
Nuclear Fission and Fusion
Describe the process of nuclear
fission and nuclear fusion.
How does the energy released
compare to a chemical reaction?
Which nuclear reaction releases
more energy?
Reading….A Murder Mystery
1) Do you think Alexander Litvinenko
was murdered? Why?
2) What killed Alexander Litvinenko?
3) Who is responsible for his death?
4) What is the motive?
Nuclear Chemistry wrap up (on e.t.)
Please write a 6-8 sentence paragraph
about nuclear chemistry. Use the
knowledge that you now have about
radioisotopes, radiation, half-life,
fission and fusion. You have the
freedom to focus on whatever you
like, as long as it is about concepts
we have learned in nuclear chem.
Make sure to have a topic sentence,
concrete details and a concluding
sentence.
Acid Base Titration Lab
Reaction #1:
HCl(aq) + NaOH(aq)  NaCl (aq) + H2O(l)
Reaction #2:
H2SO4 (aq) + NaOH(aq)  Na2SO4(aq)+ H2O(l)
Titration Lab
Reaction #2:
H2SO4 (aq) + NaOH(aq)  Na2SO4(aq)+ H2O(l)