Transcript Day 75 Nuclear Chemistry

Starter: Acid or Base
Directions: Identify as Acid or Base
1. H2SO4
2. Ca(OH)2
3. HNO3
4. KOH
5. H3PO4
6. HCl
7. NH4OH
8. Al(OH)3
9. H2SO4
10. HNO3
Nuclear Chemistry
Day 78
Learning Target
• I can identify acids and bases.
• I can complete an acid and base equation.
• I can identify alpha, beta, and gamma
decay.
Explain: Acid,Base, and Salt
Directions: Copy in your notebook.
When you mix an acid with a base you make a
Salt and Water.
Equation
Acid + Base Salt + Water
Example:
HCl + NaOH  NaCl + H2O
(Acid)(Base)
(Salt)(Water)
Explain: Salt Equations
Practice Problems: Teacher Explains:
H2SO4 + Ca(OH)2 → __ + H2O
2. HNO3 + KOH → __ + H2O
3. H2CO3 + NaOH → __ + H2O
4. H3PO4 + Ca(OH)2 → __ + H2O
5. HC2H3O2 + KOH → __ + H2O
6. HCl + NH4OH → __ + H2O
7. H2SO4 + Mg(OH)2 → __ + H2O
8. HNO3 + NH4OH → __ + H2O
9. HNO3 + Al(OH)3 → __ + H2O
Review: Acid and Base
Directions: On the left-side, Using your
foldable write acid or base with the correct
pH. write the household item with the pH.
Example pH=3 acid (Lemon juice)
pH=7
pH=13
pH=12
pH=11
pH=9
pH=1
pH=8
pH=2
Explain: Nuclear Chemistry
Isotopes
Carbon-14 or C-14 or
Carbon-12 or C-12 or
Nuclear Chemistry Foldable
Direction:
Step 1: Fold paper the long way.
Step 2: Fold the paper into three boxes. (Fold the
bottom of the paper over. Then fold the top of
the paper over the bottom. You should have
made a square.)
Step 3: In the top box write the word Alpha in BIG
LETTERS. In the middle box write Beta in BIG
LETTERS. In the bottom box write the word
Gamma in BIG LETTERS.
Step 4: Open foldable up and write the information
on the next slides.
Step 5: Top Left Box
Draw and Write the Following information.
Alpha Particle
Symbol=42He
Mass=4
Charge=2+
•Helium atom with 2p and
2n.
•This particle reduces mass
of an atom by 4 and atomic
number by 2.
•Low energy particle
•Stopped by paper or skin.
Teacher Explains:Alpha Decay
Alpha decay produces an element with a
atomic mass of 2 smaller than the parent
element and a atomic mass of four less.
Teacher Explain: Alpha Nuclear
Decay
• Alpha Decay Equation
Since an atom loses two protons during alpha decay, it changes from one
element to another. For example, after undergoing alpha decay, an atom of
uranium (with 92 protons) becomes an atom of thorium (with 90 protons).
Step 6: Top
Right Box
Copy the
following
equation
238
92
U
Th  He
234
90
4
2
alpha decay gives off alpha
particles, which are 2 neutrons
plus 2 protons
Step 7: Middle Left Box
Draw and Write the Following information.
Beta Particle
Symbol=0-1e
Mass=0.0005
Charge=-1
• Increases the atomic number by 1.
• (a neutron decays into a proton and
emits an electron)
• Can be stopped by clothes or wood.
Teacher Explain: Beta Decay
Beta produces an element with an atomic
mass of one higher than the parent
element but with the same atomic mass.
Small Unstable
Nucleus
Larger Stable
Nucleus
Beta Particle
(electron)
Teacher Explain: Beta Nuclear
Decay
• Beta Decay Equation
Since beta produces a proton and electron with no
change in mass. For example, undergoing a beta decay
Iodine (with 53 protons) becomes an atom of Xenon (with
54 protons) but with the same atomic mass.
Step 8:
Middle Box
Copy the
following
Equation
131
53
I
131
54
Xe  e
0
-1
beta decay means giving off beta
particles, which are basically electrons
Step 9 Bottom Left Box
Gamma Ray
Symbol=γ
Mass=0
Charge=0
• No Change
• Stopped by lead or concrete.
• Given off with an alpha or beta particle.
Elaborate: Nuclear Decay
Worksheet
Directions: Do all work on the worksheet.
Complete the worksheet.