homeworkhomework read section 4.4 answer questions 26 & 27 on page 107
TRANSCRIPT
HomeworkRead section 4.4Answer questions 26 & 27 on page 107.
What you will learn today:
What you will learn today:
What you will learn today:
•nuclear reaction•radioactive decay•alpha particle•beta particle•gamma ray
Chemistry is all about the
electrons.
The nucleus doesn’t get involved in chemical reactions.
But there are such things as nuclear reactions.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
In the late 1800’s, scientists discovered radioactivity.
So what is radioactivity?
In the late 1800’s, scientists discovered radioactivity.
Radioactive source in a lead box
screen
So what is radioactivity?
positive
negative
screen
So what is radioactivity?
positive
negative
So what is radioactivity?
Alpha (α)+2
positive
negative
So what is radioactivity?
Alpha (α)+2
positive
negative
So what is radioactivity?
Alpha (α)+2
positive
negative
Beta (β)-1
So what is radioactivity?
Alpha (α)+2
positive
negative
Beta (β)-1
So what is radioactivity?
Alpha (α)+2
positive
negative
Beta (β)-1
Gamma (γ)0
So what is radioactivity?
alpha particle
α 2 protons + 2 neutrons
mass ≈ 4 AMUcharge = +2
So what is radioactivity?
beta particle
β1 electronmass ≈ 1/1000 AMUcharge = -1
So what is radioactivity?
gamma ray
γpure energymass = 0charge = 0
So what is radioactivity?
226 88Ra
So what is radioactivity?
mass number 226 atomic number 88Ra
So what is radioactivity?
226 88 Ra→
So what is radioactivity?
226 222 88 86 Ra→ Rn
So what is radioactivity?
226 222 4 88 86 2Ra→ Rn+ He
So what is radioactivity?
226 222 4 88 86 2Ra→ Rn+ Heradium-226
So what is radioactivity?
226 222 4 88 86 2Ra→ Rn+ Heradium-226 radon-222
So what is radioactivity?
226 222 4 88 86 2Ra→ Rn+ Heradium-226 radon-222 alpha particle
So what is radioactivity?
radium-226 radon-222 alpha particle
So what is radioactivity?
238 234 4 0 92 90 2 0U→ Th+ He + 2 γ
So what is radioactivity?
238 234 4 0 92 90 2 0U→ Th+ He + 2uranium-238 thorium-234 alpha particle gamma ray
γ
So what is radioactivity?
uranium-238 thorium-234 alpha particle gamma ray
So what is radioactivity?
14 14 0 6 7 -1C→ N + β
So what is radioactivity?
14 14 0 6 7 -1C→ N + βcarbon-14 nitrogen-14 beta particle
So what is radioactivity?
So what is radioactivity?
So what is radioactivity?
So what is radioactivity?
HomeworkRead section 4.4Answer questions 26 & 27 on page 107.