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Thursday_26: Calculating Ar
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CHEMISTRY 9
16 - Isotopes
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Slide 1:
Diapositive
Chemistry
Secondary Education
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Pres_Template
CHEMISTRY 9
16 - Isotopes
Slide 1 - Diapositive
state the
A
r
equation
use the
A
r
equation
to calculate elements' relative atomic mass
reflect on my thinking and learning using the self-reflection checklist.
Daily Review
Slide 2 - Diapositive
Complete the table in your notebook.
Use your pen to complete your task.
timer
3:00
Sulfur
Chlorine
Argon
Potassium
Calcium
Slide 3 - Diapositive
Complete the table in your notebook.
Use your pen to complete your task.
timer
3:00
Sulfur
Chlorine
Argon
Potassium
Calcium
S
C
l
Ar
K
Ca
16
-16
+16
17
-17
+17
18
19
20
-18
-19
-20
+18
+19
+20
Starter
Slide 4 - Diapositive
Open your Google Classroom.
Look for " I need to read this in advance.".
Slide 5 - Diapositive
Open your Google Classroom.
Look for " I need to read this in advance.".
Main Lesson
Slide 6 - Diapositive
Isotopes
Similarities
same chemical characteristics
appearance, so a sample of C-14 would look no different from C-12
Differences
Neutrons within the nucleus and mass only
Differences in mass affect physical properties such as density, boiling point, and melting point
Slide 7 - Diapositive
Relative atomic mass
A unit called the relative atomic mass (A
r
) is used
Relative atomic mass unit =
1/12
th
the mass of a carbon-12 atom
Slide 8 - Diapositive
Relative atomic mass
A unit called the relative atomic mass (A
r
) is used
Relative atomic mass unit =
1/12
th
the mass of a carbon-12 atom
Slide 9 - Diapositive
Imagine you have
90 balls
with a mass of
200 g
and
10 balls
with a mass of
300 g
. The
average mass
of the balls is given by:
Slide 10 - Diapositive
Imagine you have
90 balls
with a mass of
200 g
and
10 balls
with a mass of
300 g
. The
average mass
of the balls is given by:
Slide 11 - Diapositive
Imagine you have
90 balls
with a mass of
200 g
and
10 balls
with a mass of
300 g
. The
average mass
of the balls is given by:
Sample:
Slide 12 - Diapositive
Pres_Template
CHEMISTRY 9
16 - Isotopes
Slide 13 - Diapositive
state the
A
r
equation
use the
A
r
equation
to calculate elements' relative atomic mass
reflect on my thinking and learning using the self-reflection checklist.
Practice Activity
Slide 14 - Diapositive
Guided Practice: You do it together!
Prepare your notebook and pen.
Prepare the calculator of your device or a calculator.
Look for the copy of the
A
r
worksheet in your notebook.
Calculate the
A
r
of the given elements.
Share your work with the class.
timer
15:00
Plenary session
Slide 15 - Diapositive
Slide 16 - Diapositive
state the
A
r
equation
use the
A
r
equation
to calculate elements' relative atomic mass
explain the difference between mass number and relative atomic mass
Slide 17 - Diapositive
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La durée de la leçon est: 50 minLa durée de la leçon est: 50 min
