do now – density review (show work) 1. find the density of an object that has a mass of 10g and a...
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DO NOW – DENSITY REVIEW (SHOW WORK)
1. Find the Density of an object that has a mass of 10g and a volume of 5 cm3.
2. Find the Density of an object that has a mass of 5g and a volume of 10 cm3.
3. Find the mass of an object that has density of 2g/cm3 and a volume of 5cm3.
4. Find the volume of an object that has a mass of 100g and a density of 25g/cm3. D vX
÷ ÷m
D = m ÷ v D = 10 ÷ 5 D = 2 g/cm3
D = m ÷ v D = 5 ÷ 10 D = .5 g/cm3
m = D x v m = 2g/cm3 x 5cm3
m = 10g
v = m ÷ Dv = 100g ÷ 25g/cm3v = 4cm3
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HOMEWORK AND ANNOUNCEMENTS
Due Today: vocabulary word find
Science Fair – written summaries and updated forms.
Chapter 9 textbook pages 322-327 (grade tomorrow)
USA TestPrep (due today)
Quarter 1 Extra Credit deadline (Monday 10/26/15)
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L.O. SWBAT use the periodic table to determine the number of p+ and e- in an atom.
Using the Periodic Table
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Chemical Symbol Represents an element 1 or 2 letters 1st letter capitalized & 2nd
letter lower case Example:
C = Carbon O = Oxygen Co = Cobalt
Non-Example CO = Carbon monoxide (Compound: Carbon and Oxygen)
6
C
12.01
Chemical Symbol
Carbon
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1. Oxygen
2. Lithium
3. Beryllium
4. Potassium
5. Argon
6. Chlorine
7. Phosphorus
8. Aluminum
9. Silver
10.Tin
O
Li
Be
K
Ar
Cl
P
Al
Ag
Sn
Use your periodic table to find the chemical symbol for the following elements.
(Write the element and your answer in your notes)
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Atomic Number Equals # of protons in
an atom. Equals # of electrons
in an atom. Each element has a
different atomic number.
6
C
12.01
Atomic Number
Carbon
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1. Oxygen
2. Lithium
3. Beryllium
4. Potassium
5. Argon
6. Chlorine
7. Phosphorus
8. Aluminum
9. Silver
10.Tin
8
3
4
19
18
17
15
13
47
50
Use your periodic table to find the atomic number for the following elements.
(Next to the chemical symbol, write the # of p+.)
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Atomic Number Average mass of an
element’s atoms.6
C
12.01 Atomic Mass
Carbon
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1. Oxygen
2. Lithium
3. Beryllium
4. Potassium
5. Argon
6. Chlorine
7. Phosphorus
8. Aluminum
9. Silver
10.Tin
16
7
9
39
40
35
31
27
108
119
Use your periodic table to find the atomic mass for the following elements.
(Write the atomic mass in your notes)
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A little math…
Atomic Mass- Atomic Number # of neutrons
6
C
12.01 Atomic Mass
Carbon
Atomic Number
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Try it!!
How many neutrons does a carbon atom have?
6
C
12.01 Atomic Mass
Carbon
Atomic Number 12
- 6 6 neutrons
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5B
Boron10.81
2He
Helium4.003
11Na
Sodium22.990
17Cl
Chlorine35.453
Raise your hand to answer the following.
1. What is the atomic number for Chlorine?
2. What is the atomic number for Boron?
3. How many protons are in an atom of Na?
4. How many protons are in an atom of He?
5. How many electrons are in an atom of Cl?
6. How many protons are in an atom of Chlorine?
7. What is the atomic mass of Helium?
8. How many neutrons does Helium have?
17
5
11
2
17
17
4
4 – 2 = 2
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+
+
+nn
n
n
e-
e-
e-
What do you see?Protons:____Electrons: ____Neutrons:____Mass Number: ________
What do you know?Atomic Number: ____Element Name: ________Chemical Symbol:____Avg. Atomic Mass: _____
e- + n
Practice
What do you know!
101012
p+ + n = 22
10
NeNeon
20.18
e-
e-
e-
e-
e-
e-+
+++
+
+
n
n
n
n
n
n
n
Hints:
p+ = 10n = 12mass number = (p+) + n
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Summary (3-4 sentences)
Today I learned about…
Helper questions How do we determine the number of p+ an atom has?
Electrons?Netrons?
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Independent Work
Textbook Pages 322-327 Vocabulary Word Find
definitions (in notebook)