TEKS: I CAN recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts (8.5D)
Essential Question: How can we determine the number of atoms in chemical formulas containing subscripts, coefficients, and parentheses? We will discuss chemical formulas, what they represent, and how to count the atoms represented by them.
Pay attention to:
Important vocubulary
How atoms combine
Steps to count atoms
TEKS: I CAN recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts (8.5D)
Set up journal page 35.
Essential Question: How can we determine the number of atoms in chemical formulas containing subscripts, coefficients, and parentheses?
We will discuss chemical formulas, what they represent, and how to count the atoms represented by them.
Pay attention to:
Important vocubulary
How atoms combine
Steps to count atoms
Be sure to write examples of how to count atoms in a chemical formula.
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Question 1
1.
What are the basic units of all matter?
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Question 2
2.
Choose 2 that are pure elements
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Question 3
3.
Which 2 are compounds?
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Question 4
4.
What is the difference between molecules and compounds?
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Question 5
5.
ESSENTIAL QUESTIONS: What does a chemical formula represent?
Add a text box and type your answer.
SENTENCE STEMS:
A chemical formula contains……
The number of atoms….
A ratio….
AS YOU WATCH THE VIDEO, YOU MUST DO THE FOLLOWING:
TAKE NOTES throughout the video- WRITE them on journal page 35
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Question 6
6.
Take additional notes on vocabulary:
subscript
coefficient
Follow all the steps to count atoms:
1. Identify the elements (capital letters)
2. Write the coefficient for ALL
3. Multiply by the subscript for each
4. Multiply by the parenthesis subscript (only elements within the parenthesis)
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Question 7
7.
ESSENTIAL QUESTION: How can we determine the number of atoms of each element?
Add a text box and type your answer.
SENTENCE STEMS:
In order to find the number of atoms of each element……
First,.......then,,,,,
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Question 8
8.
How many total atoms are in the chemical formula?
C₆H₁₂O₆
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Question 9
9.
How many molecules are present?
3C₂H₄O₂
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Question 10
10.
How many Sodium atoms are in the chemical formula?
Na(OH)₂
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Question 11
11.
How many elements are in the chemical formula?
2Cu(NO₃)₂
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Question 12
12.
Using your 6 colored pencils, draw each model on journal page 34.
Complete the following questions to check for understanding.
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Question 13
13.
What is the basic unit of matter?
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Question 14
14.
If an atom has 1 valence electron, what other atoms might it join with to form a chemical bond and form a new chemical compound?
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Question 15
15.
How many different elements are in the formula?
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Question 16
16.
How many total atoms are in the chemical formula?
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Question 17
17.
The coefficient of a chemical formula tells you how many ____ are present.
