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Name: _________________________________________________ Date: __________________ Period: _____
Chemistry
Packet#9 Using Chemical Formulas
Edmodo Group Code: ozm60q (http://www.edmodo.com)Class Website: http://mrgchem.weebly.com
Mr. Gutierrez’s email: [email protected] Messaging Reminders: Text @aofchem to 23559
Note: You are expected to work on this packet during the allotted class practice time. Packet Points
/35 Completed Class Notes
/35 Completed Classwork
/5 Writing Name on Every Page
/25 Handed Packet in on Time
/ Homework
/ Followed Classroom Policies
/ Classwork Participation
/ TOTAL POINTS
Name of Chemist:__________________________________________________________________
Period: ___________
DUE _________________________*All Class Notes + Questions MUST be finished for
HOMEWORK if not done in class.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 1
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Name: _________________________________________________ Date: __________________ Period: _____
Using Chemical Formulas
Table of Contents
Topic Pages Textbook Pages Supplementary Materials
(Video or Notes)1. Molar Mass 3 - 8 238 - 239
2. Percentage Composition
9 - 14 242 - 244
3. Mass-Mole Conversions
15 - 20 240 – 241
4. Avogadro’s Number
21 - 30 241 - 242
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 2
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Name: _________________________________________________ Date: __________________ Period: _____
Date: _________________Objectives: 1) SWBAT calculate molar mass of a compound or element given the chemical formula.
Class NotesMolar Mass
Calculating Molar Mass
EXAMPLE#1: H2SO4 sulfuric acid
EXAMPLE#2: Mg(ClO3)2
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 3
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Name: _________________________________________________ Date: __________________ Period: _____
Practice Samples
You may try Sample A with a partner if you still do not feel comfortable. Complete Samples B and C INDEPENDENTLY. SHOW ALL YOUR WORK.
Practice Sample A Calculate the molar mass of H3PO4.
Practice Sample B Calculate the molar mass of LiCl.
Practice Sample C Calculate the molar mass of aluminum phosphate.
Once you are finished, have Mr. Gutierrez check your work before continuing to the next question.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 4
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Name: _________________________________________________ Date: __________________ Period: _____
Date: _________________Objectives: 1) SWBAT calculate molar mass of a compound or element given the chemical formula.
Class WORKClass Work (Independent Practice) Directions: Finish as many questions as you can during class. Refer to your notes and ask at least three classmates before asking me for help. If you do not finish these questions in class, you must finish them for homework.
Part A.Directions: Calculate the molar mass of the following compounds. SHOW ALL YOUR WORK. You will not receive credit if you do not show your work.
1. NaHCO3
2. Na2CO3
3. CuSO4
4. Mg(OH)2
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 5
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Name: _________________________________________________ Date: __________________ Period: _____
5. Ba(NO3)2
6. Li2SO4
7. MgCl2
8. AgNO3
9. Al2(SO4)3
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 6
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Name: _________________________________________________ Date: __________________ Period: _____
10. Ca(OH)2
Part B.Directions: 1) Write the chemical formula of each of the following compounds. 2) Calculate the molar mass. SHOW ALL YOUR WORK. You will not receive credit if you do not show your work.
1. sodium acetate
2. potassium permanganate
3. magnesium bromate
4. lithium nitrate
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 7
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Name: _________________________________________________ Date: __________________ Period: _____
5. calcium nitrite
6. lithium perchlorate
7. sodium phosphate
8. potassium dichromate
9. calcium carbonate
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 8
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Name: _________________________________________________ Date: __________________ Period: _____Date: _________________Objective: SWBAT calculate percentage composition.
Class NotesPercentage Composition
Calculating Percentage Composition
Formula:
Example: HCN
STEPS EXAMPLE1. Calculate molar mass.
2. Divide the masses of each element by the molar mass. (Be sure to multiply the molar mass of each element by the subscript of the element. Remember no subscript meansone.)
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 9
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Name: _________________________________________________ Date: __________________ Period: _____3. Multiply each decimal by 100 and write the percentage sign after.
FINAL ANSWER
EXAMPLE#1:Calculate the percentage composition of Mg(ClO3)2.
EXAMPLE#2:Calculate the percentage composition of H2SO4
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 10
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Name: _________________________________________________ Date: __________________ Period: _____Practice Samples
You may try Sample A with a partner if you still do not feel comfortable. Complete Samples B and C INDEPENDENTLY. SHOW ALL YOUR WORK.
Practice Sample A Calculate the percentage composition of H3PO4.
Practice Sample B Calculate the percentage composition of LiCl.
Practice Sample C Calculate percentage composition of aluminum phosphate.
Once you are finished, have Mr. Gutierrez check your work before continuing to the next question.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 11
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Name: _________________________________________________ Date: __________________ Period: _____Date: _________________Objective: SWBAT calculate percentage composition.
Class WORKClass Work (Independent Practice) Directions: Finish as many questions as you can during class. Refer to your notes and ask at least three classmates before asking me for help. If you do not finish these questions in class, you must finish them for homework.
Calculate the PERCENTAGE COMPOSITION OF EACH COMPOUND.
1. NaHCO3
2. Na2CO3
3. CuSO4
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 12
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Name: _________________________________________________ Date: __________________ Period: _____
4. Mg(OH)2
5. Ba(NO3)2
Part B.
Directions: 1) Write the chemical formula of each compound. 2) Calculate the percentage composition of each compound.
1. Lithium fluoride
2. Potassium dichromate
3. Sodium phosphate
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 13
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Name: _________________________________________________ Date: __________________ Period: _____
4. Magnesium phosphate
5. Nickel (II) chloride
6. Calcium nitride
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 14
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Name: _________________________________________________ Date: __________________ Period: _____
Date: _________________Objective: SWBAT use molar mass to convert between grams and moles.
Class NotesMass to Mole Conversions
Converting Mass to Moles
Example#1:
How many moles are there in 25 grams of CO2?
STEPS EXAMPLE1. Calculate molar mass.
2. Write given and multiply by conversion factor.
FINAL ANSWER
EXAMPLE#2:"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 15
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Name: _________________________________________________ Date: __________________ Period: _____How many grams are there in 3.5 moles of water?
EXAMPLE#3:How many moles are there in 45 grams of HCO3?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 16
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Name: _________________________________________________ Date: __________________ Period: _____Practice Samples
You may try Sample A with a partner if you still do not feel comfortable. Complete Samples B and C INDEPENDENTLY. SHOW ALL YOUR WORK.
Practice Sample A How many grams are there in 3.23 moles of H3PO4?
Practice Sample B How many moles are there in 30 grams of MgCl2?
Practice Sample C How many grams are there in 2.7 moles of aluminum phosphate?
Once you are finished, have Mr. Gutierrez check your work before continuing to the next question.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 17
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Name: _________________________________________________ Date: __________________ Period: _____
Date: _________________Objective: SWBAT use molar mass to convert between grams and moles.
Class WORKClass Work (Independent Practice) Directions: Finish as many questions as you can during class. Refer to your notes and ask at least three classmates before asking me for help. If you do not finish these questions in class, you must finish them for homework.
Convert. SHOW ALL YOUR WORK. You will not receive credit if you do not show your work.
1. How many grams are there in 9 moles of NaHCO3 ?
2. How many moles are there in 30 grams of Na2CO3 ?
3. How many moles are there in 54.3 grams of CuSO4 ?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 18
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Name: _________________________________________________ Date: __________________ Period: _____
4. What is the mass of 7.43 moles of Mg(OH)2 ?
5. Calculate the number of moles in 200 grams of Ba(NO3)2
6. How many grams are there in 6 moles of lithium fluoride?
7. How many moles are there in 300 grams of sodium phosphide?
8. How many moles are there in 235 grams of potassium chlorate?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 19
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Name: _________________________________________________ Date: __________________ Period: _____9. Convert 300 grams of magnesium phosphate to moles.
10.How many grams are there in 4.28 moles of Nickel (II) chloride?
11.What is the mass of 4 moles calcium nitride?
Date: _________________
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 20
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Name: _________________________________________________ Date: __________________ Period: _____Objectives: 1) SWBAT define Avogadro’s number. 2) SWBAT convert between moles and particles using Avogadro’s number.
Class NotesAvogadro’s Number
1 mole of a substance =
Converting between Moles and Particles
Example#1:
How many molecules are there in 3.54 moles of CO2?
1. Write given and multiply by conversion factor using Avogadro’s number.
FINAL ANSWER
EXAMPLE#2:How many moles are in 1.55 x 1023 molecules of potassium?
EXAMPLE#3:
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 21
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Name: _________________________________________________ Date: __________________ Period: _____How many moles are there in 4.5 x 1026 molecules of aluminum sulfate?
Practice Samples
You may try Sample A with a partner if you still do not feel comfortable. Complete Samples B and C INDEPENDENTLY. SHOW ALL YOUR WORK.
Practice Sample A How many molecules are there in 3.23 moles of H3PO4?
Practice Sample B How many moles are there in 300 molecules of MgCl2?
Practice Sample C How many molecules are there in 2.7 moles of aluminum phosphate?
Once you are finished, have Mr. Gutierrez check your work before continuing to the next question.
Date: _________________Objectives: 1) SWBAT define Avogadro’s number. 2) SWBAT convert between moles and particles using Avogadro’s number.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 22
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Name: _________________________________________________ Date: __________________ Period: _____
CLASS WORKClass Work (Independent Practice) Directions: Finish as many questions as you can during class. Refer to your notes and ask at least three classmates before asking me for help. If you do not finish these questions in class, you must finish them for homework.
Convert. SHOW ALL YOUR WORK. You will not receive credit if you do not show your work.
1. How many moles are there in 9.5 x 1020 molecules of NaHCO3 ?
2. How many molecules are there in 3 moles of Na2CO3 ?
3.How many particles are there in 5.3 moles of CuSO4 ?
3. How many particles are there in 7.43 moles of Mg(OH)2 ?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 23
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Name: _________________________________________________ Date: __________________ Period: _____
4. How many moles are there in 3.5 x 1020 particles of Ba(NO3)2
5. How many moles are there in 1.5 x 1050 molecules of lithium fluoride?
6. How many moles are there in 500 particles of an element?
7. How many molecules are there in 50 moles of potassium chlorate?
8. Convert 5.673 x 1012 molecules of oxygen to moles.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 24
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Name: _________________________________________________ Date: __________________ Period: _____
9. Convert 9.35 x 103 particles to moles.
10.How many particles are there in 5.68 moles of carbon?
Date: _________________Objectives: 1) SWBAT convert between moles, mass, and molecules using molar mass and Avogadro’s Number.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 25
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Name: _________________________________________________ Date: __________________ Period: _____
Class NotesConversion Between Mass, Moles, and Particles
Example#1
How many grams are there in 4.5 x 1023 molecules of KCl?
Example#2
How many molecules are there in 88 grams of carbon dioxide?
Practice Samples
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein
Mass (grams)
# Particles # of Moles
Avogadro’s # Molar mass
Mass
Mass (grams)
# Particles # of Moles
Avogadro’s # Molar mass
Mass
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Name: _________________________________________________ Date: __________________ Period: _____
You may try Sample A with a partner if you still do not feel comfortable. Complete Samples B and C INDEPENDENTLY. SHOW ALL YOUR WORK.
Practice Sample A
Convert 35 grams of CO2 to molecules.
Practice Sample B
How many grams of water are there in 3.5 x 1023 molecules?
Practice Sample C
Express 4.23 x 1018 molecules of Flourine in grams.
Once you are finished, have Mr. Gutierrez check your work before continuing to the next question.
Date: _________________Objectives: 1) SWBAT convert between moles, mass, and molecules using molar mass and Avogadro’s Number.
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein
Mass (grams)
# Particles # of Moles
Avogadro’s # Molar mass
Mass
27
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Name: _________________________________________________ Date: __________________ Period: _____
CLASS WORKConversions – Moles, Mass, Particles
Class Work (Independent Practice) Directions: Finish as many questions as you can during class. Refer to your notes and ask at least three classmates before asking me for help. If you do not finish these questions in class, you must finish them for homework.
Convert. SHOW ALL YOUR WORK. You will not receive credit if you do not show your work.
1. How many grams are there in 9.5 x 1020 molecules of NaHCO3 ?
2. How many molecules are there in 40 grams of Na2CO3 ?
3.How many grams are there in 5.3 x 1020 molecules of CuSO4 ?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 28
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Name: _________________________________________________ Date: __________________ Period: _____
4.How many particles are there in 80 grams of Mg(OH)2 ?
5.How many grams are there in 3.5 x 1020 particles of Ba(NO3)2
6. What is the mass of 5 x 1050 molecules of lithium fluoride?
7. What is the mass of 500 particles of Phosphorus?
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 29
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Name: _________________________________________________ Date: __________________ Period: _____
8. How many molecules are there in 5.3 x 104 grams of potassium chlorate?
9. Convert 5.673 x 1012 molecules of oxygen to KILOGRAMS.
10. Convert 9.35 x 103 molecules of water to grams.
11. How many particles are there in 57.35 grams of carbon?
Make sure Mr. Gutierrez stamps/signs this by the end of the period. You CANNOT get the stamp/signature for a day later on. It is your responsibility to remind Mr. Gutierrez. You will NOT receive a stamp if you did not follow all classroom policies or actively work on the
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 30
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Name: _________________________________________________ Date: __________________ Period: _____practice problems during the allotted class time. A stamp means you received all 10 points. No stamps means you’ve received zero points. If you completed some work, I may give you partial credit based on my discretion. If you are absent, write the date on the day you were absent and write the word “Absent.” DO NOT LOSE THIS SHEET!!! (If you lose this sheet, you will lose all of your participation points. NO EXCEPTIONS.)
Day of Week Followed All Classroom Policies (Respectful, on time, prepared, engaged…)
Class work Participation Homework
Monday /10 /10 /10
Tuesday /10 /10 /10
Wednesday /10 /10 /10
Thursday /10 /10 /10
Friday /10 /10 /10
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 31
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Name: _________________________________________________ Date: __________________ Period: _____
Classroom Policy Violation Codes
P = PhoneC = CursingT = TalkingL = Late to classO.T. = Off Task
H.D. = Head DownN.iP = Did not bring iPadUnp = Unprepared (no pencil, no iPad, no emergency passes, no periodic table, etc.)
Teacher Comments:
"It's not that I'm so smart, it's just that I stay with problems longer." –Albert Einstein 32