Moles are a Chemist Best Friend Chapter 10
Moles are a Chemist Best Friend Chapter 10 nclark. net
Moles are a Chemist Best Friend Chapter 10 nclark. net
Objectives: Moles are a Chemist Best Friend • I can identify what a mole is in chemistry. • I can convert between representative particles of matter and moles. • I can convert between the mass of matter and moles. • I can convert between the volume of matter and moles.
Mole Bell Ringer 1. What are three ways we measure matter? 2. What is a mole in chemistry? 3. What are examples of representative particles in chemistry? 4. What is the conversion between representative particles and moles?
Measuring Matter What are three ways we can measure matter? 1. mass 2. quantity 3. volume hermitwoods. com
Measuring Apples www. google. com/url? sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja& stockphotos. it flickr. com
Grouping Matter • Easy way to measure all matter. r 1 Gross of pencils=155 Dozen dougnuts=12 Ream of paper =500 Byte of stored information=4
Grouping Representative Particles • How would we group representative particles of matter? Representative particles: substances that make-up matter. nclark. net
Classification of Matter
Grouping Representative Paraticles • How would we group representative particles that make-up matter? Representative particles: substances that make-up matter. (atoms, molecules or ionic compounds) nclark. net
Grouping Representative Particles A mole is a unit of measurement that is used to group representative particles. 1 mole = 6. 02 x 1023 representative particles (Avogadro’s Number) • “The Mole is a Unit” (nclark. net)
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Converting Moles to Representative Particles Ex. Propane (C 3 H 8) is a gas used for cooking and heating. How many molecules of propane is equal to 2. 4 moles of propane?
Conversion: Representative Particles to Moles Ex. Magnesium is a light metal used in the manufacture of aircraft and automobile wheels. How many moles of magnesium equals 1. 25 x 1023 atoms of magnesium?
Measuring Matter What are three ways we can measure matter? 1. 2. 3. hermitwoods. com
Grouping Matter • Easy way to measure all matter. r Gross of pencils= Dozen dougnuts= Ream of paper = Byte of stored information=
Mole Map
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Pre-AP Chemistry(3/28) Objectives: • Convert between moles and representative particles of a substance. • Convert between moles and mass of a substance. Homework: Law of Conservation of Mass-Final Draft Typed Mole Problems Have a fun and safe spring break.
Bell Ringer: Moles 1. Define and give two examples of a representative particle. 2. a. What is a mole? b. How many atoms are in a mole of Cu? 3. How many moles are in 4. 65 x 1024 molecules of CO 2 ?
Conversions: Mole-Representative Particles (Homework Problems Key) 1. 2. 3. 4. 5. 1. 2 x 1024 molecules 9. 0 x 1023 molecules 4. 5 x 1023 molecules 9. 0 x 1024 molecules 2. 1 x 1023 molecules 1. 00 moles 2. 5 x 10 -4 moles 5. 6 x 102 moles 1. 2 x 10 -4 moles (2 sig. Figs) (2 sig figs) (3 sig figs) (2 sig figs)
Conversion: Mole-Representative Particles Homework Problems
Converting Moles to Mass • How do we convert from moles to mass of a substance?
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Converting Moles to Mass • How do we convert from moles to mass?
Mole Conversions: 4. 24 Objectives: • I can identify what a mole is in chemistry. • I can convert between representative particles of matter and moles. • I can convert between the mass of matter and moles.
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Conversion: Moles- Mass • Mole-Mass Conversion: 1 mole of a substance = molar mass of the substance • Molar mass = substance’s atomic mass in grams Examples: • A mole of sodium has a molar mass of? • A mole of H 2 O has a molar mass of?
Molar Mass of an Element • Molar mass = element’s atomic mass(grams) • Round atomic mass to tenths place. Ex. A mole of sulfur has a molar mass of? Ex. A mole of sodium has a molar mass of?
Molar Mass of a Compound • Molar mass = sum of the elements’ atomic masses in the compound • Need chemical formula to calculate the molar mass of a compound. Ex. A mole of Na. Cl has a molar mass of? Ex. A mole of H 2 O has a molar mass of?
Mole Conversions: 4. 25 Objectives: • I can identify what a mole is in chemistry. • I can convert between representative particles of matter and moles. • I can convert between the mass of matter and moles.
Bell Ringer: Chemistry 1. Classify each substance below with the correct representative particle. (atom, ionic compound, or molecule) a. Na 2 O b. Fe c. H 2 d. Ne 2. How many atoms of Cu are in 2. 5 moles of copper? 3. What is the molar mass of Al 2(CO 3)3? 4. How many grams of Al 2(CO 3)3 are in 3. 25 moles of Al 2(CO 3)3?
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Bell Ringer: Chemistry 1. Classify each substance below with the correct representative particle. (atom, ionic compound, or molecule) a. Na 2 O b. Fe c. H 2 d. Ne 2. How many atoms of Cu are in 2. 5 moles of copper?
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Bell Ringer: Chemistry 3. What is the molar mass of Al 2(CO 3)3? 4. How many grams of Al 2(CO 3)3 are in 3. 25 moles of Al 2(CO 3)3?
Mole Conversions: 2 -Step Conversions http: //mysite. cherokee. k 12. ga. us
Mole Conversions:
Mole Conversion Map http: //mysite. cherokee. k 12. ga. us
Mole Conversions: 4. 28 Objectives: • I can identify what a mole is in chemistry. • I can convert between representative particles and mass by using the mole. Homework: • Mole conversion quiz tomorrow. • Mole Conversions: 2 -step problems (last page)
Fun with Moles Review • Review mole conversions http: //mysite. cherokee. k 12. ga. us
Mole Conversions: 4. 29 Infinite Campus Update: • Fun With Moles Wksht-Due asap (14 pts. ) • Chemical Reactions Test updated (30 pts. ) Objectives: • I can convert between representative particles and mass by using the mole. • Mole Quiz • I can calculate % composition of compound Homework: • % Composition Worksheet
Mole Conversions: 2 -Step Conversions http: //mysite. cherokee. k 12. ga. us
Mole Conversions: 4. 30 Infinite Campus Update: • Mole Quiz Objectives: • Review Mole Quiz • I can calculate % composition of compound Homework: • % Composition Worksheet
Calculate % Composition of Compound Ex. What is the % composition of the following compound, Al(NO 2)3 ?
% Composition as a Conversion Factor • Use % composition data to calculate the mass of an element from a known sample size. • Ex. What is the mass of Al in 6. 5 g of Al(NO 2)3 ?
Percentage Composition of a Compound What is Percentage Composition of a Compound?
% Composition from Chemical Formula % mass of element = Ex. Propane, C 3 H 8 is one of the compounds obtained from petroleum and is used to fuel homes and gas grills. Calculate the percent composition of propane.
Mole Conversions: 5. 1 Due: % Composition of Compounds Wksht. Objectives: • Address questions over homework. • I can calculate % composition of sugar in dubble bubble gum. • Review Chemical Quantities Study Guide Homework: • Work on Chemical Quantities Study Guide • Mole Conversion Quiz • Chemical Quantities Exam-Monday
% Composition of Compounds Wksht.
Bubble Gum Lab • Purpose: Calculate the % composition of sugar in dubble bubble gum.
Mole Conversions: 5. 2 Due: Bubble Gum Lab (10 pts. ) Objectives: • Mole Conversion Quiz-Retake • Address results from Bubble Gum Lab • Review Chemical Quantities Study Guide Homework: • Work on Chemical Quantities Study Guide • Chemical Quantities Exam-Monday
Bubble Gum Lab • Purpose: Calculate the % composition of sugar in dubble bubble gum. • Actual percent sugar in dubble bubble gum:
Chemical Quantities Study Guide
Hydrate Lab • Hydrated Salt: Cu(SO 4) . • Anhydrous Salt: Cu(SO 4) H 2 O
Mole Conversion Lab -What conversions did we use in this lab?
Mole Conversion Lab Salt Before: mass of salt shaker ______ mass of salt shaker + salt______ mass of salt ______ Salt After: ______
Mole Conversion Lab Chalk Conversions: mass of chalk: ______
Mole Conversions • Convert 6. 5 x 1025 cmpds. of Mn. Cl 3 to moles of Mn. Cl 3 a. What conversion is needed? a. Write down known(given) and multiply by conversion fraction.
Mole Conversions • Convert 1. 75 moles of H 2 SO 4 to grams of H 2 SO 4 a. What conversion is needed? b. Write down known(given) and multiply by conversion fraction.
Chemical Quantities • I can recognize that the mole is a standard unit of measurement for small particles. • I can convert between the number of particles in a substance(atoms or compounds) to the number of moles in a substance. • I can convert between the mass of a substance and the number of moles in a substance. • I can calculate the percent composition of a compound and use it as a conversion factor. • I can distinguish the difference between empirical and molecular formulas.
% Composition from Mass Data % mass of element = Ex. When a 13. 6 g sample of a compound containing only magnesium and oxygen is decomposed, 5. 4 g of oxygen is obtained. What is the percent composition each element in the compound?
% Composition as a Conversion Factor • What is the mass of Al in 6. 5 g of Al(NO 2)3 ?
% Composition as a Conversion Factor • What is the mass of N in 6. 5 g of Al(NO 2)3 ? • What is the mass of O in 6. 5 g of Al(NO 2)3?
Bell Ringer: Chemical Quantities 1. How many grams are in 5. 0 moles of Cs 3 N ? 2. How many moles are in 3. 7 x 1021 cmpds. of Na. Cl? 3. What is the % composition of Cu 2(SO 4)? 4. How many grams of Cu are in 9. 8 g of Cu 2(SO 4)?
Empirical vs. Molecular Formulas Chemical Name CH C 2 H 2 (acetylene) C 6 H 6 (benzene) CH 2 O (methanol) C 2 H 4 O 2 (ethanoic acid) C 6 H 12 O 6 (glucose) Formula Classification
Cu(SO 4) . Hydrate Lab H 2 O ----> Cu(SO 4) + H 2 O Use the equation above to help answer the following questions: 1. What is the hydrate salt in this equation? 2. What is the anhydrous salt in this equation? 3. What is the difference between a hydrated salt and an anhydrous salt? 4. Is this a physical or chemical reaction? 5. What did you calculate the chemical formula for the hydrated salt to be?
Copper Sulfate Hydrate
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