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 moles and representative particles of substances. I can convert between moles and mass of substances. I can calculate the percentage composition of substances.

Measuring Matter What are three ways we can measure matter? 1. 2. 3. hermitwoods.com

Measuring Apples rainycity.com stockphotos.it flickr.com

Grouping Matter Easy way to measure all matter. r500 Gross of pencils= 144 Dozen dougnuts= 12 Ream of paper = 500 Byte of information storage= 4 bits

Grouping Matter How do scientists’ group the representative particles that make-up matter? Representative particles: substances that make-up matter. Examples: Atoms Ionic Compounds Molecules (covalent cmpds.) nclark.net

Classification of Matter 7

Grouping Representative Particles A mole is used to group representative particles. 1 mole = 6.02x1023 representative particles (Avogadro’s Number) “The Mole is a Unit Song” (nclark.net)

Mole Map

Converting Moles to Representative Particles Ex. Propane (C3H8) is a gas used for cooking and heating. How many molecules of propane is equal to 2.4 moles of propane?

Convesion: 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 1.25x1023 atoms of magnesium?

Mole Map

Bell Ringer: Moles Define and give two examples of a representative particle. a. What is a mole? b. How many atoms are in a mole of Cu? How many moles are in 4.65x1024 molecules of CO2 ?

Conversions: Mole-Representative Particles (Homework Problems Key) 1.2x1024 molecules (2sig. Figs) 9.0x1023 molecules (2 sig figs) 4.5x1023 molecules (2 sig figs) 9.0x1024 molecules (2 sig figs) 2.1x1023 molecules (2 sig figs) 1. 1.00 moles (3 sig figs) 2.00 moles (3 sig figs) 2.5x10-4 moles (2 sig figs) 5.6x102 moles (2 sig figs) 1.2x10-4 moles (2 sig figs)

Conversion: Mole-Representative Particles Homework Problems

Converting Moles to Mass How do we convert from moles to mass?

Objectives: Moles are a Chemist Best Friend I can identify what a mole is in chemistry. I can convert between moles and representative particles of substances. I can convert between moles and mass of substances. I can calculate the percentage composition of substances.

Mole-Mass Conversion

Mole Map

Converting Moles to Mass How do we convert from the moles of a substance to the mass of a substance?

Conversion: Moles- Mass Mole-Mass Conversion: 1 mole of a substance = molar mass of the substance Molar mass = substance’s atomic mass in grams

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 NaCl has a molar mass of? Ex. A mole of H2O has a molar mass of?

Bell Ringer: Chemistry What is the representative particle for each substance below? (atom, ionic compound, or molecule) a. Na2O b. Fe c. H2 d. Ne How many atoms are in 2.5 moles of copper? a. What is the molar mass of silver, Ag? b. What is the molar mass of Al2(CO3)3?

Mole Packet Questions

Mole-Mass Conversions 1 mole = molar mass of substance Ex. When iron is exposed to air, it corrodes to form red-brown rust. How many moles of iron (III) oxide are contained in 92.2g of pure Fe2O3?

Mole Map

Mole-Mass Conversions Ex. What is the mass of 9.45 moles of aluminum oxide? (1 mole = molar mass of a substance)

Mole Map

Mole Conversions Mole to Particle Conversion: 1 mole = 6.02x1023 particles (atoms or cmpds) Mole to Mass Conversion: 1 mole = molar mass of the substance (grams)

Mole Map

Bubble Gum Lab Purpose: Practice mole conversions and calculate the % composition of sugar in bubble gum.

Mole Map

Chemical Quantities Objectives (Chpt.10) I can identify what a mole is in chemistry. I can convert between moles and representative particles of substances. I can convert between moles and mass of substances. I can calculate the percentage composition of substances.

Bell Ringer: Mole Conversions Define “mole”. Name the representative particle of each substance. (atom, molecule, ionic compound) oxygen gas b. sodium sulfide potassium d. sulfur dioxide What is the molar mass of a substance? What is the conversion needed for each problem below? mole to representative particle conversion? mole to mass conversion?

Chemical Quantities Quiz Questions

Fun with Moles Review Purpose: Work together in groups to competitively review mole conversion calculations learned before spring break.

Moles Conversion Review Worksheet 1.8x1024 atoms a. 40.3g b. 74g c. 78g d.96 g 0.0417 mole AgCl 0.35 mole Cu(OH)2 0.258 mol SiO2 51 gH2O2 120 g 1,040 g C5H12 52.7 g Cu

Mole Map

Mole Conversions: 2 step problems How many molecules are there in 100 grams of CCl4 ? 2. How many grams do 1.2x1021 molecules of BCl3 weigh?

Mole Conversions: 2 step Problems

Mole Conversion Lab Problem: How many molecules are present in a tablespoon of the following substances? sodium chloride water calcium carbonate Design and conduct an experiment that will help you solve this problem. Make sure to include a hypothesis, data section, and conclusion.

Mole Conversion Lab Questions

Mole Map

Percentage Composition of a Compound Percent of mass each element contributes to the compound’s molar mass. How do we calculate % composition of a compound?

% Composition from Chemical Formula % mass of element = Ex. Propane, C3H8 is one of the compounds obtained from petroleum and is used to fuel homes and gas grills. Calculate the percent composition of propane.

% Composition of Compound 1. What is the % composition of each element in the following compound, Al(NO2)3 ? 2. What is the mass of Al in 6.5 g of Al(NO2)3 ? (Hint: use % composition data to solve problem)

Mole Conversions: 2 step Problems

Bell Ringer: Chemical Quantities 1. If a sample contains 2.34x1023 atoms of mercury, how much does it weigh in grams?

% Composition as a Conversion Factor

% Composition as a Conversion Factor What is the mass of Al in 6.5 g of Al(NO2)3 ?

% Composition as a Conversion Factor What is the mass of N in 6.5 g of Al(NO2)3 ? What is the mass of O in 6.5 g of Al(NO2)3?

Bell Ringer: Chemical Quantities How many grams are in 5.0 moles of Cs3N ? 2.How many moles are in 3.7x1021 cmpds. of NaCl? What is the % composition of Cu2(SO4)? 4. How many grams of Cu are in 9.8 g of Cu2(SO4)?

Infinite Campus Update Mole Conversion Lab 10pts. Chemical Reaction Lab Rough Draft 20pts.

Formal Lab Reports: Final Copy Computer Lab Days Periods Wed. (4/25) Thurs. (4/26) Fri. (4/27) Mon. (4/30) 1st Library 2nd 3rd Rm 323 4th 6th 7th

Hydrate Lab

Hydrate Lab Hydrate: Cu(SO4) . H2O Anhydrous salt: Cu(SO4)

Mole Map

Objectives Chemical Quantities Test today. Hydrate Lab tomorrow-read procedures Bring Chemistry Textbook tomorrow

Chemical Quantities Test Choose one of the molar mass problems to calculate. Test A and B qts10. calculate % composition of C16H18N2O4S; omit qts. 12. Test C and D: qts 10 caculate % composition of Fe(CH3O2)2; omit qts. 11