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Elizabeth Sanderford 1407-510 Scientific Notation and Unit Prefixes Make the following conversions: 1) 3.4 liters to milliliters 3.4 x 1000 3,400 mL x100 4,500cm 2) 876 millimeters to meters 876/1000 .876 m 0117kg 3) 78,999 milligrams to grams /1000 78.999g 9L 4) 0.9 centigrams to grams /100 .009grams 44m 5) 112 meters to millimeters x1000 112,000mm x1000 = 277,000grams

6) 7)

11.7 grams to kilograms/1000 .

8)

0.0009 kiloliters to liters x1000 .

9)

44 centimeters to meters 44/100 . 10)

Convert the following to scientific notation: 11) 45,700 _______4.57x104____________________ 12) 0.009 __9.0x10-3_______________________ 13) 23 _____2.3x10_________________________ 14) 0.9 _______9.0x10-1_______________________ 15) 24,212,000 ___2.42 x 107_______________________ 16) 0.000665 _______6.7x10-4_______________________ Convert the following to scientific notation: 17) 21.9 ______2.19 x 101________________________ 18) 0.00332 ______3.32 x 10-3________________________ 19) 321 _______3.21 x 102_______________________ 20) 0.119 ______1.19 x 10-1________________________ 21) 1492 ______1.492 x 103________________________ 22) 0.2713 _______2.713 x 10 -1_______________________ 23) 314159 _____3.14159 x 105_________________________ 24) 6022 _____6.022 x 103_________________________ 25) 0.12011 ________1.2011x 10-1______________________ Convert the following numbers in scientific notation to expanded form: 26) 3.825 x 103 ___________3825___________________ 27) 6.3 x 104 _____63,000____________________ 28) 2.3 x 10-2 _______.023______________________ 29) 4.44 x 10-6 ________.00000444____________________ 30) 7.121 x 109 _____7121,000,000__________________ 31) 1.2 x 10-1 _______.12_______________________ 32) 1.8 x 102 ________180______________________ 33) 8.1 x 10-4 ______.00081________________________ 34) 6.7 x 105 ________670,000______________________ 35) 3.4 x 107 _______34,000,000_______________________

Unit Conversions Practice 1) 2)

Convert 16.7 inches to feet 1.39 ft Convert 25 yards to feet (there are 3 feet in a yard) x3= 75 ft 1

45 meters to centimeters

277 kilograms to grams

3) 4) 5) 6) 7) 8) 9) 10) 11)

Convert 90 centuries to years x100= 9000 Convert 84 miles to kilometers (there are 0.6 miles in a kilometer) 135.18 km Convert 4.75 centimeters to meters .0475 m Convert 48,987 minutes to days 34.02 days Convert 27 months to fortnights (there are 14 days in a fortnight and ~30 days in a month) 58.66 fortnights Convert 0.09 miles to inches (there are 36 inches in a yard and 1760 yards in a mile) 5702.4 in Convert 4.66 centimeters to miles (there are 0.6 miles in a kilometer) 2.9 x10 -5 miles Convert 556 degrees Celsius to Kelvins 829.15K Convert 25 Kelvins to degrees Celsius -248.15℃

Moles Worksheet 1) 2) 3) 4) 5) 6) 7)

8)

Define “mole”. a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. How many moles are present in 34 grams of Cu(OH)2? .35 moles How many moles are present in 2.45 x 10 23 molecules of CH4? .41 moles How many grams are there in 3.4 x 1024 molecules of NH3? 96 grams What is the mass of 4.2 moles of Ca(NO3)2? 689 grams What is the molar mass of MgO? 40.3044 g How are the terms “molar mass” and “atomic mass” different from one another? Molar mass” is used to d escribe the mass of one mole of a chemical compound, while “atomic mass” is used to describe the mass of one mole of an element or the mass of one atom of an element Which is a better unit for expressing molar mass, “amu” or “grams/mole”? “Grams/mole” is better, because any macroscopic amount of a substance is better expressed in grams

Molar Mass Worksheet Calculate the molar masses of the following chemicals: 1)

Cl2 35.45(2)=70.90g/mol BeCl2 79.9182 g/mol 4) FeCl3 162.2 g/mol 120.92 g/mol 7) Mg(OH)2 58.3197 g/mol 64.066 g/mol 10) H3PO4 97.994 g/mol 13) Pb(NO3)2 331.2 g/mol

2) 5)

11) 14)

KOH 56.1056 g/mol

3)

BF3 67.82 g/mol

6)

CCl2F2

8)

9)

SO2

UF6

352.02 g/mol

(NH4)2SO4 132.06 g/mol 12) Ga2(SO3)3 379.6356 g/mol

CH3COOH 60.0 g/mol

Grams/Moles Calculations Given the following, find the number of moles: 1) 30 grams of H3PO4 .04 moles 3) 110 grams of NaHCO3 1.31 moles 5) 987 grams of Ra(OH)2 3.80 moles 7) 12.3 grams of CO2 .28 moles

2) 4) 6) 8)

25 grams of HF 1.25 moles 1.1 grams of FeCl3 .0068 moles 564 grams of copper .11 moles 89 grams of Pb(CH3COO)4 .2008 moles

Given the following, find the number of grams: 9) 4 moles of Cu(CN)2 115.5808 grams. 11) 21.3 moles of BaCO3 4202.5 grams 13) 9.3 x 10-3 moles of SmO 1.5 grams

12) 14)

10) 5.6 moles of C6H6 436.8 grams 1.2 moles of (NH4)3PO3 159.6 grams 6.6 moles of ZnO 537.2 grams

2

15)

5.4 moles of K2SO4

941.2 grams

16)

88.4 moles of NI3 34679.3 grams

Mole Calculation Worksheet 1) 2) 3) 4) 5) 6) 7) 8)

How many moles are in 15 grams of lithium? 15 grams x 1 mole = 2.14 moles How many grams are in 2.4 moles of sulfur? 2.4 moles x 32 grams = 76.8 grams How many moles are in 22 grams of argon? 22/40 = .55 moles How many grams are in 88.1 moles of magnesium? 88.1 moles Mg × 24.3 grams = 2140.83 moles Mg How many moles are in 2.3 grams of phosphorus? 30.97 / 2.3 g = 0.074 moles How many grams are in 11.9 moles of chromium? 11.9 x 52 = 618.8 grams How many moles are in 9.8 grams of calcium? .24 moles How many grams are in 238 moles of arsenic? 17,8226 grams

What are the molecular weights of the following compounds? 9) NaOH 40.1grams 12) H3PO4 98.0grams 10) H2O 18.0 grams 13) Mn2Se7 663.0 grams 11) MgCl2 95.3 grams 14) (NH4)2SO4 132.1 grams 15) How many grams are in 4.5 moles of sodium fluoride, NaF? 189 grams 16) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3? 1.26 moles 17) How many grams are in 0.02 moles of beryllium iodide, BeI2? 5.2 grams 18) How many moles are in 68 grams of copper (II) hydroxide, Cu(OH)2? .70 moles 19) How many grams are in 3.3 moles of potassium sulfide, K2S? 364.0 grams 20) How many moles are in 1.2 x 103 grams of ammonia, NH3? 70.6 moles 21) How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca3(PO3)2? .064 grams 22) How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO2? 5.66 x 10-9 moles 23) How many grams are in 1.11 moles of manganese sulfate, Mn 3(SO4)7? 167.0 grams

Moles, Molecules, and Grams Worksheet 1) 2) 3) 4) 5) 6) 7) 8) 9)

How many molecules are there in 24 grams of FeF3? 1.3 x 1023 molecules How many molecules are there in 450 grams of Na 2SO4? 1.9 x 10 24 molecules How many grams are there in 2.3 x 1024 atoms of silver? 410 gAg How many grams are there in 7.4 x 1023 molecules of AgNO3? 210 g AgNO3 How many grams are there in 7.5 x 1023 molecules of H2SO4? 120g H2SO4 How many molecules are there in 122 grams of Cu(NO3)2? 3.92 x 1023 How many grams are there in 9.4 x 1025 molecules of H2? 320 g H2 How many molecules are there in 230 grams of CoCl 2? 1.1 x 1024 How many molecules are there in 2.3 grams of NH 4SO2? 1.7 x 1022 3

10) 11) 12) 13) 14) 15) 16)

How many grams are there in 3.3 x 1023 molecules of N2I6? 430 g N2I6 How many molecules are there in 200 grams of CCl 4? 8 x1023 How many grams are there in 1 x 1024 molecules of BCl3? 200g BCl3 How many grams are there in 4.5 x 1022 molecules of Ba(NO2)2? 17g Ba(NO2)2 How many molecules are there in 9.34 grams of LiCl? 1.33 x 10 23 How many grams do 4.3 x 1021 molecules of UF6 weigh? 2.5 g UF6 How many molecules are there in 230 grams of NH 4OH? 3.9 x 1024

Mole Problem Using your knowledge of mole calculations and unit conversions, determine how many atoms there are in 1 gallon of gasoline. There are 3.785 L in one gallon. Assume that the molecular formula for gasoline is C6H14 and that the density of gasoline is approximately 0.85 grams/mL. There are _____2.690 x 1025_______________ atoms in 1 gallon of gasoline.

1gal(3.785L/1gal)(1000ml/1L) (.85g/1ml)(1mol/72g) (6.022 x 10^23 atoms/1mol) = 2.690 x 1025

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