chapters 1-3 lesson 6 topics physical vs chemical physical vs chemical extensive vs intensive...

Chapters 1-3 Lesson 6Chapters 1-3 Lesson 6

TopicsTopics

Physical vs chemicalPhysical vs chemical Extensive vs IntensiveExtensive vs Intensive Units of measureUnits of measure Dimensional analysis and significant Dimensional analysis and significant

figuresfigures


Problems 2.115 & 2.116Problems 2.115 & 2.116

Classify each of the following as a Classify each of the following as a compound, a homogeneous mixture, compound, a homogeneous mixture, or a heterogeneous mixtureor a heterogeneous mixture

Distilled waterDistilled water orange juiceorange juice

GasolineGasoline vegetable soupvegetable soup

Beach sandBeach sand cementcement

WineWine calcium sulfatecalcium sulfate

AirAir teatea


Problems 2.115 & 2.116Problems 2.115 & 2.116

homogeneous mixturehomogeneous mixture

Gasoline Gasoline WineWine

Air Air TeaTea heterogeneous mixture heterogeneous mixture

Beach sandBeach sand orange juiceorange juice

cement cement vegetable soupvegetable soup compound compound

Distilled water Distilled water calcium sulfatecalcium sulfate


1-801-80

Carry out the following calculation, Carry out the following calculation, and report the answer with the and report the answer with the correct number of significant figures.correct number of significant figures.

(1.68) (1.68) 23.56 – 2.323.56 – 2.3

1.248 X 101.248 X 1033


Chemical Problem Solving: A Systematic Approach to Solving

Chemistry Problems

What is the price of 325 cm of wire if the wire costs $0.15/ft?

2.54 cm = 1.0 in 12.0 in = 1.0 ft



Chemistry Problems

Price of 325 cm of wire @ $0.15/ft?2.54 cm = 1.0 in & 12.0 in = 1.0 ft

325 cm 1.0 in 1.0 ft $0.15 -------- ------ ------ = $1.60 2.54 cm 12.0 in 1.0 ft


Measurement in Scientific Study: Some Important SI Units in

ChemistryPROBLEM 1.3

If you submerge a steel cube 15.0 mm on each side in 31.8 mL of water in a graduated cylinder, what is the total volume (in L) of the cylinder contents?

31.8 mL31.8 mL




If a raindrop weighs 65 mg on average and 5.1 x 105 raindrops fall on a lawn every minute, what mass (in kg) of rain falls in 1.5 h?




The piece of galena in Sample Problem 1.3 has a volume of 4.6 cm3. If the density of galena is 7.5 g/cm3, what is the mass (in kg) of that piece of galena?


Uncertainty in Measurement: Significant Figures: Determining Which Digits Are

Significant

PROBLEM 1.7For each of the following quantities, underline the zeros that are significant figures and determine the number of significant figures (sf) in each quantity. For (d) to (f), express each in exponential notation first.– (a) 31.070 mg (d) 200.0 mL– (b) 0.06060 g (e) 0.0000039 m– (c) 850. oC (f) 0.000401 L


Problem 2.18Problem 2.18

Fluorite, a mineral of calcium, is a Fluorite, a mineral of calcium, is a compound of the metal with fluorine. compound of the metal with fluorine. Analysis shows that a 2.76-g sample Analysis shows that a 2.76-g sample of fluorite contains 1.42-g of calcium. of fluorite contains 1.42-g of calcium. Calculate the (a) mass of fluorine in Calculate the (a) mass of fluorine in the sample; (b) mass fractions of the sample; (b) mass fractions of calcium and fluorine in fluorite; (c) calcium and fluorine in fluorite; (c) mass percents of calcium and mass percents of calcium and fluorine in fluorite.fluorine in fluorite.


MTS 2MTS 2

Write the notation for Write the notation for each atomic depiction.each atomic depiction.

47 p+

62 n0

47 p+

62 n0

47 e-47 e-

28 e-

28 p+

33 n0

28 e-

28 p+

33 n0


MTS 3MTS 3 Calculating an atomic mass from Calculating an atomic mass from

isotopic compositionisotopic composition (SP2.3) (SP2.3) Magnesium has three naturally Magnesium has three naturally

occurring isotopes, occurring isotopes, 2424Mg (isotopic Mg (isotopic mass 23.9850 amu, abundance mass 23.9850 amu, abundance 78.99%), 78.99%), 2525 Mg (isotopic mass Mg (isotopic mass 24.9858 amu, abundance 10.00%), 24.9858 amu, abundance 10.00%), and and 2626Mg (isotopic mass 25.9826 Mg (isotopic mass 25.9826 amu, abundance 11.01%). Calculate amu, abundance 11.01%). Calculate the atomic mass of magnesium. (EOT the atomic mass of magnesium. (EOT 2.46)2.46)


MTS 3MTS 3

Calculating an atomic mass from Calculating an atomic mass from isotopic composition (SP2.3)isotopic composition (SP2.3)

Copper has two naturally occurring Copper has two naturally occurring isotopes, isotopes, 6363Cu (isotopic mass Cu (isotopic mass 62.9396 amu) and 62.9396 amu) and 6565Cu (isotopic Cu (isotopic mass 64.9278 amu). If copper as mass 64.9278 amu). If copper as an atomic mass of 63.546 amu, an atomic mass of 63.546 amu, what is the percent abundance of what is the percent abundance of each isotope? (EOT 2.48)each isotope? (EOT 2.48)


Problem 4Problem 4

A flask has a mass of 78.23 g when empty and 593.63 g A flask has a mass of 78.23 g when empty and 593.63 g whenwhen

filled with water. When the same flask is filled withfilled with water. When the same flask is filled withconcentrated sulfuric acid, H2SO4, its mass is 1026.57 g. concentrated sulfuric acid, H2SO4, its mass is 1026.57 g.

What is the density of concentrated sulfuric acid? The What is the density of concentrated sulfuric acid? The

density density of water at 25 of water at 25 ooC is 0.99707 g/cm3.C is 0.99707 g/cm3.

Mass Mass H2OH2O = 593.63 g – 78.23 g = 515.4 = 593.63 g – 78.23 g = 515.400 g gVolume Volume H2OH2O = m/D = 516.9 = m/D = 516.91146 cm46 cm33

Mass Mass H2SO4H2SO4 = 1026.57 g – 78.23 g = 948.3 = 1026.57 g – 78.23 g = 948.344 g gD D H2SO4 H2SO4 = m/V = 1.834= m/V = 1.8346616 g/cm16 g/cm33 = = 1.8346 g/cm1.8346 g/cm33


Problem 6Problem 6

Hoffmannium has three common isotopes: Hoffmannium has three common isotopes: 336336Hm,Hm,

338338Hm, and Hm, and 340340Hm. If the abundance of Hm. If the abundance of 340340Hm Hm

is 5.023 %, what are the abundances of is 5.023 %, what are the abundances of 336336Hm Hm

and and 338338Hm? The mass ofHm? The mass of 336 336Hm is 335.99452Hm is 335.99452

amu, amu, 338338Hm is 337.98638 amu, and Hm is 337.98638 amu, and 340340Hm isHm is

339.97481 amu. The mass of naturally 339.97481 amu. The mass of naturally occurringoccurring

hoffmannium is 336.8751 amu.hoffmannium is 336.8751 amu.

60.8% = 60.8% = 336336HmHm 34.2% = 34.2% = 338338HmHm


Problem 3Problem 3

The average density of the Earth The average density of the Earth isis

5.52 g/cm5.52 g/cm33. What is the density . What is the density inin

lb/ftlb/ft33??

345 lb/ft345 lb/ft33



Chemistry Problems

A furniture factory needs 31.5 ft2 of fabric to upholster one chair. Its Dutch supplier sends the fabric in bolts of exactly 200 m2. What is the maximum number of chairs that can be upholstered by 3 bolts of fabric (1 m = 3.281 ft)?




Mercury melts at 234 K, lower than any other pure metal. What is its melting point in oC and oF?

T (K) = T (oC) + 273.15T (oC) = T (K) – 273.15 T (oF) = 9/5 T (oC) + 32 = 1.8 T (oC) + 32

T (K) = T (oC) + 273.15T (oC) = T (K) – 273.15 T (oF) = 9/5 T (oC) + 32 = 1.8 T (oC) + 32

chapters 1-3 lesson 6 topics physical vs chemical physical vs chemical extensive vs intensive...

Documents