Chapter 1 HW Solutions

Ch 1.1 – 1.3 #2 A) solid B) gas C) liquid D) gas

#4 A) homogeneous mixture B) heterogeneous mixture C) pure substance D) mixture (hetero vs. homo can’t be

determined by visual inspection)

#8

A) Be B) Cs C) F

D) Mn E) As F) Xe G) PH) Sc

#10 A) Barium B) Californium C) Molybdenum D) Selenium E) Thallium F) Vanadium G) Gold H) Zirconium

#11 A is a compound – rationale CO2

produced B is probably compound because it is

a white solid

Ch1.4 – 1.6 #18a

right toplaces 10 decimal move places 10 12- - 2-

m10 is pm vsm 10 cmor

65pmm1X10

1pm

1cm

m1X10cm6.5X10

12-2-

12

29

18b

right toplaces 3 decimal move places 3 6- - 3-

m10 is L vsL 10 mLor

L335.L1X10

L1

1000mL

L1mL3.35X10

6-3-

64-

18 c, d, e

.125uss101

1uss1012.5 E)

.00423mmm)10(1

1mmm104.23 D)

mmol 2.5mol101

1mmolmol102.5 C)

6-8-

333-

3312-

33

18 f, g

6.54uss101

1us

1fs

s101fs106.54 G)

3.5kLL101

1kLL103.5 F)

6

159

33

#20

ms625.1s

ms1X10 X sX10 6.25 C)

nm2.3X10m1X10

1nmX

1mm

m1X10 X .0023mm B)

g2.52X101kg

1000gX kg2.52X10 A)

34-

39

3-

63

#24 Vol = length3;

density = mass/vol

sink it will sor than watedense more is ruthenium No,

12g/cm33.375cm3

42.0gdensity

3.375cm3(1.5cm)3vol

#27 Thickness=volume/area

thick46nmor

m4.6X101cm

m1X10X

2,230cm

.01035cmthickness

cm2.2X10in

cm2.54X

1ft

in122.4ftX1ftXarea

.0104cm19.32g

1cmX

1000mg

1g X 200mgvol

82

2

3

232

22

2

22

33

CH 1.7 – 1.9

#34 A) 4 B) 3 C) ambiguous 5,6, or 7 D) 6 E) 6

#36 A) 1.44 X 105

B) 9.75 X 102

C) 8.90 X 105

D) 6.76 X 104

E) 3.40 X 104

F) –6.56

#38 A) -2.3 X 103

B) 8.260 X 107

C) 3.4 X 104

D) 7.62 X 105

#41

1.55g/L1L

1dm

(10dm)

1m

1kg

1000g

m

kg1.55 D)

s106.881ns

m101ns106.88 C)

places 9 decimal moveor

50.nmm101

1nmm105.0 B)

places 3 decimal moveor

76mL1L

1000mLA).076L

3

3

3

3

4-9-

5

9-8-

#43 a-d

m/s105.0s101

1ms

1pm

m101

ms

5.0pm D)

$.410

1L

1.057qt

4qt

1gal

gal

$1.55 C)

s102.59min1

60

1hr

60min

1day

24hr3.00days B)

m101.381km

1000m

1mi

1.609km8.60mi A)

9-3-

12-

5

4

L

s

#43 e & f

363

3

3

33 cm101.567

1in

(2.54cm)

1ft

(12in)55.35ft F)

33.52m/s3600s

1hr

1km

1000m

1mi

1.609km

hr

75.00miE)

#45

g

26ml

453.6g

1lb

1L

1000mL

1.057qt

1L

4cups

1qt

1lb

50cups )

1

64.9

1L

1.057qt

4qt

1gal

1mi

1.609km

11.2gal

254mi C)

mg1042.205lb

1kg

kg

6mg150lb B)

L101.21.057qt

1L

1gal

4qt31gal A)

2

2

D

L

km

Chapter 2 HW Solutions

2.1 – 2.3 #2

A) 6.500 g compound - .384 g H = 6.116g S

B) Conservation of Mass

C) Atoms are not created or destroyed so if a compound has only H and S and .384 grams is H the rest must be sulfur

#4 integer ratio indicates combining F units that are

indivisible

659.

55.3

1

55.3

S 19.3g

F 68.6g

159.

59.

1

59.

S 16.6g

F 9.8g

459.

143.1

1

37.2

S 23.2g

F 55.0g

gS

gF

gS

gF

gS

gF

#5 Evidence that cathode rays were

negatively charged was the electric and magnetic field deflected the ray the same way it would a negative charge and that the negative plate exposed to the cathode rays acquired a negative charge.

#11

atoms4.2X102.4A

atom1Cr X

m10 X 1

1AX

cm 100

m 1 X cm 1.0

240pmm10 X 1

1pmX

1Α

m10 X 1 X2.4Α.

.24nmm10 X 1

1nmX

1Α

m10 X 1 X2.4Α.

710

12

10

9

10

#14 A) 32P has 15 p, 17n, 15 e B) 51Cr has 24p, 27n C) 60Co has 27 p, 33 n

Ch 2.4 – 2.5 #20 A) Lithium (metal) B) scandium (metal) C) germanium (Metalloid) D) ytterbium

(metal) E) manganese (metal) F) gold (metal) G) tellurium (metalloid)

#21 A) K, alkali metals (metal) B) I, halogens (nonmetal) C) Mg, alkaline earth metals (metal) D) Ar, noble gases (nonmetal) E) S, chalcogens (nonmetals)

#23 An empirical formula shows the

simplest ratio of the different atoms in a molecule.

A molecular formula shows the exact number and kinds of atoms in a molecule.

A structural formulas shows how these atoms are arranged.

#26 A) 4 B) 6 C) 9

#28 See board A) Draw C2H5Br (1-bromo-ethane)

B) Draw C2H7N ( dimethylamine)

C) Draw CH2Cl2 ( dichloromethane)

D) Draw NH2Cl (chloroamine)

#30 A) SN B) C7H15

C) C3H5O

D) P2O3

E) C3H5F4

F)SiO3

#32 A) Ba2+

B) La2+ or La3+

C) Ga3+

D) S2-

E) Br -

#61Symbol 52Cr3+ 130I- 107Ag+ 119Sn2+ 75As3-

Protons 24 53 47 50 33

Neutron 28 77 60 69 42

Electron 21 54 46 48 36

Net charge

3+ 1- 1+ 2+ 3-

Chapter 2.6 – 2.7 #38 Molecular (all atoms are nonmetals)

c) SCl2 Ionic (formed by a cation and an

anion, usually contains a metal cation)— a) Sc2O3 b) NaI d) Ca(NO3) 2 e) FeCl3 f) LaP g) CoCO3 h) (NH4) 2SO4

#39 A) ClO2

- B) Cl- C) ClO3-

D) ClO4- E) ClO-

#42 A) silver sulfide B) barium phosphate C) magnesium chlorate D) strontium sulfite E) cobalt (II) bromide (cobaltous bromide) F) tin (II) iodide (stannous iodide) G) chromium (III) nitrate (chromic nitrate)

#42 continued H) zinc hydrogen phosphate (notice

the lack of roman numerals—it has a definite charge of +2)

I) silver perchlorate (notice the lack of roman numerals—it has a definite charge of +1)

J) ammonium dichromate

#44

A) Mg3N2

B) FeSO3

C) Cr2(CO3)3

D) CaH2

E) Mg(HCO3)2 F) KClO G) Cu(C2H3O2)2

#46 A) HBr B) H2SO3

C) HNO2

D) carbonic acid E) chloric acid F) acetic acid

#48 A) dinitrogen monoxide B) nitrogen monoxide C) nitrogen dioxide D) dinitrogen pentoxide E) dinitrogen tetroxide

#58 A) alkali metal – K B) an alkaline earth metal – Ca C) a noble gas – Ar D) a halogen – Br E) a metalliod – Ge F) a nonmetal in 1A – H G) a metal that forms a 3+ charge- Al H) a nonmetal that forms a 2- charge – O I) a metal that resembles Al - Ga

#62 A) Nickel (II) oxide, 2+ B) Manganese (IV) oxide, 4+ C) Chromium (III) oxide, 3+ D) Molybdenium (VI) oxide, 6+

#63 Fe3S4 could be aq homo mixture where

the Fe2+ and the Fe3+ ions are portions of the lattice structure

#64

A) IO3-

B) IO4-

C) IO-

D) HIO E) HIO4 (or H5IO6)

#67 A) potassium nitrate B) sodium carbonate C) calcium oxide D) hydrochloric acid E) magnesium sulfate F) magnesium hydroxide