WORKSHEET#5, CHEM001 (Review and Chapter 6)

Name: ____________________________ Date: ___________________ 1. What does amu stand for?

2. What is the difference between an ion and an isotope?

➢ Though individual atoms always have an integer number of atomic mass units , the atomic mass on the periodic table is stated as a decimal number because it is an average of the various isotopes of an element.

 

3. A mystery element Y occurs as three isotopes. Analysis of a sample of Y showed:  

 

Isotope Mass Percent Abundance 

1 80.0 amu 55.0 

2 71.0 amu 24.5 

3 69.0 amu 20.5 

 

Calculate the average atomic mass of Y. [8 pts.] 

 

 

 

 

 

 

 

 

 

 

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ANSWER HEY

atomic mass units

ion = variable electron # # PROTONS NEVER CHANGE FORAN

isotope = variable neutron #ELEMENT OF ONE

TYPE

75.54 → 75.5am①

4. Complete the following table. 

Chemical 

System 

Isotopic 

Notation 

Atomic 

Number 

Mass 

Number 

Number 

of 

Protons 

Number 

of 

Neutrons 

Number 

of 

Electrons 

Sr2+      89        

  12  26      10 

Cr          27   

       9  10  10 

    11  23      11 

5. Look up what the four most common isotopes of iron are in nature on Wikipedia (hint:

Google “Isotopes of Iron”). What are they and how many neutrons do each of them have? Based on their percent abundance given by Wikipedia, calculate the standard (average) atomic weight of iron.

6. Mark on the highlighted columns of the periodic table below what charge ions originating

from that column will have.

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839g Sr 38 38 51 36

Mg"

Emg

12 14

Ifor 2451 24 24

F-Ioff 9 19

Na 73 Na 11 12

( 0.0584 )( 54 ) -110.91754 ) ( 56 ) -1(0.02119/157)+(0.00286×58)=55.9l0a↳ see CIAAW " UNCERTAINTY "& WIKI PAGE ON

"

STANDARD ATOMIC WEIGHT"

7. What would be the systematic name of HCl placed in water? What would it be if anhydrous? 

 

In water: ______________________________________ 

 

 

Not in water: ___________________________________ 

 

8. If calcium and phosphorous were to chemically combine, what would be the correct formula 

of the compound formed and its systematic name?  

 

Formula: _____________________ Name: ______________________  

9. If aluminum and sulfate were to chemically combine, what would be the correct formula of 

the compound formed and its systematic name? 

 

Formula: _____________________ Name: ______________________

10. Write the formula and name of the compound that will be formed between these elements:

a. Al and S

Formula: _____________________ Name: ______________________

b. H and F Formula: _____________________ Name: ______________________

c. K and N Formula: _____________________ Name: ______________________

d. Sr and O Formula: _____________________ Name: ______________________

e. Cs and P Formula: _____________________ Name: ______________________

f. Al and Cl Formula: _____________________ Name: ______________________

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hydrochloricacid

hydrogen chloride

Cats: calcium phosphidef

NOT SULFUR . THIS IS THE POLYATOMIC ANION .

API@0453 aluminum sulfate

APIS} aluminum sulfide

HF hydrogen fluoride

KSN potassium nitride

Sno strontium aide

Cssp cesium phosphide

At Cls aluminum chloride

11. Write formulas for the following:

a. Calcium chloride

b. Magnesium oxide

c. Barium phosphide

d. Magnesium nitride

e. Lithium oxide

f. Calcium bromide

g. Strontium chloride

h. Calcium sulfide

i. Ferric chloride

j. Ferrous chloride

k. Cuprous chloride

l. Cupric chloride

m. Tin (IV) chromate

n. Tin (II) fluoride

o. Chromium (III) bromide

p. Copper (I) oxide

q. Carbon monoxide

r. Carbon dioxide

s. Disulfur decafluoride

t. Phosphorous pentachloride

u. Sodium hydrogen carbonate

v. Sodium hydrogen sulfide

w. Sodium potassium sulfate

x. Sulfur dioxide

y. Calcium nitrite

z. Sodium oxide

aa. Copper (II) sulfate

bb. Hydrochloric acid

cc. Hydrogen chloride

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catch Cut :O"

Mg "O"

CO

Ba4p3-

CO23 2

Mg }tNE Szfzo

Lito " PCGcat'BrI

NaHC03sick Na HS

Zt 2-

Cas NAHSOYFe

Cts502

Feck Ca ( NodaCua Naf

Cache Ca"

§04)Sn "( Crop )z HCl in water-12Snfz

HClCrist Brj

12. Name the following compounds. Assume all acids are in water:

a. FeS

b. PbI2

c. SnF4

d. Fe 2O3

e. CuO

f. HI

g. HBr

h. HCl

i. H2SO4

j. HC2H3O2

k. H3PO4

l. H2CO3

m. PbO2

n. PBr2

o. I4O9

p. SiCl 4

q. P4S7

r. IF6

s. S2F10

t. HNO3

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' mouth sulfide hydrogen phosphatelead LI ) iodide carbon're acidtin (E) fluoride lead (E) aide

iron (E) wide Pb Bra lead (E) bromide

Copper ) Oxide tehaiodinenonaeide

hydrofluoric acid silicon tetrachloridehydralhomie acid tetraphasphmausheptnchlou.de

hydrochloric aid iodine hexafluorideThis one toosufomupligatead;D . answer was disulfmdeeafluouik

hydrogen acetate hydrogen nitrate

13. Complete the table, filling in each box with the proper formula and name.

SO42- OH- AsO43- C2H3O2- CrO42-

NH4+

Ca2+

Fe 3+

Ag +

Cu 2+

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(NH 4)2604) NHYOH

(NH4)zfAs04)(NHy)kzHs0a)dH4hCr04

ammonium ammonium

Sulfateammonium ammonium ammonium

hydroxide arsenide acetate chromate

Casa , CACOH)z

CasAs04)zCa(czHzOdz

CaCr04

calcium cabins Calvin Calum calaissulfate hydroxide arsenate awhile chromate

Feds 0433 Fe (OH)z Fe Addy FeKzHs0ds Federals(E)

ironyiron#lion LED lion ( It ) lion LEDSulfate hydroxide Arsenate acetate chromateAg 2504 AglOH) AgsAsap . AgkzHsOd Aga Croy( I ) silvery semen stunt ) silmtt ) silnntt )sulfate hydroxide arsenate acetate chromate

Casal Cul OH)z Cuzftsoy) a Culcdtsodz CuCr04(E) copper # cappn.CH copper # copper LII ) Cappel'Dsulfate hydroxide arsenate acetate chromate

14. [SIG FIGS] Multiply the following numbers and report the answer to the correct number of sig figs.

x 10 10.0 1.80 x 10-3 40000

14.6

15.0

0.15

4.180

15. [PRECISION] Add the following numbers and report them to the correct precision.

+ 10 10.0 358 1.80 x 10-3 40000

14.6

15.0

0.15

4.180

16. [SCI NOTATION] Write the following numbers in scientific notation with correct SFs.

a. 1800000

b. 3400002

c. 1555.90

d. 0.0000000067 17. [UNIT CONVERSION] Convert the following units.

a. 14.6 J = _______________ kJ

b. 101 °C = ________________ °F

c. 201 °C = ________________ °K

d. 0.673 m3 = ______________ cm3

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100 146 2.63×10-2 600000

200 1.50×102 2.70×10-2 600000

2 1.5 2.7×10-4 6000

40 41.8 7.52×10-3 20000

20 24.6 373 14.6 40000

30 25.0 373 15.0 40000

10 10.2 358 0.15 40000

10 14.2 362 4.182 40000

www w

1.8×106 1.55590×103www www

3.400002×1066.7×70-9

0.0146 474

14.6J xtOR 1.46×10-2

1000J

214 6.73×105

1003cm 's0.673ms × - → 673,000cm '

13 m3