Density Practice: Worksheet # 1Calculate density, and identify substances using a density chart.

Density is a measure of the amount of mass in a certain volume. This physicalproperty is often used to identify and classify substances. It is usually expressed ingrams per cubic centimeters, or g/cm3. The chart on the right lists the densities ofsome common materials.

Equation: Density = mass or D = mVolume V

Substance

GoldMercuryLeadIronAluminumBoneGasolineAir (dry)

/j,/

Density(g/cma)19.313.511.47.873.7

1.7-2.0

0.66-0.69

0.00119

Problem StatementSample: What is the density of abilliard ball that has a volume of100 cm3 and a mass of 250 g?1. A loaf of bread has a volumeof 2270 cm3 and amass of 454 g.What is the density of the bread?

FormulaD=m

VD = 250 g

100 cm3

D-mr'ÿ/ ÿ,ÿ

V

4.What is the mass of the blockof, iron illustrated below?

2. A block of wood has a densityof 0.6 g/cm3 and a volume of1.2 cm3. What is the mass of theblock of wood?3. A 800g boulder has a densityof 8 g/cm3. What is the volumeof the boulder?

sÿ

M = 250 gV = 100 cm3

Defme Variables Substitution Answer

2.5 g/cm3.

10 cm

"1%,] o_- jÿ£,ÿm/,,,

f--v'

t it, sÿ t k;'ÿ-,- ,/ÿ,. ' Lÿ)' # /' ,

4725

171

148

475

680

15

40

250

1000

Use the data below to calculate the density of each unknown substance. Then use the density chart above todetermine the identity of each substance.Mass (g) Volume D = m/v

(eraa) Variable Substitutions350 D = 4725

350

tl' '-)//L.ÿ)_D ,ÿo

D -

' ÿ 3(I' '

Density(g/cm3)

D = 13.5 Mercury

"!?/ i tC

Substance

Properties of Matter/Density Quiz Name:

Date:

1. Fill in the missing spaces in the table.

Term DefinitionViscosity

Malleability

Luster

Ability to be stretched and then returned to its initialsize and shape

Tendency to break or shatter

Ability to be pulled into wires

Measure of how much stress or tension a material

can handle without breaking

2. A paperclip is placed in water in a graduated cylinder. Before the paperclip was placed

in the water, the graduated cylinder measured 5.7 mL. After the paperclip was placed in

the water, the cylinder measured 6.3 mL. What is the volume of the paperclip? Show

your work. { ÿ;ÿ • ÿ ........ \

3, If the mass of the paperclip in #2 is lÿ;wtiaÿt istlÿe -dÿensity of the paperclip? __ÿI

J ÿ .... \]°, Iÿ t'i {,,< ÿ " b/ "'- iÿ"ÿ 7+, ,ÿ. t W H i! t<,W

7' 4 7ÿ+vt llf!ÿ, ,} ÿ,x ,,+ i, 7 ÿ; 'ÿ " i

Name: Date,: CONTENT

15.1 The Periodic Table

Many science laboratories have a copy of the periodic table of the elements on display. This importantchart holds an amazing amount of information. In this sldll sheet, you will use a periodic table to identifyinformation about specific elements, make calculations, and make predictions

Periodic table primer

To work through this skill sheet, you will use the periodic table of theelements. The periodic table shows five basic pieces of information.Four are labeled on the graphic at right; the fifth piece of information isthe location of the element in the table itself. The location shows theelement group, chemical behavior, approximate atomic mass and size,and other characteristic properties.

Atomic number

Element symbol .

Element name --

Atomic mass

.12

>C-ÿ Carbon

---ÿ 12.011

Review: Atomic number, Symbol, and Atomic Mass

Use the periodic table to fred the answers to the following questions. As you become more familiar with thelayout of the periodic table, you'll be able to find this information quickly.

Atomic Number: Write the name of the element that corresponds to each of the following atomic numbers.

8i! cs

12. ÿ0ÿtgmiÿ4rÿassÿÿ2,

13. ÿhyJsn:t4keÿ-atomricÿmasÿÿngmber-?ÿ

14. Why don't we include the mass of an atom's electrons in the atomic mass?

0 Vtÿ?/ 4,f'r, ,"'I'+,':', 1ÿ,t,,\x,LA 1 ÿJl' :t; ..,'ÿ ....

17. Fe lO. Na ÿ ÿ

"--OL.t ÿ lit Wÿ

11. Bi

CONTENTPage 2 of 2

Periodic Table Groups

The periodic table's vertical columns are called groups. Groups of elements have similar properties. Use theperiodic table and the information found in Chapter 15 of your text to answer the following questions:

15. The first group of the periodic table is known by what name?/0ÿ I kÿ ti ÿ

16, Name two characteristics of the dements in the first group.

17. Name three members of the halogen group., t-1-lt)'V !,! ')'Hÿ I(iÿ,nÿ,ÿ,¢ÿ'

18. Describe two characteristics ofhalogens["iÿ)ÿ]{ @ ÿ ÿ :ÿ:

¢19. Where are the noble gases found on the periodic table? i :ÿ{ ÿ(

20. Why are the noble gases sometimes called the inert gasÿs? ÿ

J .... i-, , ''.. '

Periodic Table Rows

The rows of the periodic table correspond to the energy levels in the atom. Thefÿrst energy level can accept up to two electrons. The second and third energylevels can accept up to eight electrons each, The example to the right shows howthe electrons of an oxygen atom fill the energy level. 8Show how the electrons are arranged in energy levels in the following atoms:.

21. He

21ÿ

22. N ....

2!

24, A1 lÿ-ÿ)

ooooo ai2:

2-_Y7i ;:12:!!!

Identify each of the following dements:.

NameJÿ k

"J Date

-ÿ}Periodic Table Worksheet

Class

Tell which element is Iocateÿd in the following groups and periods.

a. group 4, period 5 h.

b. ÿ C group 2, period 2 i.

group 16, period 6

group 17, period 3

c. group 6, period 6

d. group 18, period !

j°

Vk.

group 11, period 5

. group 5, period 4

e. group 14, period 5

f. ÿ v% group 12, period 4

g. , , group 1, period 7

m.

n°

group 10, period 6

group 13, period 3

group 15, period 6

, For each of the following, label as a metal nonmetal, metalloid.

a. i[Lt>@.ÿ./ÿ.dt?'c<{ poor conductor of electricity

b. ÿVÿ, C.ÿ .... t ÿ ÿ usuallyÿ a solid at room temp/

ductile

chlorine

semiconductor

silicon

malleable

usually a gas at room temp

cobalt

good conductor of heat

brittle

I. A © v', y, ÿ>>ÿ=t ÿ oxygen

Name Date Class

3. Vertical columns on the periodic table are called

4. Horizontal rows on the periodic table are called

5. The number of protons in an atom is that element's number.

6. The number of protons and neutrons in an atom is that atom's V'tLÿ;ÿo¢# number.

7. The ability of a material to be drawn into a thin wire is called d-ÿIÿ;ÿ'ÿi¢

8. The abiliÿ/of amaterial to be pounded into thin sheets is called ÿ'ÿ(ÿ(ÿ-@i ti>ÿ

9. The elements m groups 3 through 12 are called the

10. The elements m group 1 are called the Gt. [ÿJÿ

11. The elements in group 2 are called the ÿ?oÿ

12. The elements m group 18 are called the ÿoO, ÿ[ÿ

13. The elements ,n group 17 are called the ÿL ÿ ÿoÿ ÿ.ÿ:#

14. The elements m group ÿ are the most reactive metals.

15. The elements in group

16. The elements ,n group

are the most reactive nonmetals.

are very unreactive.

17. The elements m group react very violently with water.

18. Complete the following atomic chart.

Symbol

Ca

Ni

# OFPROTONS

#OF "

NEUTRONS

13

# OFELECTRONS

Li

3\15

#

ATOMICNUMBER

16

9

3

MASSNUMBER

31

18

61

NaminR Covalent Compounds

Nalne: Period:

Write the formulas for the following covalent compounds."

1) nitrogen tribromide

2) hexaboron monosilicide

3) crone dÿoxide d tCiÿ

4) hydrogen monoiodide

5) iodine pentafluoride

6) dinitrogen trioxide

7) nitrogen trihydride (ammonia) /i'd {'ÿ

8) phosphorus triiodide iÿ) ÿiÿi

9) dihydrogen monoxide

10) diphosphorous pentoxide

Write the names for the following covalent compounds."

II)

12)

13)

14)

15)

16)

iv)

18)

19)

20)

P4S5

02

SF6

Si2Br6

SC14

CH4

B2Si

NF3

H20

N2Os

S,,U I,/i'+j dÿ-=.

(

. Using the periodic table, not Bohr models, determine

how miny valence electrons the following elements have.

a. Calcium ÿ.ÿ

b. Sulfur ÿ

c. Neon

d. Aluminum'ÿ

e. Argon

i0. Using the periodic table, determine what charge each

of the following ions will have:a. BeÿfA

b. BiÿIc. N-%

d.F .... t

e. Na+[

ii. Determine what compound is formed when the following

elements are ionized and combined. Write the formula and

name of the compounds.

a. Mg + O

b. Cl + Ca

li ................ /

d. Be + N-

e.F+Naid ................. < -

/ 'g

Counting

WorksheetCount the atoms present in the different compounds by using the coefficients and subscripts,

K2CO3 Ba3(PO4)2

Type of Atom # of Atoms Type of Atom # of Atoms

7Total Total

Na2CrO4 3 CaCl2

Type of Atom # of Atoms Type of Atom # of Atoms

TotalTotal

NH4C2H302 4 AI2(COÿ)3

Type of Atom # of Atoms Type of Atom

Total

# of Atoms

.S%Total tn

Pb(NOÿ)2 2 (NH4)2Cr207

Type of Atoms

Total •

# of Atomsi

Type of Atom

Total

# of Atoms

g#½

uations Worksheet

1)

2)

3)

4)

5)

6)

7)

8)

9)

lO)

11)

12)

13)

14)

15)

16)

17)

18)

19)

2O)

• I Na3P-O4 +

__ MgF2 + __P4+

RbNO3 +

-, AgNO3 +__

! CF4 +

HCN +

GaF3 +

CH4 +

2.. NaaP04 +

F2 :->

Li2Se -->

H2SO4 -) t

H2 + AICI3

__, NF3I SSe2 +

__ (NH4)2SO4

Li20

© 2004 Cavalcade Publishing, Aft Rights Reserved For chemisby-help, visit www.chemfiesta.com

SCIENTIFIC NOTATION AND SIG FIGREVIEW

SI GIN-IFI CA_NT FIGURES

STATE THE NUlÿIBER OF SIGNIFICAN[ÿ DIGITS IN EACHMÿ_A SURElVIENT.

• 1) 2804 ÿi ÿ+ 2) 2.84 ÿ ÿ a) s.0ÿ9 M %

4) O. 003068 Ivl Lÿo 5) 4, 6 X 105 Ivi ÿ< 6) 4.06 X 10-5 Ivi

"1) 750 ÿx k 8) 75 ÿ ÿ ..... 9) 75,000 ÿ 5.,.

75.00 rÿ % 11) 75,ooo.o M ÿ

SCIENÿnÿIC NOTATION

19) i0 CM

WRITE EACH NU2VIBER IN SCIENTIFIC NOTATION.6

1) 0.000006 ÿ x" 10 2) 54000.00 < ÿO<X><>cÿ ;< '

3) 60 g ?< I'O 4) 0.009 ql i< [Q

5) 6.7 ¢ÿ ÿ?ÿ x{O 6) 0.0000002 ÿ- X

7) 2oooooo G<,?: (0 8) 71000

9) 489oo ÿf,ÿi ÿ: to lO) 0.oo00009 q ÿ: to

k, IOii) 0.630 (ÿ 5 .ill> ,xÿ ÿ0 12) 33 L

13) 0.0002163

;ÿ X I0 •14) 0.0049, £'ÿ, L X {.0; "

©

SCIENTIFIC NOTATION A_N-D SIG FIGREVIEW

• ÿVRITE EACH NUM:BER IN STANDARD NOgÿATION.

17) 0.9 x 10-1 0,0 c< is) 2 x 10-1 <ÿ ÿ,ILÿ,

19) 2 x lOs 20) so4 × lOÿ <iÿoq:O<>

21) 9.66 x 10ÿ ÿ_ÿ ÿCÿ:> 2ÿ) 1.5 × lO-ÿ O,O fÿ;ÿ

23) 7.75 x 10-1 diÿ ,ÿÿ°ÿ '°-ÿ ÿ" 24) 8.3 x 107 ÿL !>C><ÿ' G<i} ©<:>

25) 9.5 x 10ÿ ÿ) (ÿ<:1ÿ; 'Iÿ 26) 1.'71 x 107 ! ÿ'?l 'ÿÿ ........

-2'7)-0.9 x 10-8 <ÿ,i, <><>5 <ÿ',

29) '7.5 x 10-s dÿ', <jC:O<ÿ:ÿ ÿ/:::::ÿf

30) 4 x 100

Sl) 8.ÿ × lOs ÿg c{ÿ oocÿ<> sÿ) 4 x lO-S (ÿ). O<:;C:)o c!.