Density Practice: Worksheet # 1

Calculate density, and identify substances using a density chart.

Density is a measure of the amount of mass in a certain volume. This physical

property is often used to identify and classify substances. It is usually expressed in

grams per cubic centimeters, or g/cm3. The chart on the right lists the densities of

some common materials.

Equation: Density = mass or D = m

Volume V

Substance

Gold

Mercury

Lead

Iron

Aluminum

Bone

Gasoline

Air (dry)

/

j,/

Density

(g/cma)

19.3

13.5

11.4

7.87

3.7

1.7-2.0

0.66-0.69

0.00119

Problem Statement

Sample: What is the density of a

billiard ball that has a volume of

100 cm3 and a mass of 250 g?

1. A loaf of bread has a volume

of 2270 cm3 and amass of 454 g.

What is the density of the bread?

Formula

D=m

V

D = 250 g

100 cm3

D-m

r'ÿ/ ÿ,ÿ

V

4.What is the mass of the block

of, iron illustrated below?

2. A block of wood has a density

of 0.6 g/cm3 and a volume of

1.2 cm3. What is the mass of the

block of wood?

3. A 800g boulder has a density

of 8 g/cm3. What is the volume

of the boulder?

sÿ

M = 250 g

V = 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 to

determine the identity of each substance.

Mass (g) Volume D = m/v

(eraa) Variable Substitutions

350 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 Definition

Viscosity

Malleability

Luster

Ability to be stretched and then returned to its initial

size 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? __ÿ

I

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 important

chart holds an amazing amount of information. In this sldll sheet, you will use a periodic table to identify

information about specific elements, make calculations, and make predictions

Periodic table primer

To work through this skill sheet, you will use the periodic table of the

elements. The periodic table shows five basic pieces of information.

Four are labeled on the graphic at right; the fifth piece of information is

the location of the element in the table itself. The location shows the

element 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 the

layout 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

CONTENT

Page 2 of 2

Periodic Table Groups

The periodic table's vertical columns are called groups. Groups of elements have similar properties. Use the

periodic 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. The

fÿrst energy level can accept up to two electrons. The second and third energy

levels can accept up to eight electrons each, The example to the right shows how

the electrons of an oxygen atom fill the energy level.

8

Show how the electrons are arranged in energy levels in the following atoms:.

21. He

21ÿ

22. N ....

2!

24, A1 lÿ-ÿ)

ooooo

ai

2:

2-_Y7i ;:12:!!!

Identify each of the following dements:.

Name

Jÿ 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°

V

k.

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

# OF

PROTONS

#OF "

NEUTRONS

13

# OF

ELECTRONS

Li

3\

15

#

ATOMIC

NUMBER

16

9

3

MASS

NUMBER

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. BiÿI

c. 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+Na

id ................. < -

/ 'g

Counting

Worksheet

Count 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

7

Total Total

Na2CrO4 3 CaCl2

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

Total

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 Atoms

i

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

__, NF3

I SSe2 +

__ (NH4)2SO4

Li20

SCIENTIFIC NOTATION AND SIG FIG

REVIEW

SI GIN-IFI CA_NT FIGURES

STATE THE NUlÿIBER OF SIGNIFICAN[ÿ DIGITS IN EACH

Mÿ_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

, IO

ii) 0.630 (ÿ 5 .ill> ,xÿ ÿ0 12) 33 L

13) 0.000216

3

;ÿ X I0 •14) 0.0049, £'ÿ, L X {.0; "

©

SCIENTIFIC NOTATION A_N-D SIG FIG

REVIEW

• 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"

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/:::::ÿ

f

30) 4 x 100

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