uses of chapter one

Question 1

all of main transion element from nearly ……. of the weight

of earth crust but they have high …………

Answer 1

1. 7%
2. economic importance

Question 2

the properties of scandium

Answer 2

rarely exists in earth crust and spread on a large area of earth crust

Question 3

uses of scandium and why

Answer 3

added to mercury vapor lamp to produse light with high quality looks like sun light so it used in tv , photography at night

Question 4

scandium alloy and propertis and uses

Answer 4

1. scandium with aluminum
2. alloy is light and very hard alloy used in manufacture of mig fighter jets

Question 5

titanium properties

Answer 5

it is very hard similar to steel but less density

Question 6

uses of ti

Answer 6

uses in dental implantes and artificial joints

Question 7

give reason ti uses in dental implantes and artificial joints

Answer 7

bec the body doesnt eject it and doesnt cause any type of poisoining

Question 8

why ( titsnium _ aluminum )

used in manufacture of airplane and space shutle

Answer 8

because it maintains its durability at high temperature while srength of aluminum decreases

Question 9

titanium alloys

Answer 9

1. titanium with aluminum
2. alloy used in manufacture of airplane and space shutle

Question 10

titanium compounds

Answer 10

titanium dioxide tio2

Question 11

tio2 use in ………..

Answer 11

sun protction cosmetics

Question 12

why tio2 use in sun protction cosmetics

Answer 12

bec minute nanoparticles of it protect skin from the effect of ultraviloet rays

Question 13

properties of v

Answer 13

silver grey element , very hard and resists corrosion

Question 14

vandium alloys

Answer 14

added to steel by small proprtion forming a high hardness and has great ability to resist corrosion

Question 15

uses of vandium alloys

Answer 15

in manfcture of car spring

Question 16

vandium compounds

Answer 16

vanadium pentaoxide V₂O₅

Question 17

vandium compounds uses

Answer 17

use as a catalyst

1. -in manfuacture of strong magnetic conductors
2. manfucture of dyes used in ceramic
3. manfucture of glass industry

Question 18

properties chromium

Answer 18

high chemically active element but resists the effect of atmospheric air

Question 19

chrmomium is chemically active metal , but resists rust and corrosion factors GR

Answer 19

duto the formation of non porous oxide layer on its surface which prevents oxidation

Question 20

uses of cr

Answer 20

plating of metals to protect it from rust and leather tanning دباغة الجلود

Question 21

chromium compounds is and they uses

Answer 21

1. chromium trioxide (Cr2 O3) used in manfacture of dyes الاصباغ
2. potassium dichromate (K2 Cr2 O7) IS an oxidizing agent

Question 22

properties of manganese

Answer 22

it is not used as a pure metal but used in alloys or compounds

Question 23

why manganese not used as a pure metal but used in alloys or compounds

Answer 23

bec it is brittle metal معدن هش

Question 24

manganese alloys and used

Answer 24

1. Ferromanganes allo (manganese and iron) alloy used in manufacture of railway tracks قضبان القطر
2. manganese and aluminum alloy used in manufacrure of soft drinks cans

Question 25

give reason Ferro manganese manganese and iron alloy used in manufacture of railway tracks

Answer 25

bec it is harder than steel

Question 26

give reason manganese and aluminum alloy used in manufacrure of soft drinks cans

Answer 26

bec it resists corrosion يقاوم التاكل

Question 27

manganese compounds and used

Answer 27

1. manganese dioxide ( Mn O2 ) acts as a strong oxidizing agent in dry cell potassium permanganate 2. ( KMnO4 ) used as antiseptic مطهر manganese sulphate 3. ( Mn SO4 ) used as a fungicide مبيد الفطريات

Question 28

properties of iron

Answer 28

it is the most abundant transtion element in the earth s crust

Question 29

uses of iron

Answer 29

1. reinforced concrete خرسانة مسلحة - 2. electricity pylons أبراج الكهرباء - 3. knife 4. gun and canon pipes مدفع الحروب القديمة - 5. used in catalyst in manufacture of ammonia gas by haber - bosh method N₂ + 3H₂ →Fe /500-200atm→2NH 6 6. used as a catalyst in liquefaction of water gas (H2 - CO) to use as fuel by (fischer - tropsh ) method

Question 30

properties of cobalt

Answer 30

1. it is similar to iron in which both of them can be magnetized so they are used in manfucture of magnet 2. has 12 radioactive isotopes

Question 31

what is uses of cobalt

Answer 31

chromium used in manufacure of modern dry baeries that is used in cars

Question 32

cobalt 60 produces ......................... and uses

Answer 32

produces gamma rays which has a high penetration power so it used in 1. preservation of food 2. detection the quality of industrial products as it detects the sites for cracks and welding connections 3. in medicine used to diagnoses and treatment of tumors

Question 33

nickel uses

Answer 33

1. it is used in manufacture of nickel cadmium battery that can be recharged 2. it used in plating of metals to protect it from corrosion and rust 3. divided nickel is used as a catalyst in hydrogenation of oils

Question 34

nickel alloys and uses an properties

Answer 34

1. nickel with steel alloy is very hard and resists corrosion , rust and acids 2. nickel with chromium alloy used in heating coils and electric furnaces

Question 35

nickel with chromium alloy used in heating coils and electric furnaces

Answer 35

because it resist corrosion and melting when it is heated to the degree of redness

Question 36

properties of copper

Answer 36

copper is the first dicovered metal

Question 37

uses of copper

Answer 37

it used in manufacture of electric wires and coins

Question 38

give reason copper used in manufacture of electric wires

Answer 38

because it is good conductor of electricty

Question 39

copper alloys

Answer 39

manfufacture of alloys like bronze alloy

Question 40

bronze alloy consists of

Answer 40

copper and tin

Question 41

copper compounds and uses

Answer 41

1. copper sulphate ( CuSO4 ) used as insecticides and fungicide in purification of water 2. Fehling reagent used to detect glucose as it turns from blue to orange in glucose solution

Question 42

uses of zinc

Answer 42

it is used in galvanization of metals to protect them from rust and corrosion

Question 43

zinc compounds and uses

Answer 43

1. zinc oxide ( ZnO ) used in manufacture of paints , rubber and cosmeticsمستحضرات تجميل 2. zinc sulphide ( ZnS ) used in manufacture of illuminating paintsالدهانات المضيئة and x - ray

Question 44

give reason titanium with aluminum alloy used in manufacture of aircrafts and space shuttle

Answer 44

because it maintains its durability at high temperature while strength of aluminum decreases

Question 45

vanadium added to steel in a small proportion why

Answer 45

to forming a high hardnees and has a great abilty to resist corrosion