Metals, Metalloids and Non-metals

Metals, Metalloids and Non-metals
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The elements in the periodic table can also be divided according to whether they are metals, metalloids or non-metals. The zigzag line separates all the elements that are metals from those that are non-metals. Metals are found on the left of the line, and non-metals are those on the right. Along the line you find the metalloids. You should notice that there are more metals then non-metals. Metals, metalloids and non-metals all have their own specific properties.
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Metalloids

Description : Metalloids

Last Answer : Metalloids or semi-metals have mostly non-metallic properties. One of their distinguishing characteristics is that their conductivity increases as their temperature increases. This is the opposite of what ... as computers. The metalloids include elements such as silicon (Si) and germanium (Ge).

Non-metals

Description : Non-metals

Last Answer : In contrast to metals, non-metals are poor thermal conductors, good electrical insulators (meaning that they do not conduct electrical charge) and are neither malleable nor ductile. The non-metals include elements such as sulphur (S), phosphorus (P), nitrogen (N) and oxygen (O).

Give reason: a) Metals are electropositive. b) Non-metals are electronegative. c) Even though hydrogen is a non-metal, it is electropositive. d) Sodium is electropositive.

Description : Give reason: a) Metals are electropositive. b) Non-metals are electronegative. c) Even though hydrogen is a non-metal, it is electropositive. d) Sodium is electropositive.

Last Answer : a) Metals are electropositive. Electropositive element has the tendency to lose electrons and form cation.Metals are electron donors. Hence they are electropositive. b) Non-metals are ... is electropositive because donates electrons from last orbit to another element and becomes electropositive.

science Topic : Metals Fill in the blanks.

Description : science Topic : Metals Fill in the blanks.

Last Answer : 1. An example of a liquid metal is Mercury/gallium. 2. A metal which is soft is sodium. 3. A metal which lacks ductility is sodium. 4. A non-metal which is lustrous is graphite/iodine ... 59. Aluminium+ copper+ magnesium+ manganese is useful in making aircraft bodies. 60. Ornamental gold is an alloy

How are the properties of alloys different from those of metals?

Description : How are the properties of alloys different from those of metals?

Last Answer : Copper is reddish and zinc is grayish in colour where as brass which is an alloy of copper and zinc is golden yellow in colour. Iron is a magnetic substance but stainless steel, an alloy of iron is non magnetic.

Give reason: Metals belonging to the same group form good alloys.

Description : Give reason: Metals belonging to the same group form good alloys.

Last Answer : As metals belonging to the same group in the periodic table have similarities in electronic configuration.

Name some metals which do not displace hydrogen from dilute acids.

Description : Name some metals which do not displace hydrogen from dilute acids.

Last Answer : Platinum, gold, silver, mercury & copper do not displace hydrogen from dilute acids.

Give reason: Some metals are more reactive than others.

Description : Give reason: Some metals are more reactive than others.

Last Answer : Metals are electropositive and have tendency to donate electrons. Some elements give up their valence electrons and hence more reactive.

How do metals react with sulphur?

Description : How do metals react with sulphur?

Last Answer : Metals react with sulphur forming respective sulphides. Iron reacts with sulphur forming ferrous sulphide.

How do metals react with chlorine?

Description : How do metals react with chlorine?

Last Answer : Metals react with chlorine to form respective chlorides. Aluminium reacts with chlorine to form aluminium chloride.

How do metals react with hydrogen?

Description : How do metals react with hydrogen?

Last Answer : Metals react with hydrogen to form respective hydrides. Calcium reacts with hydrogen to form calcium hydride.

How do metals react with nitrogen?

Description : How do metals react with nitrogen?

Last Answer : Metals react with nitrogen forming respective nitrides at high temperature. Magnesium reacts with nitrogen to form magnesium nitride.

Metals

Description : Metals

Last Answer : Examples of metals include copper (Cu), zinc (Zn), gold (Au), silver (Ag), tin (Sn) and lead (Pb). The following are some of the properties of metals: Thermal conductors Metals ... are nonmagnetic. You can see how the properties of metals make them very useful in certain applications.

Describe the effects of temperature on conductivity of metals.

Description : Describe the effects of temperature on conductivity of metals.

Last Answer : For metallic conductors, the resistance of all pure materials increases linearly with temperature over a limited range of temperature hence conductivity decreases. For metallic conductors, ... vibrating ions collide with the moving electrons. Hence resistance increases with increasing temperature.

With rise in temperature the resistance of pure metals?

Description : With rise in temperature the resistance of pure metals?

Last Answer : With rise in temperature the resistance of pure metals increases.

Elements that show the properties of both metals and non-metals are called (a) Allotropes (b) Metalloids (c) Alloys (d) Colloids

Description : Elements that show the properties of both metals and non-metals are called (a) Allotropes (b) Metalloids (c) Alloys (d) Colloids

Last Answer : Ans:(b)

Which is not a type of elements? (1) Metals (2) Non Metals (3) Metalloids (4) Gases

Description : Which is not a type of elements? (1) Metals (2) Non Metals (3) Metalloids (4) Gases

Last Answer : (3) Metalloids Explanation: Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei. There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.

Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature (D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Description : Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature ... & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Define Metals , Non Metals & Metalloids.

Description : Define Metals , Non Metals & Metalloids.

Last Answer : Metals : 1. They are electropositive elements. 2. Their oxides are basic. 3. They tend to lose electrons & form positive ions. 4. They are lustrous , malleable & ductile except Hg which is the ... acidic ) in nature. 3. They are concentrated between the metals & the nonmetals in the periodic table.

In known elements, the maximum number is of [CPMT 1985] (A) Metals (B) Non-metals (C) Metalloids (D) None of these

Description : In known elements, the maximum number is of [CPMT 1985] (A) Metals (B) Non-metals (C) Metalloids (D) None of these

Last Answer : (A) Metals

Magnetic and Non-magnetic Materials

Description : Magnetic and Non-magnetic Materials

Last Answer : We have now looked at a number of ways in which matter can be grouped, such as into metals, semi-metals and non-metals; electrical conductors and insulators, and thermal conductors and insulators. ... information must be stored, in computers and TV's, as well as in generators and electric motors.

Linear and non-linear device

Description : Linear and non-linear device

Last Answer : Linear and non-linear device

What are memory alloys? How are they useful?

Description : What are memory alloys? How are they useful?

Last Answer : Certain alloys which regain their original shape when deformed are called memory alloys. Preparation of memory alloys saves energy of melting and recasting of used articles.

Write a note on contributions of Indians to metallurgy.

Description : Write a note on contributions of Indians to metallurgy.

Last Answer : a) Romans used armour and cutlery made from Indian iron. b) Indian metallurgist Nagarjuna wrote the book Rasaratnakara' in 9th century BC which explained the preparation of various metallic ... near Qutab Minar constructed by Vikramadithya about 1600 years ago has withstood the action of weather.

Why is 6% to 8% copper added to gold in making ornaments?

Description : Why is 6% to 8% copper added to gold in making ornaments?

Last Answer : Pure gold is very soft, it cannot be used to make artistic ornaments. To make it hard, improve the looks and colour, 6 to8% copper is added to ornamental gold.

Which metal is present both in brass and bronze?

Description : Which metal is present both in brass and bronze?

Last Answer : Copper

What property of invar steel is used in making pendulums and measuring tapes?

Description : What property of invar steel is used in making pendulums and measuring tapes?

Last Answer : Invar steel has the least co-efficient of linear expansion.

What property of stainless steel is used in making surgical instruments?

Description : What property of stainless steel is used in making surgical instruments?

Last Answer : Surgical steel is not attacked by mild chemicals easily and it does not corrode.

Why are alloys made?

Description : Why are alloys made?

Last Answer : Alloys give desired properties to the metal. It improves the properties of metals.

How is an alloy formed?

Description : How is an alloy formed?

Last Answer : Alloysare prepared by mixing the various metals in their molten state and cool them to room temperature. Better quality can be made by mixing metals using ultrasonics.

What is an alloy?

Description : What is an alloy?

Last Answer : An alloy is a homogenous mixture of two or more metals or metal with a non-metal. Example: Brass is an alloy of two metals copper and zinc. Steel is an alloy of a metal iron and non-metal carbon.

Briefly explain the electrolytic refining of copper.

Description : Briefly explain the electrolytic refining of copper.

Last Answer : Copper is purified by electrolytic refining. The apparatus consists of an electrolytic tank containing copper sulphate solution as electrolyte. A set of thick blocks of impure copper is made anode ... anode becomes thinner and pure cathode becomes thicker. The impurities collect at the bottom.

What is electrolytic refining?

Description : What is electrolytic refining?

Last Answer : Electrolytic refining is a technique of ultra refining of metal. In this method, impure metal is taken as anode and pure metal are taken as cathode. Electric current is passed through the electrolyte to obtain pure metal at the cathode.

Explain the process of zone refining. Name one metal refined by this method.

Description : Explain the process of zone refining. Name one metal refined by this method.

Last Answer : The apparatus used for zone refining consists of a circular heater fitted around the rod of impure metal at one end. The circular heater is slowly moved to the other end. At the heated zone, ... in solid metal passes into the adjacent molten part. A metal refined by zone refining is germanium.

What is meant by zone refining or fractional crystallization?

Description : What is meant by zone refining or fractional crystallization?

Last Answer : Zone refining is a technique of obtaining ultra pure metal. It is based on the principle of differences in solubility of impurities in liquid and solid states of the metal.

What is meant by liquation process?

Description : What is meant by liquation process?

Last Answer : Liquation is a process of obtaining ultra pure metal. It is based on the principle that metals are readily fusible where as the impurities are infusible at the temperature at which the metals fuse.

Mention the methods of obtaining ultra pure metal.

Description : Mention the methods of obtaining ultra pure metal.

Last Answer : a) Fractional crystallization or zone refining. b) Vacuum melting c) Distillation d) Chemical vapour deposition e) Liquation process

Name the process by which the refining of aluminium is done. Name the material used for the process.

Description : Name the process by which the refining of aluminium is done. Name the material used for the process.

Last Answer : Aluminium is refined by electrolytic refining. Carbon lining acts as the cathode and the graphite rods act as anode.

Briefly explain the extraction of aluminium from alumina with chemical equations.

Description : Briefly explain the extraction of aluminium from alumina with chemical equations.

Last Answer : Aluminium oxide dissolved in molten cryolite is taken in a chamber with gently sloped base.The inner wall is made of carbon lining. Graphite rods are introduced in the electrolyte bath. The carbon lining ... is passed. Molten aluminium collects at the lining and flows out of the gently sloped base.

What is cryolite? Write its chemical formula.

Description : What is cryolite? Write its chemical formula.

Last Answer : Cryolite is chemically sodium aluminium fluoride. Its molecular formula is Na3AlF6.

What is the role of molten cryolite in the extraction of aluminium?

Description : What is the role of molten cryolite in the extraction of aluminium?

Last Answer : When pure alumina is mixed with molten cryolite, it forms an electrolyte at 1223K. Molten cryolite also acts as a solvent for alumina.

What is the difficulty in obtaining aluminium from alumina?

Description : What is the difficulty in obtaining aluminium from alumina?

Last Answer : Pure alumina melts at 2323K. At this temperature, aluminium vapourises and there will be considerable loss. It consumes more energy and also molten aluminium is not a very good conductor of electricity.

Why is pure alumina needed for the extraction of aluminium?

Description : Why is pure alumina needed for the extraction of aluminium?

Last Answer : For electrolysis of we need pure alumina. Hence bauxite is converted into alumina by chemical process.

Why is extraction of aluminium not commercially viable by using reducing agents like coke? OR Coke is used in the extraction of iron but not in the extraction of aluminium. Why? OR Aluminium cannot be extracted by heating bauxite and coke. Why?

Description : Why is extraction of aluminium not commercially viable by using reducing agents like coke? OR Coke is used in the extraction of iron but not in the extraction of aluminium. Why? OR Aluminium cannot be extracted by heating bauxite and coke. Why?

Last Answer : Oxygen of aluminium oxide cannot be easily taken away by reducing agents like coke.

What is alumina? Write its molecular formula.

Description : What is alumina? Write its molecular formula.

Last Answer : Alumina is chemically hydrated oxide of aluminium. Its formula is Al2O3.2H2O.

What is a mordant?

Description : What is a mordant?

Last Answer : A mordant is a substance which helps to bind the dye to the cloth.

Mention the uses of aluminium salts.

Description : Mention the uses of aluminium salts.

Last Answer : a) Aluminium salts are used as mordant in textile industry (to bind the dye to the cloth). b) Potash alum is used to prevent bleeding from small cuts by coagulating the blood at the surface.

Name the impurities present in cast iron. How can these impurities be removed?

Description : Name the impurities present in cast iron. How can these impurities be removed?

Last Answer : Cast iron contains sulphur, phosphorous, silicon and carbon. The impurities present in the blast furnace can be removed by using Bessemer converter, open hearth process or electric furnace.

Mention the uses of cast iron.

Description : Mention the uses of cast iron.

Last Answer : Cast iron is used for: a) Making stands for wooden benches and desks. b) Making dosa pan c) Making lid for covering manholes of sewage system. d) Making machinery parts.

How is the slag obtained in the extraction of iron useful?

Description : How is the slag obtained in the extraction of iron useful?

Last Answer : Slag obtained in blast furnace is used as one of theraw materials of glass and cement.