Punjab Textbook Board Books Pdf
Free download or read online Physics Metric 9th Class Book in English Textbook Punjab Board Authored by Prof Tahir Hassan and Prof Muhammad Nadeem Anwar. This PDF literature has been selected and published by Government of Punjab for the academic year 2016-2017. This book reading and learning for all govt school in Punjab province. Pdf book: inter part-1, fsc physics book (grade 11), punjab textbook board lahore January 16, 2018 10th class notes, 1st year physics notes, 9 class notes, 9th class paper scheme 2018, fsc 1st year physics book, fsc 1st year physics book pdf, fsc notes, math city, mathcity, Phycity.
Ans: Bohrs atomic model:- Neil bohr proposed a new model for the structure of the atom in 1913.The salient features of this model are that. 1) Electron revolve around the nucleus in fixed circular paths which he called orbit or energy level. 2) As long as an electron revolve in a particular energy level it does not emit or absorb energy. 3) When an electron absorb energy it moves to a higher energy level further away from the nucleus. When it lose energy it return to lower energy level closer to the nucleus & the energy is emitted as light. 4) The electron loses a definite quantity of energy called quantum of energy when it jump down from an orbit of higher energy level to a lower energy level. The energy is emitted in the form of radiation.
H2+Cl22HCl Q:2) How aluminum is extracted from its ore. Give its physical and chemical properties? Ans) Preparation:- It is prepared industrially by a process called the hall beroult process. Purification of ore:- naturally occurring bauxite contain impurities like silica and oxides of iron. The first step is obtained aluminum therefore involves the purification of the mineral.
It decomposes to form CaO and carbon dioxide.CaO react with the gangue(mostly silica and some alumina)to form their respective salts. They are known as slag. The slag floats as the molten iron and is run off which molten iron is seen into sand moulds where it cools down to solid blocks called pig iron. Q2) what is rusting? Ans) rusting of iron:- when an iron is exposed to air and moisture its surface is gradually corroded and converted into a brown mass. This brown mass is known as rust. Q3)how is rusting controlled by the catholic protection and electroplating?
Ans: Electrolysis: The substance which allow electricity to pass through their solution and are chemical decompose are called “electrolysis.” example: acid,base,salt Non-electrolysis:-” These substances which do not dissociate into ions when dissolved in water and do not induct electricity are known as non-electrolysis.” example:sugar,solution,benzene. Strong electrolysis:-Those electrolysis which are highly dissociated and can conduct large current are known as “strong electrolysis”. Example: HCl, NaOH Weak electrolysis:Those electrolysis which are poorly dissociated and can conduct poor current are known as” weak electrolysis”. Example: acetic acid, mercuric chloride Q4)Define electrolysis?
Cara instal driver canon mp258 di windows 7. 3:They are usually insoluble in water. 4: They can conduct electricity. 4: They cannot conduct electricity.
Q2) What are transition element write four properties of them? Ans: Transition element: Element of group IB, IIB, through VIIB are known as transition element. They include the element scandium, yttrium, thanum and actinium and the two rare-earth series of element the lanthanide and actinide series. Properties: (1) These element have incomplete inner electron shell. (2) All transition element are metal. (3) The bond between the atom are very strong and they have melting points. (4) These compound are formed by coordinate covalent bond.
Ans: Chemical reaction are of following types: 1: Simple decomposition:-In this reaction a single compound is decomposed into two or more simple substance. 2: Synthesis:-In this reaction two or more substance combine to from a single compound it is also known as addition reaction. 3: Displacement:-In this reaction an atom or radical displaced by another in a compound. Such reaction depend upon the electropositive or electronegative nature of an atom or radical to displaced another. 4: Double decomposition / displacement:-In this reaction the two reactants decomposed to form two new substances by exchanging their radicals. 5: Neutralization:-In this reaction, the hydrogen ion of an acid neutralized by the hydroxide ion of a base to from salt and water.
2) It is used in paper industry. 3) It is used in the refining of petroleum and oils. CHAPTER 9 – IRON, COPPER, ZINE AND LEAD Q1) How is iron manufacture by blast furnace? A)extraction of iron: iron metal is gradually extracted from its oxide ores by reducing them with carbon in the from of coal and coke.
It has one proton and two neutron in the nucleus and one electron revolve in the k shell. It has radio active form of hydrogen. Q4) How is sodium hydroxide manufactured electrolytically. Give its important application.
Let us observe whether these ratios are simple multiple to each other or not following mathematical operation is carried out. 8:3::16:2 8/3: 16/2 or 8/3 x 2/16 or 1/3 => 1:3 CHAPTER 3- WATER AND SOLUTION Q1) Define solubility what are the factors which can affect solubility? Ans: Solubility:-“The solubility of a solute in a solvent at a particular temperature is the number of grams of solute necessary of saturate 100g of the solvent at that temperature.” Factore of solubility 1)Temperature:-it is often observed solubility of many solute the solution generally increases in temperature for example, the solubility of potassium mitrate increases with temperatures the solubility of some solute decreases with the increase in temperature such solute generally heat when dissolved in water for example, calcium oxide is less soluble in hot water than in the cold state. Gases are also more soluble in cold solvent than in hot solvent. 2) Pressure:-Solubility of gases increases with the increase in pressure. Carbon di oxide in filled in soda water bottles pressure. 3) Nature of the solute and the solvent:-The solubility of polar compound is more in polar solvent and that of non-polar solvent in non-polar solvent.
All chemical bond between atoms are formed by utilizing the electron of outer most shell generally the atoms combine with are another in there way. 1) By using electron. 2)By gaining the electron.
But aluminum powder decompose water at 100C liberating and forms. REACTION WITH ALKALIS:-Aluminum react vigorously with strong alkalis eg to form aluminates along with hydrogen. Q3) What are isotopes? Describe the isotopes of hydrogen?
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6: Hydrolysis:-In this reaction the salt of either weak acid and base dissolve in water to from acid and base. Q4:Explain Laws of Chemical Combinations with example. Ans: Laws of Chemical Combinations There are four laws of chemical combinations these laws explained the general feature of chemical change. These laws are: 1. Law of Conservation of Mass 2. Law of Definite Proportions 3.
Ans:Dalton atomic theory:-The fundamental postulates of Dalton atomic theory are stated below: 1) Matter is composed of extremely tiny invisible particles called atom. 2) Atom can neither be created or destroyed.
Software download windows 10. C+O2CO2 Q2: state exothermic and endothermic reaction with examples? Ans: exothermic reaction:-Reaction in which heat energy is evolved is known as exothermic reaction in such reaction the system become warmer and neat potential energy of substances decreases.
Punjab Textbook Board Books Free Download
Trend of I.E in Period Ionization energy increases from left to right in a period due to increase in nuclear change and decrease in atomic size. Trend of I.E in Group I.E decreases from top to bottom in a group due to increase in atomic size. Electro negativity Definition The tendency of each atom in a covalent molecule to attract a shared pair of electrons towards itself is known as its electro negativity. Factors Affecting Electro negativity Electro negativity depends upon the following factors: Atomic size Atomic Number Electron Affinity Ionization Energy Trend or Variation in the Period Electro negativity increases from left to right within a period due to increase in nuclear charge and decrease in atomic size. Trend or Variation in the Group Electro negativity values decreases from top to bottom within a group due to increase in atomic size. Electron Affinity Definition The energy change that occurs when an electron is gained by an atom in the gaseous state is known as Electron Affinity.