Express the following in scientific notation: i 0. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. A mixture contains two or more substances present in it in any ratio which are called its components. Air is an example of a mixture Mixtures are of two types, homogeneous and heterogeneous. M o larity of the solution is defined as the number of moles of solute dissolved per litre dm 3 of the solution. Thus, these Chapter-wise Class 11 Physics Notes ensures maximum preparation and good marks in the examination.
An element consists of only one type of particles. These are stated below: a All non-zero digits are significant. The uncertainty is indicated by writing the certain digits and the last uncertain digit. Important compounds of Silicon and a few uses: Silicon Tetrachloride, Silicones, Silicates and Zeolites, their uses. Volume has the units of.
If mass of air at sea level is 1034 g cm -2,calculate the pressure in pascal. In case of even figure, the preceding digit remains unchanged. It is expressed as 'x'. Sugar solution and air are thus, the examples of homogeneous mixtures. Calcium Oxide and Calcium Carbonate and their industrial uses, biological importance of Magnesium and Calcium.
These properties can be classified into two categories — physical properties and chemical properties. In 1811, Avogadro proposed that equal volumes of gases at the same temperature and pressure should contain equal number of molecules. Inter molecular space Very small Slightly greater Very great 7. Molecules are classified as homoatomic and heteroatomic. Thus, you are given individual attention which means the maximum benefits can be reaped and your success at the examination is assured. Shape Definite Indefinite Indefinite 3. How does molality depend on temperature? When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
Sodium, copper, silver, hydrogen, oxygen etc. The components of a mixture can be separated by using physical methods such as simple hand picking, filtration, crystallization, distillation etc. To express it more accuratelywe express it with digits that are known with certainty. Organiccompounds are those, which occur in living sources such as plants and animals. Atomic Mass Atomic mass of an element is defined as the average relative mass of an atom of an element as compared to the mass of an atom of carbon -12 taken as 12.
Molecular mass expressed in grams is called gram molecular mass Formula Mass: Sum of atomic masses of all atoms in a formula unit of the compound 33. Gram Molecular Mass A quantity of substance whose mass in grams is numerically equal to its molecular mass is called gram molecular mass. Thus, if we write a result as 11. This subject has a tendency to challenge a student at every step and thus, students are required to put in continuous efforts and rigorous practice are required by the students to score maximum marks in the examinations. Atomic Mass Unit One atomic mass unit is defined as a mass exactly equal to one twelfth the mass of one carbon -12 atom. Anything which has mass and occupies space is called matter. It is important that students prepare well before their examinations because this sets the base for their 12th boards.
Te mp er ature--There are three common scales to measure emperature — °C degree celsius , °F degree Fahrenheit and K kelvin. Compounds A compound is a pure substance made up of two or more elements combined in a definite proportion by mass, which could be split by suitable chemical methods. Thus, hydrogen, nitrogen and oxygen gases consist of molecules in which two atoms combine to give their respective molecules. The decimal place does not determine the number of significant figures. Alkenes - Nomenclature, structure of double bond ethene , geometrical isomerism, physical properties, methods of preparation, chemical reactions: addition of hydrogen, halogen, water, hydrogen halides Markownikov's addition and peroxide effect , ozonolysis, oxidation, mechanism of electrophilic addition.
Thus, we can write in scientific notation. Calculate the number of moles in each of the following. Elements are further classified into metals, non-metals and metalloids. Hence, the answer should have 3 significant figures. One mole of all gaseous substances at 273 K and 1 atm pressure occupies a volume equal to 22. Hence, B is the limiting reagent. It isdenoted by the symbol M.
Pressure is determined as force per unit area of the surface. These mixtures have visible boundaries of separation between the different constituents and can be seen with the naked eye e. Revising notes in exam days is on of the best tips recommended by teachers during exam days. The revision notes help you revise the whole chapter in minutes. Dimensional Analysis During calculations generally there is a need to convert units from one system to other. A mole represents a collection of 6. He observed that when gases combine or are produced in a chemical reaction they do so in a simple ratio by volume provided all gases are at same temperature and pressure.