ONLINE PRACTICE TEST FORCLASS 10 CHEMISTRY AND SOME BASIC CONCEPTS
online practice test for class 10
<a herf="https://www.scholarslearning.com/cbse/class-xi/science/chemistry/test">Importance and Scope of Chemistry</a> *) Increase in the production of food -Through use of chemical fertilizer, insecticides, fungicides and pesticides. #)Contribution to better health and sanitation through use of life saving drugs,e.g , cisplatin and taxol for cancer and AZT for AIDS and also through the use of analgescis,antibiotics ,tranquilizers, antiseptics,disinfectants, insecticides and anaesthetics. #) saving the environment by use of environment friendly chemicals. #)Increase in comfort and luxury by use of synthetic fibres,building materials,metals like iron aluminium,copper,silver gold etc.and articles of domestic use like soaps,detergents,paper,glass,plastics,etc. #)Transport which involves use of petrol and diesel and other high quality fuels for aeroplanes etc. #)Application in industries like glass,paper,cement,textiles,paints etc. #)Negative role of Chemistry Chemical fertilizers,insecticides etc.used for better yield of the crop have bad effect on health.Polythene bags cause serious threat to serverage.LSD ,cocaine ,brown sugar etc are a curse for humanity.Atom bomb is a big tool of destruction. #) Matter - It is defined as anything that occupies space,possesses mass and the presence of which can be felt by any of our senses. #)Physical classification of matter.(I) Solid which has definite volume and definite shape (ii) Liquid which has definite volume but no definite shape (iii) Gas which has neither definite shape nor definite volume. A substance which is liquid at room temperature, irmts gaseous from at higher temperature is called vapor. <a herf="https://www.scholarslearning.com/cbse/class-xii/science/chemistry/test">Chemical classification of matter</a> A) Homogeneous and heterogeneous. If composition and properties of a material are uniform throughout, it is called homogeneous. It consists of only one phase. If a material contains a number of phases, it is called heterogeneous. B)Elements,Compounds and Mixtures. An element is the simplest form of a pure substance which can neither be divided into nor built up from simpler substances. It contains only one kind of particles which may be atoms or molecules. A compound is a pure substance containing two or more than two elements combined together in a fixed proportion by mass. It can be decomposed into its constituent elements by chemical method. Its properties are completely different from its constituent elements. A mixture is a material consisting of two or more substances in any proportion. Its properties are those of its constituents. It can be separated into its constituents by simple physical methods. A mixture may be homogeneous or heterogeneous.
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