1. What is the dufference between physical change & chemical change?
2. What is balanced chemical equation?. Give example.
3. Define and give example -
(i) oxidation reaction
(ii) reduction reaction
4. What is redox reaction? Give example.
5. What is precipitation?
6. Difference between exothermic & endothermic reaction.
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Answers
Explanation:
1. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
2. A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.
3. Oxidation reaction: The reaction in which oxygen is gained or hydrogen is lost, is called oxidation reaction. e.g. 2Cu+O2heat 2CuO. Reduction reaction. The reaction in which hydrogen is gained or oxygen is lost, is called reduction reaction. e.g., CuO+H2heat Cu+H2O.
4. An oxidation-reduction reaction is any chemical reaction in which, by obtaining or losing an electron, the oxidation number of a molecule, atom, or ion varies. An example of a redox reaction is the formation of hydrogen fluoride. To study the oxidation and reduction of reactants, we should break the reaction down.
5. Precipitation is any liquid or frozen water that forms in the atmosphere and falls back to the Earth. It comes in many forms, like rain, sleet, and snow. Along with evaporation and condensation, precipitation is one of the three major parts of the global water cycle
6. In an easy way, the endothermic reactions absorb energy from the surrounding, which is in the form of heat. Whereas, an exothermic reaction releases the energy into the surrounding of the system. Photosynthesis is a popular example of an endothermic chemical reaction.
Answer:
A1) Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
A2) A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia.
A3) Oxidation reaction: The reaction in which oxygen is gained or hydrogen is lost, is called oxidation reaction. e.g. 2Cu+O2heat 2CuO. Reduction reaction. The reaction in which hydrogen is gained or oxygen is lost, is called reduction reaction. e.g., CuO+H2heat Cu+H2O.
A4) An oxidation-reduction reaction is any chemical reaction in which, by obtaining or losing an electron, the oxidation number of a molecule, atom, or ion varies. An example of a redox reaction is the formation of hydrogen fluoride. To study the oxidation and reduction of reactants, we should break the reaction down.
A5) In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzling, rain, sleet, snow, ice pellets, graupel and hail.
A6) A chemical reaction that releases energy, usually in the form of heat. ... An exothermic reaction releases energy and feels warm while an endothermic reaction absorbs energy and feels cool.
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