Review balancing equations by watching an example involving photosynthesis. (i) Lead nitrate reacts with sulphuric acid to form a precipitate of lead sulphate and nitric acid. (iii) 2Al(s) + 6HCl (aq) + 2AlCl3(aq) ➝ 3H2(g), Question 20. Photosynthesis: It is the process by which green plants manufacture food by using carbon dioxide and water in the presence of sunlight. (d) 2H2 + O2 → 2H2O 2Mg + O2 → 2MgO + Light Topics and Sub Topics Covered in NCERT Solutions for Class 10 Science Chapter 1. Question 4. Answer: (iv) BaČl2 + ZnSO2 → ZnCl2 + BaSO4. Gujarat Board Class 10 Science Chemical Reactions and Equations Textbook Questions and Answers. Product: New substance formed after a chemical reaction is called a product. Effects of Oxidation Reactions in Everyday life: Corrosion and Rancidity. Identify X and also write the chemical reactions involved. What happens when a piece of: AgNO3 + HCl → AgCl + HNO3 (iii) Fill the vessel with water such that the electrodes are immersed. (iii) Change in state of substance: The combustion reaction of candle wax is characterised by a change in state from solid to liquid and gas (because the wax is a solid, water formed by the combustion of wax is a liquid at room temperature whereas, carbon dioxide produced by the combustion of wax is a gas). Which of the following statements about the reaction below are incorrect? (b) H2O + F2 → HF + HOF Zigya App . Copper is more reactive than silver. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) ↑. When quick lime (CaO) is added to water, it releases energy. (ii) Name the products formed on strongly heating ferrous sulphate crystals. Here we have given NCERT Class 10 Science Notes Chapter 1 Chemical Reactions and Equations. Oxygen is the only common gas that relights the splinter and hydrogen gas burns with a pop. Identify the substance oxidised, substance reduced, oxidising agent and reducing agent: (ii) Insert carbon electrodes in these rubber Plastic mug stoppers and connect these electrodes to a 6 volt battery and a switch. KCl(aq) + AgNO3(aq) → AgCl(s) + KNO3(aq) Question 4. Grapes when attached to the plants are living and therefore, their own immune system prevents fermentation. CBSE Class 10 Science Notes Chapter 1 Chemical Reactions and Equations Pdf free download is part of Class 10 Science Notes for Quick Revision. A chemical equation can be divided into two types: Balanced Chemical Equation and Unbalanced Chemical Equation. Question 8. No, double displacement reaction takes place when there is a formation of a slightly soluble salt. Question 11. If so, the equation is balanced. Chemical Equation for Photosynthesis. Answer: The physiological process being studied is Photosynthesisii. (A) 6CO₂ + 12H₂O + (light energy) → C₆H₁₂O₆ + 6O₂ + 6H₂O (B) CO₂ + 12H₂O + (light energy) → C₆H₁₂O₆ + O₂ + 6H₂O (C) 6CO₂ + H₂O + (light energy) → C₆H₁₂O₆ + 12O₂ + 126H₂O (D) 12CO₂ + H₂O + … (iii) Zn(s) + H2SO4 (aq) + ZnSO4(x) + H2 (y) Question 16. Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Give the characteristic tests for the following gases: Ag(s) + CuSO4 (aq) → No reaction, Question 5. This is a chemical reaction which involves emission of visible light. Question 24. (i) The light factor is being studied in this experiment. Why is the combustion of Liquified Petroleum Gas (LPG) a chemical change? Question 1. (d) Chemical change Addition of oxygen to a substance is called Oxidation, so hydrogen is being oxidised to water. (ii) 2Mg + O2 → 2Mgo Therefore, it is an unbalanced chemical equation. Redox reaction: Chemical reaction in which both oxidation and reduction take place simultaneously. How opening and closing of stomata is regulated? Fe + 4 × H2O → Fe3O4 + 4 × H2 Answer: Write the number of atoms of elements present in reactants and in products in a table as shown here. Question 4. ZnCO3 + Heat → ZnO + CO2. How to balance a chemical equation . (i) Name the substance which is getting oxidised. The compound or element which goes under reduction in called to be Reduced. Basic raw materials for photosynthesis In this equation, A and B are called reactants and C and D are called the products. This means that the total mass of elements in the products of a chemical reaction has to be equal to the total mass of the elements in the reactants. (ii) Write the balanced chemical equation when X is dissolved in water. Identify the mistake and balance the equation. Reactant: Substances which take part in a chemical reaction are called reactants. In this reaction, carbon is combined with oxygen. Photosynthesis - Provider of Food For All. When magnesium is burnt in the air (oxygen), magnesium oxide is formed. Question 25. (ii) will not take place. So, this reaction is an exothermic reaction. (i) Take a plastic vessel. In this reaction, magnesium is combined with oxygen. (ii) 2Na(s) + 2H4O(l) → 2NaOH(aq), Question 7. Magnesium + Oxygen → Magnesium Oxide, When carbon is burnt in oxygen (air), carbon dioxide is formed. Writing the condition in which reaction takes place: The condition is generally written above and/or below the arrow of a chemical equation. Condition, if any, is written generally above the arrow. (a) Fe2O3(s) + 2Al(s) + AI2O3(s) + 2Fe(l) + Heat Displacement reaction Example: (v) Oxidation and Reduction Reactions: This formula could also be read as: Glucose + oxygen –> water + carbon dioxide + energy. For example: Rusting of iron, the setting of milk into curd, digestion of food, respiration, etc. Write the equation for the reaction which takes place. Balancing Chemical Equations Problems #1 - 10. (v) NaOH solution, Question 6. (ii) O2 It reacts with water to form calcium hydroxide which is basic in nature. Answer: (iii) Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated H2SO4. (ii) The plant was kept in a dark room to destarch its leaves. Why is photosynthesis considered an endothermic reaction ? According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks. Answer: To balance it, one needs to multiply the hydrogen on the RHS by 4. To Make Equations More Informative: (ii) The substance getting reduced is CuO. Question 18. Only a rearrangement of atoms takes place in a chemical reaction. Identify the brown gas ‘X’. There is one atom on the left and one on the right, so there is nothing to balance yet. (a) Physical change (i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube ? 2H2S + SO2 ➝ 2H2O + 3S ↓. Answer: Question 15. Write the balanced equation of photosynthesis. Question 2. Answer: Magnesium ribbon should be cleaned before burning in air so that we wanted impurities are removed and we bum only pure magnesium … Consider the chemical equation given below and answer the questions that follow: Question 29. Give one example of a reaction which is a double displacement reaction as well as a precipitation reaction. Photosynthesis: The physical-chemical process by which certain chlorophyll (containing organisms use light energy for the biosynthesis of organic molecules. (vi) Cuo. (iv) Name the reducing agent. Mg + 2HCl → MgCl2 + H2 Combustion of Liquified Petroleum Gas (LPG) is a chemical change because, after its combustion, a new substance is formed and cannot be turned back into LPG. Solid calcium oxide was taken in a container and water was added slowly to it Answer: Chemical equations were first formulated in the year 1615 by a French chemist Jean Beguin. Question 19. Therefore, no reaction occurs. Question 22. A chemical equation is a common term of day to day chemistry. (v) Switch on the current. Examples: Class 10 Class 12. Name the phenomenon involved. (iv) V2O5 + 5Ca → 2V + 5Cao (ii) The temperature of the reaction mixture rises when aluminium is added because it is an exothermic reaction. Reduction: Addition of hydrogen or metallic element or removal of oxygen or non-metallic element from a compound is called Reduction. There are … (b) Dilution of sulphuric acid In black and white photography, the chemical Silver Bromide (or AgBr), which is a photosensitive compound, when exposed to sunlight or white light of any form and origin decomposes, and then forms Silver metal and Bromine gas.. Photosynthesis process can be represented by a chemical equation. All questions and answers from the Lakhmir Singh Manjit Kaur (chemistry) Book of Class 10 Science Chapter 1 are provided here for you for free. Translate the following statements into chemical equations and balance them: Write a balanced equation for these reactions Answer: Photosynthetic Membrane: A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical … (i) Silver being a less reactive metal than hydrogen does not displace hydrogen from HCI. Under what conditions do these grapes ferment? How does this colour change after heating ? The first part of the chapter, Chemical Reactions and Equations focuses on the concept of chemical equations. (i) Indicating physical state of reactants and products. 8. (i) A yellow precipitate of lead iodide (PbI,) is formed. Chemical Reaction: The transformation of chemical substance into another chemical substance is known as Chemical Reaction. (e) Physical change. When zinc reacts with hydrochloric acid, it gives hydrogen gas and zinc chloride. A general displacement reaction can be represented by using a chemical equation as follows : Question 3. (iv) Give a balanced chemical equation to represent the process of photosynthesis. To obey this law, the total mass of elements present in reactants must be equal to the total mass of elements present in products. CBSE Class 10 Science Notes Chapter 1 Chemical Reactions and Equations Reducing agent : HCl. Balanced Chemical Equation For Photosynthesis Video Lesson. (iv) Hydrogen (H2 gas burns with a pop sound when a burning candle is brought near it. Example: Rusting of iron. Answer: (iii) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide. The substance which gives hydrogen for reduction is called a Reducing agent. Equation 6 CO 2 + 6 H 2 O → C 6 H 12 O 6 + 6 O 2 Why will the colour of heated copper powder become black when air is passed over it? Is oxidation an exothermic or an endothermic reaction ? (b) Magnesium oxide is an oxide of a metal, so, it is basic in nature. This chemical equation is the structural chemical equation of the reaction. (b) 3Mg(s) + N2 (g) → Mg3 N2(s) Combination reaction These solutions for Chemical Reactions And Equations are extremely popular among Class 10 students for Science Chemical Reactions And Equations Solutions come handy for quickly completing your homework and preparing for exams. Example: Mg and O2. Question 3. Question 33. (c) Silver metal being less reactive than copper cannot displace copper from its salt solution. What is wrong with the following equation? When magnesium is exposed to air, it reacts with oxygen to form a layer of magnesium oxide. The chemical reaction between sulphur dioxide gas and acidified potassium dichromate solution is characterized by a change in colour from orange to green. Examples: On the other hand, copper (Cu) cannot displace iron (Fe), so reaction, Question 28. To balance it, multiply the iron on the LHS by 3. (i) X is MgO; Y is Mg3 N2 Balanced Equations. Translate the following statements into chemical equations and then balance the equations : The observations of the activities mentioned determine whether a chemical reaction has taken place. (ii) Precipitation reaction/Double displacement reaction. (vi) CuO + H2 → Cu + H2O Answer: What is the difference between the following two types of reactions ? (ii) 3BaCl, + AI2(SO2) → 2AICI3 + 3BaSO4 (v) Formation of precipitate: The chemical reaction between sulphuric acid and barium chloride solution is characterised by the formation of a white precipitate of barium sulphate. (i) Following are the two observations : On adding dilute HCl to copper oxide powder, the soluton formed is blue green. (ii) Displacement reaction, (vi) After sometime, you will observe the formation of bubbles at both the electrodes. Chemical Reactions And Equations Class 10 Essential Questions Science Chapter 1 – Learn Cram. (e) Sublimation of solid ammonium chloride Answer: Why do we store silver chloride in dark coloured bottles ? Answer: Basic raw materials for photosynthesis When CO2 gas is passed in excess through lime water, milkiness disappears due to formation of soluble calcium hydrogen carbonate. A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. (i) Silver metal does not show any change. (c) Fe2O3 + 3CO → 2Fe + 3CO2 (b) NaHCO3 + HCl + NaCl + H2O + CO2 Steps to balance chemical equation (1) Write down the chemical reaction in the form of word equation,keeping reactants on left hand side and products on right hand side. Cu + HCl → No reaction. CBSE Class 10 Science Book Chapter 1 “Chemical Reactions and Equations” Multiple Choice Questions (MCQs) with Answers. (i) Pb3O4 + 8HCl → 3PbCl2 + Cl2 + 4H2O Question 2. 2PbO(s) + C(s) → 2Pb(s) + CO 2 (g) (a) Lead is getting reduced. (iii) The reaction of sodium metal is found to be highly explosive. Corrosion of Copper: Copper objects lose their lustre and shine after some time because the surface of these objects acquires a green coating of basic copper carbonate, CuCO3.Cu(OH)2 when exposed to air. Which among the following are physical or chemical changes ? (i) Fe + CuSO4 → FeSO4 + Cu Question and Answer forum for K12 Students. The substance which removes oxygen is also called a Reducing agent. Rancidity: The taste and odour of food materials containing fat and oil changes when they are left exposed to air for a long time. (i) Combination reaction. There are some chemical reactions which can show more than one characteristics. ... How would you prove that breaking down of ozone layer and the process of photosynthesis are Chemical changes Asked by Nimmi 9th November 2018 3:32 PM . What is meant by the skeletal equation? Answer: Question : Solutions of Questions on Page Number : 6 Q1 :Why should a magnesium ribbon be cleaned before it is burnt in air? Question 13. (iv) Give a balanced chemical equation to represent the process of photosynthesis. (i) Formation of new substance(s) Answer: In other words, the number of atoms of each element remains the same, before and after a chemical reaction. (iv) Barium chloride reacts with zinc sulphate to give zinc chloride and barium sulphate. Balance the atom which is maximum in number on either side of a chemical equation. This is called Rancidity. Write the balanced chemical equations for the following reactions : Photosynthesis is the physico-chemical process by which plants can convert light energy into chemical energy, in the form of carbohydrate from simple inorganic substances like atmospheric carbon dioxide and water. (d) Ethanol is burnt in air to form carbon dioxide, water and releases heat. (ii) 2Al + Fe2O3 → AI2O3 + 2Fe Explain why. Question 30. Click hereto get an answer to your question ️ Write the balanced chemical equation for the process of photosynthesis. It is caused due to the oxidation of fat and oil present in food materials. Effects of Oxidation Reactions in Our Daily Life: We hope the given CBSE Class 10 Science Notes Chapter 1 Chemical Reactions and Equations Pdf free download will help you. So, if all the coefficients can be divided by 2 or 3, do this before finalizing the reaction. By writing the physical states of substances, a chemical equation becomes more informative. Corrosion: The process of slow conversion of metals into their undesirable compounds due to their reaction with oxygen, water, acids, gases etc. Precipitation Reaction: The reaction in which precipitate is formed by the mixing of the aqueous solution of two salts is called Precipitation Reaction. Answer: A copper coin was kept dipped in silver nitrate solution for a few hours/ days. Characteristics of Chemical Reactions : ZnO is reduced to Zn—reduction. It is a thermal decomposition reaction. (ii) x – 2Ag (b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride. BaCl2(aq) + H2SO4(aq) → BaSO4(s) (ppt) + 2HCl(aq). (iii) x – (aq); y – (g) “An aqueous solution of ferrous sulphate reacts with an aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in solution.” Question 3. Answer: (b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide. Chlorophyll of the leaves of the plant trap sunlight and converts them into chemical energy during photosynthesis. This is a chemical change. You will also love … Name the type of chemical reaction represented by the following equation: The chemical equation in the light reaction of photosynthesis can be reduced to: 2H 2 O + 2NADP+ + 3ADP + 3Pi → O 2 + 2NADPH + 3ATP Dark Reaction of … According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks. The chemical reaction between zinc granules and dilute sulphuric acid is also characterised by a change in temperature (which is a rise in temperature). Answer: (a) Na2CO3 + HCl → NaCl + NaHCO3 Dec 31,2020 - Balanced equation for photosynthesis? In this example, a number of atoms of elements are not equal on two sides of the reaction. The process of making the number of different types of atoms equal on both side of an equation is called balancing equation. (v) What type of a reaction does this equation represent ? Substance reduced : MnO2 10. The response is precipitation reaction. 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