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06.06.2021, adminIt covers the topic of Chemistry which covers the idea of chemicals. The topics which are covered in this chapter are Chemical equation, Balanced chemical equation, implication of a balanced chemical equation, types of chemical reactions: Combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.
These are based on the latest pattern of CBSE. Overall, the chapter Chemical Reactions and Equations will help the students in their examination. Chapter 1 Chemical Reactions and Equations Questions and answers are quite beneficial for scoring good marks in the exams and prepare your answers by taking help. These NCERT Solutions are helpful resources that can help you not only cover the entire syllabus but also provide in depth analysis of the topics.
Why is the amount of gas collected in one of the test tubes in Activity 1. Name this gas. Give an example of a rdactions displacement reaction other than the one given in Activity 1. Which of the statements about the reaction below are incorrect? Page No: 15 3. What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer. NCERT Solutions for 10th ncert chemical reactions and equations answers mod 10 are helpful resources that can help you not 10th ncert chemical reactions and equations answers mod cover the entire syllabus but also provide in xhemical analysis of the topics.
It will help you in analyzing the problems and answering it with precision. 10th ncert chemical reactions and equations answers mod the law which is kept in mind while we balance a chemical equation. Law of conservation 10gh mass. Mass can neither be created nor be destroyed during a chemical reaction. What is basic difference between a physical change and a chemical change? In a physical change, no new substance is formed.
In a chemical change, new substance is formed. What is meant by a chemical reaction? A process in which two or more substances react to form some other new substances with new set of properties is called a chemical reaction. Is burning of a candle, a physical change or a chemical change?
Burning of candle is both chemical change and physical change. Why are decomposing reactions called the opposite of combination reactions?
In combination reactions, two substances combine to form one compound and in decomposition reactions, a compound breaks down into two or more substances, so they are opposite to each. Previous Post Next Post.
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Ques 3: Write a balanced chemical equation with state symbols for the following reactions i Solutions of Barium chloride and Sodium Sulphate in water react to give insoluble Barium Sulphate and solution of Sodium chloride.
Ques 2: Why is the amount of gas collected in one of the test tubes in Activity 1. Name this gas. Ques 1: Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Ques 2: Give an example of a double displacement reaction other than the one was given in Activity 1.
Ques 3: Identify the substances that are oxidized and that are reduced in the following equation. Ques 1: Which of the statements about the reaction below are incorrect?
Combination reaction. Double displacement reaction. Decomposition reaction. Displacement reaction. Ques 3: What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer. Hydrogen gas and Iron chloride are produced.
Chlorine gas and Iron hydroxide are produced. No reaction takes place. Iron salt and water are produced. Ques 4: TWhat is a balanced chemical equation?
Why should a chemical equation be balanced? Ques 5: Translate the following statements into chemical equations and balance them. Ques 6: Balance the following chemical equations. Ques 7: Write the balanced chemical equation for the following reactions. Ques 8: Write a balanced chemical equation for the following and identify the type of reaction of each case I.
Ques 9: What is meant by exothermic and endothermic reactions? Give examples. Ques Why are decomposition reactions called the opposite of Combination reactions? Write equations for decomposition reactions. Therefore, the amount of hydrogen and oxygen produced during electrolysis of water is in a ratio. During electrolysis, since hydrogen goes to one test tube and oxygen goes to another, the amount of gas collected in one of the test tubes is double of the amount collected in the other.
Why does the colour of copper sulphate solution change when an iron nail is dipped in it? When an iron nail dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than copper.
Therefore the colour of the copper sulphate solution changes. The reaction is:. Give an example of a double displacement reaction other than the one given in Activity 1. Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride. In this reaction, sodium carbonate and calcium chloride exchange ions to form two new compounds.
Hence, it is a double displacement reaction. Identify the substances that are oxidized and that are reduced in the following equation.
Which of the statements about the reaction below are incorrect? Explanation: a because Oxygen is being removed and b because the removed oxygen from Lead is added to the 10th Ncert Chemical Reactions And Equations Answers You elemental Carbon. The above reaction is an example of a.
Answer is 4. Displacement reaction. In this reaction Aluminum is more reactive metal than Fe. Therefore Al will displace Fe from its oxide. This type of chemical reactions in which one of the elements displace another is called displacement reaction. Here less reactive metal is displaced by more reactive metal. Since one-time displacement is occurring, therefore, it is called a single displacement reaction. What happens when dilute hydrochloric acid is added to iron fillings?
Tick the correct answer. Hydrogen gas and Iron chloride are produced. Explanation: The Chlorine from Hydrogen chloride is displaced by the Iron fillings to undergo the following reaction. Question 4. What is a balanced chemical equation? Why should a chemical equation be balanced? An equation for a chemical reaction is an equation in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
In other words, the mass and the charge are balanced on both sides of the reaction. Balancing chemical equation is necessary for the reaction should obey The Law of Conservation of energy. Question 5. Translate the following statements into chemical equations and balance them. Question 6. Balance the following chemical equations. Question 7. Write the balanced chemical equation for the following reactions.
Question 8. Write a balanced chemical equation for the following and identify the type of reaction of each case. Question 9. What is meant by exothermic and endothermic reactions? Give examples. An exothermic reaction is one in which energy is released from the system into the surroundings. Example: Explosions, concrete setting, nuclear fission and fusion. Why is respiration considered to be an exothermic reaction? During respiration, glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy.
It is an exothermic reaction, because energy is produced during this process. Question Why are decomposition reactions called the opposite of Combination reactions? Write equations for decomposition reactions. Decomposition reactions are those in which a compound breaks down to form two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy.
Since heat had to be added to make this reaction occur, it is an endothermic reaction. Most decomposition reactions are endothermic.
Examples of decomposition reactions are:. Write one equation each for decomposition reactions in which energy is supplied in the form of heat, light or electricity. The reaction in which a compound is decomposed by heating it to a high temperature is called thermal decomposition. Decomposition of potassium chlorate: When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen.
This reaction is used for the preparation of oxygen. Decomposition of hydrogen peroxide: In the presence of light, hydrogen peroxide decomposes into water and oxygen. What is the difference between displacement and double displacement reactions? Write relevant equations for the above. The difference between the displacement and double displacement reactions is that in a displacement reaction one element displaces another by virtue of it being more reactive whereas in a double displacement two anions and two cations switch places between two compounds respectively.
For example displacement reaction :. Thus Zn displaces Cu in the salt form. Zn is more reactive than Cu. An example of double displacement reaction is the reaction between sodium carbonate and calcium chloride, both in aqueous Solution:. In the refining of Silver, the recovery of silver from Silver nitrate solution involves displacement reaction by Copper metal.
Write down the reaction involved. What do you mean by a precipitation reaction? Explain by giving examples. When two solutions containing soluble salts are combined, a double displacement reaction takes place in which the ions are exchanged between the compounds. When one of such compounds formed is in solid form that is insoluble in aqua then it settles down at the bottom of the container.
This solid is known as the precipitate and the respective reaction is termed as the precipitation reaction. Examples of precipitation reactions are:. Explain the following in terms of gain of oxygen with two examples each. The shiny brown coloured element X is copper metal Cu. When copper metal is heated in air, it forms a black coloured compound copper oxide. So, the black coloured compound is copper oxide or copper II oxide, CuO.
Why do we apply paint on iron articles? Iron articles are painted because it prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off. Hence, rusting is prevented their presence is essential for rusting to take place. Oil and Fat containing food items are flushed with Nitrogen. Packaging fat and oil containing foods in nitrogen gas can prevent rancidity.
When the fat and oil present in food materials gets oxidised in air , their oxidation products have an unpleasant smell and taste. When it is surrounded by unreactive gas, nitrogen, there is no oxygen of air to cause its oxidation and make it rancid.
Explain the following terms with one example each. Corrosion is a process where a refined metal is oxidised by atmospheric oxygen to form a more stable compound such as oxides. The metal gradually degrades during the corrosion process. Rusting of iron is a good example of corrosion where the iron is converted to Iron oxide. Millions of dollars 10th Ncert Chemical Reactions And Equations Answers Model are spent annually in preventing rusting from bridges and other monuments. The process of oxidation of fats and oils that can be easily noticed by the change in taste and smell is known as rancidity.
For example, the taste and smell of butter changes when kept for long. Rancidity can be avoided by: 1.
Storing food in air tight containers 2. Storing food in refrigerators 3. Adding antioxidants 4. Storing food in an environment of nitrogen. Testing is the best way to master any field. We feel that there is a direct correlation between the number of tests attempted and improvement in confidence.
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Chemical Reactions and Equations. Notes Introduction,. Types of Chemical Reactions Chemical Reaction : The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is known as Chemical Reaction.
Signs of a chemical reaction- A chemical reaction can be determined with the help of any of the following factors, denote that a chemical reaction has taken place- 1 Change of state of substance.
Melting of ice into water. When wax is burned in the form of wax candle, then water and carbon dioxide are formed. Now, wax is a liquid whereas carbon dioxide is a gas.
This means that during the combustion reaction of wax, the physical state changes from solid to liquid and gas. Example: 3 Evolution of heat. Types of chemical reactions :.
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