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Chemical Reaction and Equation class ten science chemistry NCERT solution

Question 1: What is meant by a skeletal chemical equation? Using suitable chemical 10th ncert 10th Ncert Chemical Reactions And Equations Answers English chemical reactions and equations answers up, differentiate between a skeletal chemical equation and a balanced chemical equation. Answer 1: If the number of atoms of any element in a chemical equation is not equal 10th ncert chemical reactions and equations answers up both sides, then it is a skeletal equation.

For 10th ncert chemical reactions and equations answers up. Here, the number of chlorine and hydrogen atoms are not equal on both sides.

In a Balance equation, the numbers of atoms of different elements on both sides of a chemical equation are equal. Question 2: Explain the following terms with examples in each case: i Oxidation and ii Reduction.

Answer 2: i Oxidation: it us a process a in which oxygen or any electronegative element is added up or b hydrogen or any electropositive element is removed. Examples are: a Sulphur burns in the air with a blue flame to form sulphur dioxide. Here oxygen is added up to sulphur. Question 3: Why is respiration considered an exothermic reaction? Answer 3: During digestion, food is broken down into simpler substances. Food like rice, potato and bread are made up of carbohydrates.

These carbohydrates are further broken down into glucose. Glucose during respiration inhalation of oxygen is oxidised with the liberation of energy as shown. Thus, respiration is an exothermic process. Examples are: a Hydrogen reacts with chlorine to form hydrogen chloride. Important Questions on 10th Science Chapter 1 What is a balanced chemical equation? Why should chemical equations be balanced?

A reaction which has an equal number of atoms of all the elements on 10th ncert chemical reactions and equations answers up sides of the chemical equation is called a balanced chemical equation. The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products.

It means that the total number of atoms of each element should be equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations should be balanced. Why is respiration considered an exothermic reaction?

Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen 10th Ncert Chemical Reactions And Equations Answers Matlab in the cells and provides energy. The special name of this combustion reaction is respiration.

Since energy is released in the whole process, it is an exothermic process. Why are decomposition reactions called the opposite of combination reactions? Decomposition reactions are those in which a compound breaks down into 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. Why do we apply paint on iron articles? Iron articles are painted because applying paints 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. Nitrogen is an inert gas at room temperature and does not easily react with oil and fat containing items.

On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with 10th Ncert Chemical Reactions And Equations Answers And nitrogen gas to remove oxygen inside the pack. When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided.

Chapter 2: Acids, Bases and Salts �.

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Chapter 4 Carbon and its Compounds. Chapter 5 Periodic Classification of Elements. Chapter 6 Life Processes. Chapter 7 Control and Coordination. Chapter 8 How do Organisms Reproduce. Chapter 9 Heredity and Evolution.

Chapter 10 Light Reflection and Refraction. Chapter 12 Electricity. Chapter 13 Magnetic Effects of Electric Current. Chapter 14 Sources of Energy. Example 1: When zinc oxide is heated with 10th Ncert Chemical Reactions And Equations Answers Dictionary carbon, zinc metal and carbon monoxide are formed. We apply paint on iron articles to avoid their rusting. When a coat of paint is applied to the surface of an iron article, it stops the contact of air and moisture with the iron metal and hence no rusting takes place.

Concept insight: In this reaction, it is to think that what will happen to iron articles if we do not apply paint on them. Iron will react with air and moisture and corrode. Therefore, to prevent corrosion of iron articles we have to apply paint on them.

Concept insight: In this reaction, it is to think that what the properties of nitrogen gas are. It is inert. If it is inert, it will not react with fats and oils and can be used for preventing rancidity. Example - the black coating on silver and the green coating on copper are other examples of corrosion. This process is known as rancidity.

Concept insight: For this answer, write complete definitions of corrosion and rancidity. Also, don't forget to write one example of each.

Enter the OTP sent to your number Change. Resend OTP. Starting early can help you score better! Avail Offer. Ok Cancel. Ok Choose Chapter. Ok Choose Topic. Yes No. Choose Subjects. Choose Chapters. Concept insight: First convert the word equation into skeletal equation and then balance the different atoms on both sides of the equation. Concept insight: First convert the word equation into skeletal equation and then balance the different atoms on both the sides of the equation.

Also, do not forget to write the symbols for different states. Its chemical formula is CaO. Concept insight: The key to this answer is white washing. Recall the substance used for white washing and answer accordingly. When an iron nail is placed in a copper sulphate solution, iron displaces copper from the blue colored copper sulphate solution forming light green colored ferrous sulphate solution and copper metal.

Concept insight: The key to this answer is that a displacement reaction takes place when iron nails are dipped in copper sulphate solution. Recall that iron is a more reactive metal than copper. In this reaction, lead nitrate and potassium iodide exchange ions to form two new compounds lead iodide and potassium nitrate.

Hence, it is a double displacement reaction. Concept insight: Recall that two different atoms or groups of atoms ions are exchanged in double displacement reactions. Concept insight: The key to this answer is to recall all the type of chemical reactions and match with the definitions. It cannot be a combination or decomposition reaction since combination reaction involves one product and decomposition reaction involves one reactant.

Now, match it with displacement and double displacement reaction and see where it fits - whether two displacements are taking place or one. Concept insight: The key to this answer is to remember that metals react with hydrochloric acid to form respective metal chlorides and liberate hydrogen gas. Balance them one by one. Food that we eat includes carbohydrates, proteins, vitamins etc.

During digestion, carbohydrates are broken down into simpler substances called glucose. Glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with energy. This reaction is called respiration. Since energy is released during this process, respiration is an exothermic reaction.

Concept insight: For answering this question, you should know what exothermic reactions are and then relate it to respiration. These insoluble salts separate out from the solution and settle down as precipitate. Example 1: When magnesium is burned in air, magnesium oxide is formed. It has gained oxygen. Example 2: When copper oxide is heated with hydrogen, copper metal and water are formed.

It has lost oxygen. Concept insight: In this reaction, remember that you have to write the definition of oxidation and reduction in terms of oxygen atoms. Also, remember that you have to state two examples. The shiny brown coloured element 'X' is copper and the black coloured compound is copper oxide CuO.

When it will be heated in air, it will form its oxide. So, which oxide is black in colour? When fats and oils are kept for a long time, they get oxidized by aerial oxidation and become rancid and their smell and taste change. Food items containing oil and fat are flushed with nitrogen to prevent rancidity of oil and fat as nitrogen is an inert gas and prevent the oxidation of oil and fats.

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