2kbr chemical name

Give one more example of this type of reaction.    (CBSE 2012) A white salt on heating decomposes to give brown fumes and a residue is left behind. (b)  Write the reaction of the substance ‘X’ named in (a) above with water. B is given out in either an elemental or ionic form. State the chemical reaction of ‘X’ with water. Answer: b) All elements form dioxide with formula MO 2, SO 2 is a gas, SeO 2 is volatile solid. (iii) Combination reaction. \(\text { e.g., } 2 \mathrm{Cu}+\mathrm{O}_{2} \stackrel{\text { heat }}{\longrightarrow} 2 \mathrm{CuO}\) Answer: \(2 \mathrm{FeSO}_{4} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{SO}_{3}\), Question 9. \(2 \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{s}) \stackrel{\text { heat }}{\longrightarrow} 2 \mathrm{PbO}(\mathrm{s})+4 \mathrm{NO}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})\) Define combination reaction. Thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide  (CBSE 2012) A reaction in which two or more elements or compounds combine to form a single compound is called combination reaction. The product formed is magnesium chloride and hydrogen gas. Answer: (b) (i) Molten NaCl is electrolytically decomposed to form sodium metal. 7.63 Given the following equation: 2K + Cl2 -> 2KCl How many grams of KCl is produced from 4.00 g of K and excess Cl2? Question 1. (ii) Pb(NO3)2 + 2Kl → Pbl2 + 2KNO3 While TeO 2 and PoO 2 are non – volatile crystalline solids.. c) Ozone: It is unstable and easily decomposes into oxygen. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. (ii) Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)     (Foreign 2009) Distinguish between an exothermic and an endothermic reaction. (ii) It can be prevented by packaging fat and oil containing foods in nitrogen gas. (b)  Calcium oxide reacts vigorously with water to form calcium hydroxide (slaked lime). It represents the reactants and products that are involved in the reaction. (a) Identify the type of chemical reaction that will take place and define it. CuSO 4.5H 2 O (s) ⇋ CuSO 4(s) + 5H 2 O (g) (d) Displacement. (I) \(6 \mathrm{CO}_{2}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \stackrel{\text { Sunlight }}{\longrightarrow} \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{s})+6 \mathrm{O}_{2}(\mathrm{g})\) Distinguish between a displacement reaction and a double displacement reaction. (ii) Decomposition reaction Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)     (CBSE 2008C) Question 60. Answer: (a) A solution of substance ‘X’ is used for white washing. Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Solid calcium oxide was taken in a container and water was added slowly to it. The reaction in which a substance loses hydrogen or gains oxygen is called oxidation reaction. It is a displacement reaction. (ii) NaOH + HCl → NaCl + H2O + heat What is rancidity? Question 34. Write balanced equation for the reaction between magnesium and hydrochloric acid. (b) Complete the following chemical equation Question 54. Although fluorine is the most active halogen, it doesn’t replace other halogens in their salt solutions because it reacts with water which the salt dissolved in. (iii) oxidation reaction? (a) Explain two ways by which food industries prevent rancidity. Cl 2 + 2KBr → 2KCl +Br 2. (i) Silver bromide on exposure to sunlight decomposes into silver and bromine, The reaction in which more reactive metal displaces less reactive metal. Identify in the following reactions: Question 33. State the type of chemical reactions and chemical equations that take place in the following: (a) Double displacement as well as precipitation reaction. MnO2 + HCl → MnCl2 + Cl2 + H2O   (AI 2008) Reactions that absorb energy or require energy in order to proceed are called endothermic reactions. It is a precipitation reaction. 1 A student was asked to find the mass of salt dissolved in 100 cm3 of sea water. ... Name the substance ‘X’ and write its formula. (b) Which of the above reaction(.s) is/are precipitation reaction(s)? Hydrogen and chlorine react to make HCl. (b) Reaction (i) is a precipitation reaction because one of the product formed is insoluble in water. NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations includes all the important topics with detailed explanation that aims to help students to understand the concepts better. (i) Calcium oxide reacts vigorously with water to produce slaked lime and large amount of heat is released. 3BaCl2(aq) + Al2(SO4)3(aq) → 3BaSO4(s) + 2AlCl3(aq) (a) Why is respiration considered as an exothermic reaction? Answer: Answer: What happens chemically when quick lime is added to water?   (CBSE 2008) 29.2 c. 33.2 d. 24.4Solutionc 33.2 Kcalmol Explain why carbon tetrachloride CCL4 has a lower boiling temperature than water. (b) Write the balanced chemical equation for the following reaction: (i) 2Mg(s) + O2(g) → 2MgO(s) How will the colour of the salt change? Write the balanced equation for the following reaction and identify the type of reaction in each case. Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s). It is an endothermic reaction. Electrical decomposition reaction. Answer: Balance the following chemical equation: Question 1. Question 3. (ii) CaCO3(s) → CaO(s) + CO2(g) Question 53. (ii) Double displacement reaction (Precipitation reaction) Question 23. (i) CaO + H2O → Ca(OH)2 (CBSE 2012) Answer: The process in which taste and smell of food containing oils or fats gets spoiled is called rancidity. The solution will become blue in colour and shiny silver metal will be deposited. Question 4. (ii) \(\mathrm{Zn}(\mathrm{s})+\underset{\text { Blue }}{\mathrm{CuSO}_{4}}(\mathrm{aq}) \longrightarrow \underset{\text { Colourless }}{\mathrm{ZnSO}_{4}}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})\), Question 28. (a)  Calcium hydroxide + Carbon dioxide →nCalcium carbonate + Water, (b)  Zinc + Silver nitrate → Zinc nitrate + Silver, (c)  Aluminium + Copper chloride → Aluminium chloride + Copper, (d)  Barium chloride + Potassium sulphate →nBarium sulphate + Potassium chloride, (a)  Potassium bromide (aq) + Barium iodide(aq) → Potassium iodide (aq) + Barium bromide(s), (b)  Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g), (c)  Hydrogen (g) + Chlorine (g) → Hydrogen chloride (g), (d)  Magnesium (s) + Hydrochloric acid (aq) → Magnesium chloride(aq) + Hydrogen(g). Identify the type of reaction in the following example: \(\mathrm{FeSO}_{4} \stackrel{\text { heat }}{\longrightarrow} \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{SO}_{3}\) (ii) In desert plants the stomata are open at night. Answer: In physical change, no new substance is formed, whereas in a chemical change, new substance(s) is/are formed. Coke or carbon is used as reducing agent. (a) The precipitate is yellow in colour. They can be drawn into wires. The following diagram displays a chemical reaction. The following observations in an activity may suggest that a chemical reaction has taken place: Question 12. Question 6. Combustion of methane is another example of exothermic combination reaction. State the type of chemical reaction that occur in the change.     (CBSE 2013) Explain, giving one example for each of the following chemical changes: (a) Double decomposition (b) Thermal dissociation (c) Reversible reaction (d) Displacement . Answer: (ii) exothermic reaction, (iv) Displacement reaction. Observe carefully and answer the following questions The number of atoms on left hand side of the reaction (i.e., reactants) is equal to the number of atoms on the right hand side of the equation (i.e., product). Give an example of oxidation reaction. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire. (b) Write the chemical equation of the reaction that takes place. Answer: For the reaction C2H4Br2 3KI C2H4 2KBr KI3 Initial rate data at 60 °C are [C2H4Br2] M [KI] The isoelectric point pI of a peptide is the pH at which the peptide does not migrate in an electr Select one a. Given examples to support your answer.   (Foreign 2008) (iii) Decomposition reaction. Observation: In this reaction, calcium carbonate is obtained as a precipitate. 4 *P40134A0428* Answer ALL questions. 2H2O → 2H2 + O2 (Balanced chemical equation). Lead monoxide, nitrogen dioxide and oxygen gas will be liberated. The compound is lead(II) iodide with chemical formula PbI 2. Na2SO4 + BaCl2 → BaSO4 + 2NaCl (ii) When do desert plants take up carbon dioxide and perform photosynthesis?        (CBSE 2015) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O Reduction Reaction: It is a chemical reaction in which loss of oxygen or gain of hydrogen takes place. (iii) Write the chemical equation for the reaction. (i) Aluminium + Bromine → Aluminium bromide It is because properties of compound (H2O) are different from properties of its constituting elements, i.e., H2 and O2. Question 8. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Silver turns black, the reaction is decomposition. Answer: What is meant by skeletal type chemical equation? Double displacement as well as precipitation reaction. (b) Discuss the importance of decompostion reaction in metal industry with three points. In black and white photography AgBr gets decomposed due to light and forms silver metal and bromine gas. Answer: Answer. Answer: (i) It is a double displacement reaction. Question 45. Balance the given chemical equation:   (AI 2008C) On adding water to it, combination reaction takes place to give calcium hydroxide with release of large amount of heat. Cu + 2AgNO3(ag) → Cu(NO3)2(aq) + 2Ag(s), Question 7. (ii) CaO(s) + H2O(l) → Ca(OH)2(aq) (ii) MnO2 is getting reduced and HCl is getting oxidised. Name the type of reaction. A chemical language Dalton suggested that each element should have its own symbol – a form of chemical shorthand.

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