Let us list the number of atoms of each element on both sides of the equation: Step 5: Question 12. heat; light and; electricity. This is an example of oxidation. Start balancing with the compound (either on the reactants side or on the products side) that contains the maximum number of atoms. Draw a neat, labelled diagram to show the electrolytic decomposition of water. We observe the formation of a new yellow solid substance called lead iodide. When there is an exchange of ions between the reactants to produce new substances, it is called double displacement reaction. Exothermic reactions: What is the reflection of the story the mats by francisco arcellana? For example, iron is more reactive than copper. What type of reaction is this? Answer: The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is Explain the following in terms of gain or loss of oxygen with two examples each: Answer: Therefore, this reaction is a precipitation reaction. Take about 1 g of copper powder in a china dish. Therefore, it is an exothermic reaction. (ii) Sublimation of dry ice The reaction above is represented by the following equation: Write equations for these reactions. The reaction between lead nitrate and potassium iodide is a chemical change that results in the formation of new substances. Here the + sign indicates ‘and’. This compound on heating decomposes to give calcium oxide (quick lime) and carbon dioxide. (D) Iron salt and water are produced. Describe a simple experiment to show that a more active element displaces a less active element from the solution of its compound. TiCl4 (l) + Mg (s) → Ti (s) + MgCl2 (s). 2 Na (s) + S (s) → Na2S (s). What happens when dilute hydrochloric acid is added to iron filings? Question 6. Potassium bromide (aa) + Barium iodide (aa) → Potassium iodide (aq) + Barium bromide(s). Why is it called an exothermic reaction? It is simply a chemical equation written in words. Question 1. Similarly, + sign is put between the products when there is more than one product. A chemical reaction between two substances in which one substance is oxidized and the other reduced is known as reduction-oxidation reaction. Enclose the formula of each reactant and product in separate boxes and do not change the formula or the subscripts of anything inside the boxes while balancing the equation. (A) HCl Answer: Most instances of corrosion are due to oxidation. A chemical equation in which the number of atoms of different elements is not equal on the two sides of the equation is called an unbalanced chemical equation. 3. Represent the reaction involving burning of coal by a balanced chemical equation. Answer: Touch the beaker. 1. Heat the boiling tube over a flame using a spirit lamp. CaCO3 (s) → CaO (s) + CO2 (g) Write down the symbol and formula of each of the reactants and products. Answer: A chemical equation in which the number of atoms of different elements is equal on the two sides of the equation is called a balanced chemical equation. Therefore, hydrogen is oxidised to water. If it is in hydrated form the water evaporates out of it first and it remains purely solid. 2. Question 62. Collect this powder in a watch-glass. Silver nitrate + Sodium chloride → Silver chloride + Sodium nitrate. Oil and fat-containing food items are flushed with nitrogen. Yes, this reaction is a double displacement reaction. (D) All of the above, Question 9. Give an example. This is lead oxide. This reaction also releases heat. Therefore, sodium is oxidised to sodium oxide. This is ferric oxide. List the number of atoms of different elements on LHS (reactants) and RHS (products) separately. To balance the atoms, put a small whole number coefficient before the formula of the compound. This is an example of a redox reaction where one of the reactants is oxidised while the other is reduced. (D) (ii) and (iv) The first one is: (B) 2:1 A chemical equation is balanced so that the numbers of atoms of each type involved in a chemical reaction are the same on the reactant and product sides of the equation. What is rancidity? Answer: (A) Slaked lime In this reaction, the chloride ion present in barium chloride and sulphate ion in sodium sulphate are exchanged to form two new compounds. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. This white crystalline solid is well known for its low solubility in water (this behavior being reminiscent of the chlorides of Tl + and Pb 2+). (A) Hydrogen gas and iron chloride are produced. Hydrogen sulphide + Oxygen → Water + Sulphur dioxide If you are 13 years old when were you born? In this reaction, iron displaces copper from copper sulphate. Heat it using a spirit lamp. Observe the changes. Potassium bromide reacts with Barium iodide. 2AgCl (s) → 2Ag (s) + Cl2 (g) 1. (A) HCl. Iron articles get rusted when exposed to moist air forming a brownish compound called iron (III) oxide. Question 16. Its formula is CaO. (D) All of the above This is an instance of double displacement reaction. Answer: Answer: CaO (s) + H2O(l) → Ca(OH)2 (aq). Explain with an example. 2H2 (g) + O2 (g) → 2H2O (l). The reactants and products are separated by an arrow directed to the right (towards the products). (B) Limewater turns milky because of formation of calcium carbonate. Know the reactants and products of the given chemical reaction and write down the word equation for the reaction. The white crystals of silver chloride turn grey in sunlight. What does a chemical equation represent? During this process, magnesium combined with oxygen to form magnesium oxide. Step 4: Question 29. The balanced chemical equation for the reaction is: CuO + H2 → Cu + H2O. I am assuming you are asking about heating solid crystals of ammonium chloride, and it depends on how strongly it is heated. The process of slow eating up of metals due to reaction with atmospheric gases such as oxygen, water vapour, carbon dioxide etc., is known as corrosion. Write the balanced chemical equation for this reaction. Take about 2 g of lead nitrate powder in a boiling tube. Question 4. 2AgCl -----> 2Ag + Cl Silver Silver Chlorine Chloride (White) ​, hey sharvari pagal mahmaan chale gaye hey bhumi pagal itni jaldi online kaise and yousuf good morning pagali​, ) Which among the following is NOT an antioxidant? Question 46. What is meant by decomposition reaction? Let us now mention the physical state of each of the reactants and products. Let us put all the formulae/symbols in separate boxes. Hence, it is called decomposition reaction. E.g. Question 37. (B) Oxygen gas is formed H2 (g) + Cl2 (g) → 2HCl (g). This is an example of chemical combination. The balanced equation of this is 2 Ag2O -> 4 Ag + O2. Zinc liberates hydrogen gas when it reacts with dilute hydrochloric acid whereas copper does not. reaction: CuO + H2 → Cu + H2O. (D) Displacement reaction. CaO (s) + H2O(l) (Quick lime) → Ca(OH)2 (aq) (Slaked lime) + Heat. Answer: Ano ang pinakamaliit na kontinente sa mundo? This is the exact opposite of combination reaction in which two or more reactants combine to form a single product. Give two examples of chemical changes in daily life. Question 14. Calcium carbonate gives shiny finish to the walls. A chemical equation represents a chemical reaction. C6H12O6 (aq) + 6O2 (aq) → 6CO2 (aq) + 6H2O (l) + energy Question 51. (D) 1:2 A solution of a substance ‘X’ is used for white washing. Answer: Which substances get oxidized in rancidity of food? Therefore, zinc oxide is getting reduced to zinc while carbon is getting oxidised to carbon monoxide. Answer: Give an example of a double displacement reaction. Does Jerry Seinfeld have Parkinson's disease? 5. E.g. The chemical name of quick lime is Calcium oxide, Question 1.


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