Buds Public School, Dubai 2018– 2019

Work sheet – Chemical reactions and equations

Name: ………………………. Date: …………………..

Grade: 10 Sec: Subject: Chemistry

  1. Observe the following activity and identify the following questions
  1. Type of chemical reaction

______

  1. Write a chemical equation to represent the above change

______

______

  1. Name the gas evolved in above reaction ______
  2. Is there any colour change in the above reaction? If yes, mention the colour change. ______
  3. Name the coloured substance formed ______
  1. A light sensitive compound `X’ of silver is used in photography. On exposure to sunlight its colour change to grey.
  1. Identify X: ______
  2. Write chemical equation to express the above change.

______

  1. Identify the type of chemical reaction.______
  1. Is it advisable to store ferrous sulphate in zinc container? If not why?

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  1. Which amongst the following reactions is not possible? Give reason.
  1. Fe(s) + ZnSO4(aq)------> FeSO4(aq) + Zn(s)
  2. Mg (s) + ZnSO4(aq)------> MgSO4(aq)+ Zn(s)
  3. Al(s) + ZnSO4 (aq) ------>Al2(SO4)3(aq)+ Zn(s)

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  1. Identify the substances getting oxidized and reduced in the following chemical reaction

MnO2 + 4HCl ------> MnCl2 +2H2O +Cl2

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  1. A metal X is available in the form of ribbon and burns in air with dazzling white flame upon heating. It leaves a white powder Y which dissolves in water and its solution turns red litmus blue.
  1. Identify X and Y: ______
  2. Write balanced equation of Y with water

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  1. Why it is advised to clean X with sand paper before burning?

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  1. Write chemical formulae for the following compound
  1. Ammonium chloride: ______
  2. Calcium nitrate:______
  3. Sodium sulphate:______
  4. Potassium carbonate:______
  5. Ferric oxide:______
  1. Give one example of each of the following equations
  1. Combination reaction:______
  2. Decomposition reaction: ______
  3. Displacement reaction:______
  4. Double displacement:______
  1. Give an example of photo chemical reaction. ______
  2. a. What is observed, when solution of potassium iodide is added to a solution of lead nitrate, taken in a test tube?

b. What type of reaction is this? ______

c. Write a balanced equation to represent the above reaction.

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  1. Distinguish between displacement and double displacement reaction. Identify displacement and double displacement reaction from the following reactions.
  1. HCl(aq) + NaOH ------> NaCl (aq)+ H2O(aq)
  2. Fe(s)+ CuSO4 ------>Fe SO4 (aq) + Cu(s)
  1. What is an oxidation reaction? Identify in the following reactions:

______

(i)The substance oxidized (ii) the substance reduced

ZnO + C ------> Zn +CO

  1. Define combination reaction. Give examples of a combination reaction, which is also exothermic.

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  1. Solid calcium oxide was taken in a container and water was added slowly to it.

(i)State the two observation made in this experiment

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(ii)Write the name and chemical formula of the product formed.

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  1. a. A solution of a substance X is used for testing carbon dioxide. Write the equation of the reaction of X with carbon dioxide.

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b.How is X obtained? Write chemical equation.