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VARDAAN LEARNING INSTITUTE

Level 1 Worksheet: Chemical Reactions & Equations

Class: 10 Science Focus: Topic-wise Concepts Max. Questions: 60
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Topic A: Chemical Equations & Balancing

Translate the following into balanced chemical equations (Q1-Q8):

  1. Hydrogen gas combines with nitrogen to form ammonia.
  2. Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
  3. Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
  4. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
  5. Calcium hydroxide reacts with carbon dioxide to form calcium carbonate and water.
  6. Zinc carbonate decomposes to form zinc oxide and carbon dioxide.
  7. Magnesium reacts with Hydrochloric acid to form Magnesium chloride and Hydrogen gas.
  8. Sodium sulphite reacts with hydrochloric acid to form sodium chloride, water and sulphur dioxide.

Balance the following chemical equations (Q9-Q16):

  1. $HNO_3 + Ca(OH)_2 \rightarrow Ca(NO_3)_2 + H_2O$
  2. $NaOH + H_2SO_4 \rightarrow Na_2SO_4 + H_2O$
  3. $NaCl + AgNO_3 \rightarrow AgCl + NaNO_3$
  4. $BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + HCl$
  5. $FeSO_4 \xrightarrow{\Delta} Fe_2O_3 + SO_2 + SO_3$
  6. $Pb(NO_3)_2 \xrightarrow{\Delta} PbO + NO_2 + O_2$
  7. $MnO_2 + HCl \rightarrow MnCl_2 + H_2O + Cl_2$
  8. $C_6H_{12}O_6 + O_2 \rightarrow CO_2 + H_2O + Energy$
Topic B: Types of Chemical Reactions

Q17-Q30: Identify the type of reaction and define/explain it.

  1. What is a Combination Reaction? Give one example involving slaked lime.
  2. Define Decomposition Reaction. How is it related to Combination Reaction?
  3. What is a Displacement Reaction? Explain with the help of Iron and Copper Sulphate.
  4. Define Double Displacement Reaction. What is a precipitate?
  5. $2H_2 + O_2 \rightarrow 2H_2O$. Identify the type.
  6. $CaCO_3 \xrightarrow{\Delta} CaO + CO_2$. Identify the type.
  7. $Zn + 2AgNO_3 \rightarrow Zn(NO_3)_2 + 2Ag$. Identify the type.
  8. $Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$. Identify the type.
  9. What is Thermal Decomposition? Give the example of Lead Nitrate.
  10. What is Photolytic Decomposition? Where is it used?
  11. What is Electrolytic Decomposition? Give the example of Water.
  12. Why is respiration considered an exothermic reaction?
  13. Why is the decomposition of vegetable matter into compost considered an exothermic reaction?
  14. Differentiate between Exothermic and Endothermic reactions with one example each.
Topic C: Oxidation, Reduction & Redox

Q31-Q42: Identify Oxidized/Reduced substances and Oxidizing/Reducing Agents.

  1. Define Oxidation and Reduction in terms of Oxygen transfer.
  2. Define Oxidation and Reduction in terms of Hydrogen transfer.
  3. In $4Na(s) + O_2(g) \rightarrow 2Na_2O(s)$, what is oxidized?
  4. In $CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(l)$, identify the oxidizing agent.
  5. In $ZnO + C \rightarrow Zn + CO$, identify the reducing agent.
  6. In $MnO_2 + 4HCl \rightarrow MnCl_2 + 2H_2O + Cl_2$, what is reduced?
  7. In $H_2S + Cl_2 \rightarrow S + 2HCl$, identify the oxidizing agent.
  8. In $PbO + C \rightarrow Pb + CO$, what is the reducing agent?
  9. In $Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe$, name the substance oxidized.
  10. Explain the term Redox Reaction with one example.
  11. Can oxidation occur without reduction? Explain briefly.
  12. Identify the type: $Mg + O_2 \rightarrow MgO$. Is it redox? why?
Topic D: Corrosion & Rancidity

Q43-Q50: Conceptual Questions

  1. What is Corrosion? Give the chemical formula of Rust.
  2. Why do we paint iron articles?
  3. List two methods to prevent rusting of iron other than painting.
  4. What is Galvanisation? Which metal is used in this process?
  5. What is Rancidity? What kind of food materials are affected by it?
  6. List two ways to prevent rancidity in food items.
  7. Why are chips packets flushed with Nitrogen gas?
  8. Does corrosion happen to Copper and Silver? If yes, what are the colours of the layers formed?
Topic E: Activity & Observation Based

Q51-Q60: Analyze the activities and answer.

  1. Activity: Magnesium Ribbon Burning. Why is the ribbon cleaned? What is the colour of the flame and the ash?
  2. Activity: Lead Nitrate + Potassium Iodide. What is the colour of the precipitate formed? Name the compound.
  3. Activity: Zinc Granules + Dilute H2SO4. What gas is evolved? How do you test for it?
  4. Activity: Quick Lime + Water. Does the beaker become hot or cold? Why?
  5. Activity: Electrolysis of Water. Name the gases at Anode and Cathode. What is the ratio of their volumes?
  6. Activity: Heating Ferrous Sulphate. What is the colour change of crystals? What smell is observed?
  7. Activity: Iron Nail in CuSO4. Why does the blue colour fade? What deposits on the iron nail?
  8. Activity: Barium Chloride + Sodium Sulphate. What is the colour of the precipitate? What type of reaction is this?
  9. Activity: Heating Copper Powder. What happens to the copper powder? Write the equation.
  10. Activity: Silver Chloride in Sunlight. What color change is observed? Write the chemical equation.