202110207-APEX-STUDENT-WORKBOOK-PHYSICAL_SCIENCE-G09-PART1

17. Choose the correct answer. (i) Take some calcium carbonate in a glass plate and heat it. The following equation will explain the reaction. Choose the type of reaction. Heat CaO(s) + CO2 (g) CaCO3(S) (A) thermal decomposition reaction (B) photochemical reaction (C) exothermic reaction (D) chemical combination reaction AS4-Information skills and projects 18. Choose the correct answer. (i) Heat required for a reaction can be depicted by which of the following symbols in the equation? (A) + Q (B) – Q (C) (D) AS6-Appreciation and aesthetic sense, Values 19. Choose the correct answer. (i) Select the example of an oxidation reaction that is helpful to us on a daily basis. (A) Combustion (B) Rancidity (C) Corrosion (D) Alloying (ii) To prevent spoilage of food, which of the following methods is followed? (A) Galvanizing (B) Adding antioxidants (C) Greasing (D) Chrome plating (iii) We can observe iron rods rusting quickly. But our steel utensils do not rust. What could be the reason? (A) Steel utensils are oiled. CHAPTER 6. CHEMICAL REACTIONS AND EQUATIONS 149

(B) Steel is an alloy. (C) Steel utensils are greased due to cooking. (D) Iron utensils are painted to make steel utensils. CHAPTER 6. CHEMICAL REACTIONS AND EQUATIONS 150

PROJECT BASED QUESTIONS —— Project Based Questions —— (i) Make a list of motions that you see around yourself in your daily life and classify them into Linear, Circular and Oscillatory motion. (ii) Collect information on different types of cars and the time they take to reach 100km/h from rest. Calculate the acceleration in each case and make a table. Which car has the most acceleration and why? Discuss in your class. (iii) Make a project report with family members’ assistance to discover substances at home that do or do not dissolve in water. Will various substances dissolve in water once shaken? ((Applying your previous knowledge make a report predicting what will happen when you dissolve (each separately) vinegar, sugar, oil, salt, sand, alcohol, flour, soap, ammonia, and cornstarch in water?)) (iv) Collect information and pictures from internet on few machinery that work on Newton’s third law of motion and make a scrap book. (v) Visit an oil refinery in your locality. Research the pros and cons of using gasoline versus diesel fuel and make a report on it. Also make a list of items that are made from crude oil by fractional distillation in that refinery. (vi) Do research on Tyndall effect and make a report on witnessing Tyndall Effect in your daily life. (vii) So far over a 115 elements have been discovered and known to us . But recently 4 new elements are added in the list. Take help from Newspapers / Science Magazines or internet and make a project report on the discovery of these latest 4 new elements. (viii) When we study about atoms and molecules usually we come across with the names of the great scientists like Antoine Lavoisier, John Dalton, Thomson, Ernest Rutherford, Neils Bohr etc. But there was a Greek philosopher named as DEMOCRITUS who developed one of the first atomist theories of the universe. Take help from your library books or internet and make a project report on Democritus atomic theory. Project Based Questions 151

Additional AS-Based Practice Questions Chapter 1: Motion 1. A person who is sitting inside a moving car says that the tree is moving, but a person who is standing outside says the same tree is at rest. Who is correct and why? [AS2] 2. A bus moves along different paths as shown in figures (a) and (b). Draw displacement vectors for two situations. [AS3] (a) (b) 3. A person is running along a track. How will you calculate the speed of the person?[AS3] 4. Complete the table with right information. [AS4] v(Final velocity) u(Initial velocity) a (Acceleration) s(Distance) (m/s) (m/s) (m/s2 ) (m) 10 8 9 5 20 10 5. What is the formula to calculate the speed? [AS4] 6. Draw the path of motion and velocity vectors at different positions when we whirl a stone which is tied to the end of a string continuously. [AS5] 7. What can we depict from the following graph? [AS5] Additional AS-Based Practice Questions 152

8. Why do you appreciate the equation of uniform accelerated motion? [AS6] 9. How does the representation of a vector help you? [AS6] 10. What information does velocity give? [AS6] 11. Write an instance where you feel like moving though you are at rest? [AS7] Chapter 2: Laws of motion 1. There are two blocks. Block ‘A’ has more mass than block ‘B’. If we apply same force on both the blocks, which one will move farther and why? [AS2] 2. Aditya said that the action-reaction pair in Newton’s third law always represents forces acting on two different bodies simultaneously. Is he correct? [AS2] 3. Write activities to show: [AS3] a) Larger the net force greater the acceleration. b) Larger the mass smaller the acceleration. 4. If you take two eggs and drop them from a certain height such that one egg falls on a concrete floor and another egg falls on a cushioned pillow. What possible changes could you notice in both eggs after they are dropped? Why? [AS3] 5. What is the principle (law) that is used for designing and constructing rocket? Explain that law. [AS4] Additional AS-Based Practice Questions 153

6. Write suitable law (L) and concept (C) to the given situations in the given table. [AS4] S.No. Situation Law Concept 1 Stone is at rest (L1) (C1) 2 Working of rocket (L2) (C2) 3 Fielder catch the ball by pulling (L3) (C3) his arm back 4 (L4) (C4) Birds fly 7. Draw an experimental set up to show the action and reaction forces acting on two different objects. [AS5] 8. What is the depiction of the following image? [AS5] 9. Why do you appreciate the three laws of motion? [AS6] 10. Who formulated the three laws of motion? [AS6] 11. Calculate the momentum of a body of mass 10kg moving with a velocity 15m/s. [AS7] Chapter 3: Is matter pure? 1. If oil and water is mixed up, how would you separate them? [AS2] 2. Raju wants to know the technique that is used for the separation of two miscible liquids. Can you help him by saying the technique? [AS2] 3. What technique is used to separate the mixture if the boiling points of the two liquids are close to each other? [AS3] Additional AS-Based Practice Questions 154

4. Complete the table with right information. [AS4] S.No. Mixture The technique used for the separation 1 Mixture of water and acetone ? 2 Mixture of water and salt ? 3 Mixture of common salt and ? ammonium chloride 4 Mixture of water and oil ? 5. Draw the experimental setup for the process of evaporation. [AS5] 6. Which of the following represent pure substance? [AS5] (a) (b) [AS6] [AS6] 7. Why do we appreciate the fractional distillation? [AS7] 8. Who was the first to establish a useful definition of element? 9. What is the mixture that is separated using handpicking? Additional AS-Based Practice Questions 155

Chapter 4: Atoms and molecules 1. We observe that symbols for elements come from their names. But the same is not applicable for few elements. (For e.g. Iron symbol is not I but it is Fe). Why is that so? [AS2] 2. Complete the table with right information. [AS4] Compound Formula Ammonium Chloride Silver Nitrate 3. Write the symbol for the element Copper. [AS4] 4. Illustrate the concept of mole through a diagram. [AS5] 5. Why do you appreciate Antoine Lavoisier? [AS6] 6. Who introduced the word “mole”? [AS6] 7. Convert into moles: 49g of H2SO4. [AS7] 8. Calculate the molecular mas of H2O. [AS7] 9. What is the use of symbols for elements? [AS7] Chapter 5- What is inside the atom? 1. “Sulphur shows multiple valency.” Explain. [AS1] 2.Can you suggest any other arrangement of subatomic particles in the atom which prevents the revolving electron to fall into the nucleus? [AS2] 3. Should we consider the number of electron as characteristic of an atom? [AS2] 4. What do you think would be the observation if the alpha particle scattering [AS3] experiment is carried using a foil of metal other than gold? 5. What materials did Rutherford use in his alpha scattering experiment? [AS3] 6. Composition of nuclei of two atomic species X and Y are given as follows. [AS4] Additional AS-Based Practice Questions 156

Proton X y Neutrons 6 6 6 8 Give the mass number of X and Y. What is the relation between these two species? 7. What information do you get from 35X17? [AS4] 8. For the symbol H, D and T tabulate three subatomic particles found in each of them. [AS5] 9. Draw the experimental set up of Rutherford’s alpha scattering experiment. [AS5] 10. What is the importance of valency? [AS6] 11. If Z= 3, what would be the valency of the elements? Also name the element. [AS7] Chapter 6 – Chemical reactions and equations 1. Write the chemical formula of lead sulphate. [AS1] 2. Balance the following chemical equation. [AS1] Fe(s) +H2O(g) → Fe3O4 + H2(g) MnO2 + HCL → MnCl2 + Cl2 + H2O HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O 3. Which of the following information is not conveyed by a balanced chemical equation? [AS2] (a) Physical states of reactants and products (b) Symbols and formulae of all the substances involved in a particular reaction (c) Number of atoms/molecules of the reactants and products formed (d) Whether a particular reaction is actually feasible or not 4. On what basis is a chemical equation balanced? [AS2] Additional AS-Based Practice Questions 157

5. What is formed, when a magnesium ribbon is burnt in air? [AS3] 6. Identify the type of reaction in the following: [AS3] Fe + CuSO4(aq) → FeSO4(aq) + Cu(s) 2H2 + O2 → 2H2O Additional AS-Based Practice Questions 158