Iesc1an Answers PDF

Answers Chapter 3 4. (a) MgCl2 (b) CaO (c) Cu (NO3)2 (d) AlCl3 (e) CaCO3 5. (a) Calcium, oxygen (b) Hydrogen, bromine (c) Sodium, hydrogen, carbon and oxygen (d) Potassium, sulphur an...

Answers Chapter 3 4. (a) MgCl2 (b) CaO (c) Cu (NO3)2 (d) AlCl3 (e) CaCO3 5. (a) Calcium, oxygen (b) Hydrogen, bromine (c) Sodium, hydrogen, carbon and oxygen (d) Potassium, sulphur and oxygen 6. (a) 26 g (b) 256 g (c) 124 g (d) 36.5 g (e) 63 g Chapter 4 10. 80.006 8 × 8 × = 10% 16 18 11. =90% , 12. Valency = 1, Name of the element is lithium, 13. Mass number of X =12, Y=14, Relationship is Isotope. 14. (a) F (b) F (c) T (d) F 15. (a) ü (b) × (c) × (d) × 16. (a) × (b) × (c) ü (d) × 17. (a) × (b) ü (c) × (d) × 18. (a) × (b) × (c) × (d) ü 2024-25 19. Atomic Mass Number Number Number Name of the Number Number of of of Atomic Neutrons Protons Electrons Species 9 19 10 9 9 Fluorine 16 32 16 16 16 Sulphur 12 24 12 12 12 Magnesium 01 2 01 1 01 Deuterium 01 1 0 1 0 Protium Chapter 7 1. (a) distance = 2200 m; displacement = 200 m. –1 2. (a) average speed = average velocity = 2.00 m s –1 –1 (b) average speed = 1.90 m s ; average velocity = 0.952 m s –1 3. average speed = 24 km h 4. distance travelled = 96 m –1 7. velocity = 20 m s ; time = 2 s –1 10. speed = 3.07 km s Chapter 8 4. c –2 5. 2 m s , 14000 N 6. – 4N 7. (a) 35000 N –2 (b) 1.944 m s 8. 2550 N in a direction opposite to the motion of the vehicle 9. d 10. 200 N –1 12. 3 kg m s 13. 2.25 m; 50 N –1 –1 –1 14. 10 kg m s ; 10 kg m s ; 5/3 m s –1 –1 15. 500 kg m s ; 800 kg m s ; 50 N –1 17. 40 kg m s A2. 240 N A3. 2500 N –2 –1 A4. 5 m s ; 24000 kg m s ; 6000 N ANSWERS 153 2024-25 Chapter 9 3. 9.8 N 12. Weight on earth is 98 N and on moon is 16.3 N. 13. Maximum height is 122.5 m and total time is 5 s + 5 s = 10 s. 14. 19.6 m/s 15. Maximum height = 80 m, Net displacement = 0, Total distance covered = 160 m. 16. Gravitational force = 3.56 × 1022 N. 17. 4 s, 80 m from the top. 18. Initial velocity = 29.4 m s–1, height = 44.1 m. After 4 s the ball will be at a distance of 4.9 m from the top or 39.2 m from the bottom. 21. The substance will sink. 22. The packet will sink. The mass of water displaced is 350 g. Chapter 10 2. Zero 4. – 210 J 5. Zero 9. 9 × 108 J 10. 2000 J, 1000 J 11. Zero 14. 5.4×107J 17. 208333.3 J 18. (i) Zero (ii) Positive (iii) Negative 20. 7.2×107J Chapter 11 7. 17.2 m, 0.0172 m 8. 18.55 9. 6000 13. 11.47 s 14. 22,600 Hz 154 SCIENCE 2024-25