This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 5 Physical And Chemical Changes – Quiz 39 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 39 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When turning on the Bunsen burner, where should the air holes be? A) It does not matter. B) Open. C) Closed. D) None of the above. Show Answer Correct Answer: C) Closed. 2. Which is a Chemical property? A) Thermal Conductivity. B) Density. C) Malleability. D) Flammability. Show Answer Correct Answer: D) Flammability. 3. A chemical change occurs A) When the substance changes form. B) When one or more substances change into a new substance with different properties. C) When a substance changes shape. D) When a substance changes color. Show Answer Correct Answer: B) When one or more substances change into a new substance with different properties. 4. Exothermic reactions release energy to the surroundings. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. Is melting ice a chemical or physical change? A) Chemical. B) Physical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Physical. 6. True or False:According to the law of conservation of mass, mass can be created or destroyed during a chemical reaction. A) Only in certain reactions. B) False. C) Sometimes. D) True. Show Answer Correct Answer: B) False. 7. Would enzymes in our saliva that help break down carbohydrates into simple sugars be considered a physical or chemical change? A) Physical change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical change. 8. Malleability A) Chemical. B) Physical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Physical. 9. A car swerves to avoid a collision with an oncoming vehicle and crashes into a tree. The tree falls over. The car is crunched. Liquids pour out of the car onto the street. Based ONLY on those observations, what happened here? A) Physical Changes. B) Chemical Changes. C) Both Chemical and Physical Changes. D) None of the above. Show Answer Correct Answer: A) Physical Changes. 10. What is burning? A) Physical change. B) Physical property. C) Chemical change. D) Chemical property. Show Answer Correct Answer: C) Chemical change. 11. The formation of a solid when two liquids combine is called? A) Solidification. B) Freezing. C) Precipitate. D) Solubility. Show Answer Correct Answer: C) Precipitate. 12. Saliva breaking down carbohydrates into sugars is ..... A) Physical/mechanical. B) Chemical. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical. 13. For the equation:2H$_{2}$ + O$_{2}$ $\rightarrow$ 2H$_{2}$OHow much H$_{2}$O will be produced if we react 4g of H$_{2}$ and 32g of O$_{2}$? A) Hgum. B) 32g. C) Sneeze. D) 28g. Show Answer Correct Answer: C) Sneeze. 14. Baking a cake A) Chemical. B) Physical. C) All the above. D) None of the above. Show Answer Correct Answer: A) Chemical. 15. A change in which new matter is formed, cannot be reversed A) Physical Change. B) Chemical Change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical Change. 16. Which is not a clue that could indicate a chemical change has occurred? A) Change in color. B) Change in shape. C) Release of energy. D) Formation of an odor. Show Answer Correct Answer: B) Change in shape. 17. Every chemical change involves a transfer of ..... A) Mass. B) Volume. C) Density. D) Energy. Show Answer Correct Answer: D) Energy. 18. When molecules move in a crazy, no patterned way, what state of matter is it? A) Solid. B) Liquid. C) Gas. D) None of the above. Show Answer Correct Answer: C) Gas. 19. Some substances can be obtained in pure state from their solution by ..... A) Evaporation. B) Condensation. C) Boiling. D) Crystallization. Show Answer Correct Answer: D) Crystallization. 20. A burning candle exhibits A) Physical change. B) Chemical change. C) Physical and chemical change. D) No change. Show Answer Correct Answer: C) Physical and chemical change. 21. Which of the following is NOT a sign of a chemical reaction? A) Color changes. B) Cutting into fourths. C) Light is produced. D) Gas is formed. Show Answer Correct Answer: B) Cutting into fourths. 22. Carbon dioxide turns lime water A) Black. B) Orange. C) Blue. D) Milky. Show Answer Correct Answer: D) Milky. 23. What type of change is photosynthesis? A) Physical change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Chemical change. 24. Salt dissolving in water A) Physical change. B) Chemical change. C) All the above. D) None of the above. Show Answer Correct Answer: A) Physical change. 25. Melting of Wax A) Chemical Change. B) Physical Change. C) All of these. D) None of these. Show Answer Correct Answer: B) Physical Change. ← PreviousNext →Related QuizzesClass 7 Science Chapter 5 Physical And Chemical Changes Quiz 1Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 2Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 3Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 4Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 5Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 6Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 7Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 8Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 9Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books