This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 5 Physical And Chemical Changes – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 5 Physical And Chemical Changes Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Describe the process of rusting. A) Rusting is the process of iron or steel reacting with oxygen and water to form iron oxide, also known as rust. B) Rusting is the process of copper reacting with oxygen and water to form copper oxide. C) Rusting is the process of iron or steel reacting with carbon dioxide and water to form iron oxide. D) Rusting is the process of aluminum reacting with oxygen and water to form aluminum oxide. Show Answer Correct Answer: A) Rusting is the process of iron or steel reacting with oxygen and water to form iron oxide, also known as rust. 2. Which of the following can be signs that a chemical change has occurred? A) Color change. B) Formation of a gas (bubbles). C) Energy change. D) All of the above. Show Answer Correct Answer: D) All of the above. 3. Which of the following DOES NOT indicate a chemical change/reaction is occurring? A) Color Change. B) Formation of a Precipitate. C) Formation of gas/bubbles. D) State of matter change. Show Answer Correct Answer: D) State of matter change. 4. A 2 liter of Sprite weighs about A) 2 g. B) 20 g. C) 200 g. D) 2 kg. Show Answer Correct Answer: D) 2 kg. 5. Explain the concept of rusting in terms of physical and chemical changes. A) Rusting is a reversible process with no permanent change to the iron. B) Rusting involves both physical changes, such as the appearance of rust, and chemical changes, as iron reacts with oxygen and water to form iron oxide. C) Rusting is a result of iron reacting with carbon dioxide instead of oxygen and water. D) Rusting is only a physical change with no chemical reactions involved. Show Answer Correct Answer: B) Rusting involves both physical changes, such as the appearance of rust, and chemical changes, as iron reacts with oxygen and water to form iron oxide. 6. What is the chemical nature of the product in the given equation:Magnesium oxide+ Water$\rightarrow$ Magnesium hydroxide A) Acidic. B) Basic. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Basic. 7. Mr. Sauls mixed 2 substances together. What is the best evidence that a CHEMICAL change occurred when he mixed both substances? A) The substance changed in density, volume, or mass. B) The substance changed in color. C) The substance is a liquid. D) None of the above. Show Answer Correct Answer: B) The substance changed in color. 8. Silver is a white metal that is an excellent conductor. Silver tarnishes when exposed to air and light. The density of silver is 10.49 g/cm$^{3}$ The melting point is 962$^{o}$C and the boiling point is 2000$^{o}$C. A chemical property of silver is A) Melting point. B) Boiling point. C) Density. D) Tarnishing. Show Answer Correct Answer: D) Tarnishing. 9. During an experiment, a student observes a color change and gas production. What type of change is most likely occurring? A) Physical change. B) Chemical change. C) Nuclear change. D) No change. Show Answer Correct Answer: B) Chemical change. 10. Which of the following is an example that includes evidence of a chemical change? A) Water is boiled and turns to gas. B) A solid block is ice is heated, and it completely melts into a liquid. C) An iron nail that turns rusty. D) A sample of mineral is broken down into smaller pieces. Show Answer Correct Answer: C) An iron nail that turns rusty. 11. When an object has the ability to be stretched into a thin wire this is A) Density. B) Ductility. C) Dirtability. D) Dissovility. Show Answer Correct Answer: B) Ductility. 12. Which of the following is a chemical property of water? A) Reacts with pure sodium. B) Boils at 100 $^{o}$C. C) Dissolves sugar easily. D) Has a density of 1 gm/mL. Show Answer Correct Answer: A) Reacts with pure sodium. 13. Which one is not an indicator of a chemical change A) Formation of gas. B) Formation of a solid. C) Formation of liquid. D) Change of colour. E) Change in temperature. Show Answer Correct Answer: C) Formation of liquid. 14. Which of the following is a negatively charged subatomic particle? A) Electron. B) Proton. C) Neutron. D) Quark. Show Answer Correct Answer: A) Electron. 15. The difference between a Physical change and a Chemical change is ..... A) Physical change is only a change to the outside appearance. B) Chemical change is when matter is changed into something new. C) Atoms are rearranged in chemical changes & not in physical. D) All are correct. Show Answer Correct Answer: D) All are correct. 16. Why is rusting considered a chemical change? A) It involves a change in state. B) It can be easily reversed. C) It results in the formation of a new substance. D) It involves a change in temperature. Show Answer Correct Answer: C) It results in the formation of a new substance. 17. How does thermal energy move? A) Cold to warmer objects. B) Warmer to cooler objects. C) Solids to liquids. D) None of the above. Show Answer Correct Answer: B) Warmer to cooler objects. 18. Is a car getting rusty a A) Chemical Change. B) Physical Physical. C) Both. D) Neither. Show Answer Correct Answer: A) Chemical Change. 19. You put a shallow glass of water with a 10 tablespoon of salt in the hot, summer sun. After 30 days, you return to find what in the cup? A) Only salt. B) Only water because the salt dissolved into the water. C) Nothing was left in the cup. D) None of the above. Show Answer Correct Answer: A) Only salt. 20. A man painted his main gate made up of iron, to A) (i) prevent it from rusting. B) (ii) protect it from sun. Physical and Chemical. C) (iii) make it look beautiful. D) (iv) make it dust free. Show Answer Correct Answer: A) (i) prevent it from rusting. 21. Melting and boiling point are ..... properties of a substance. A) Physical. B) Chemical. C) Structural. D) External. Show Answer Correct Answer: A) Physical. 22. Dissolving sugar in your coffee is a ..... change. A) Chemical change. B) Physical change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Physical change. 23. Two items are combined inside a balloon. The balloon is tied shut. What observation would indicate that mixing the chemicals produced a gas? A) The balloon can hold a liquid. B) The balloon increases in volume. C) The balloon becomes cold. D) The balloon was tied shut. Show Answer Correct Answer: B) The balloon increases in volume. 24. A change in the color of a substance is A) A physical change. B) A change to a chemical property. C) An indication of a chemical change. D) Not important to observe. Show Answer Correct Answer: C) An indication of a chemical change. 25. A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change? A) Cutting a piece of paper. B) Folding a piece of paper. C) Tearing a piece of paper. D) Burning a piece of paper. Show Answer Correct Answer: D) Burning a piece of paper. 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