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# Questions and Answers **Multiple Choice Questions** 1. **Question:** During a classroom demonstration, you inflate a balloon with air, and it fills the shape and volume of the container. Why do gases, like air, do NOT have a definite shape and volume? **Answer:** Gases have widely spaced,...

# Questions and Answers **Multiple Choice Questions** 1. **Question:** During a classroom demonstration, you inflate a balloon with air, and it fills the shape and volume of the container. Why do gases, like air, do NOT have a definite shape and volume? **Answer:** Gases have widely spaced, moving particles. 2. **Question:** You heat a gas in a sealed container, and the pressure increases. Which property of gases explains this increase in pressure? **Answer:** Gases have widely spaced, moving particles. 3. **Question:** Wet clothes dry faster under the sun. Which process is responsible for this phenomenon? **Answer:** Evaporation 4. **Question:** Imagine you are observing solid carbon dioxide, commonly known as dry ice, disappearing without leaving a liquid behind. Which phase change happens as it? **Answer:** Sublimation 5. **Question:** As you observe a candle burning, the wax near the flame changes its form. Which phase change occurs in the wax during this process? **Answer:** Melting 6. **Question:** Which phase change happens in the formation of ice cubes from water? **Answer:** Freezing 7. **Question:** On a warm day, you notice your ice cream starting to melt. What happens to the particles of ice cream during this process? **Answer:** They move farther apart. 8. **Question:** Which of the following demonstrates deposition? **Answer:** Dew forming on grass. 9. **Question:** As you place water in the freezer, you notice it turning into ice. What happens to the kinetic energy of the particles during this process? **Answer:** It decreases. 10. **Question:** As you heat a substance, you observe it changing from solid to liquid and then to gas. What happens to the arrangement of the particles as the temperature increases? **Answer:** The particles move farther apart. 11. **Question:** As you heat a substance and observe its changes, you notice the particles move more rapidly. Which of the following processes increases the movement of the particles? **Answer:** Melting 12. **Question:** While observing different materials, you notice one changing from solid to another form. Which of the following examples turns a solid into a different state of matter? **Answer:** Cutting a piece of wood 13. **Question:** As you eat ice-cream, you notice it feeling cold when melting? Why? **Answer:** It absorbs heat from your tongue. 14. **Question:** Which phase change explains the use of solid air fresheners? **Answer:** Sublimation 15. **Question:** A student wonders how temperature and kinetic energy change during phase transitions. Which of the following phase changes involves an increase in both temperature and kinetic energy? **Answer:** (Answer not provided in the text) **Note:** Some question numbers might be missing or out of order as they are not all numbered consecutively. The provided OCR likely has some errors in the numbering and some answers are not provided.