Question 1: Which of the following is a characteristic of liquids?

Answer: Indefinite shape but definite volume

Question 2: Match the following terms to their definitions:

Answer: See full answer key

Question 3: Fill in the blank: A change from solid to liquid is called __________.

Answer: melting

Question 4: True or False: Gases have a definite volume.

Answer: False

Question 5: True or False: Solids can easily change their shape.

Answer: False

Question 6: Explain why gases are compressible but liquids are not, in terms of particle arrangement.

Answer: Gases are compressible because their particles are far apart, allowing them to be pushed closer together. Liquids have particles that are closer together, leaving little room for compression.

Question 7: Describe the process of sublimation with an example.

Answer: Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the liquid phase. An example is dry ice turning into carbon dioxide gas.

Question 8: Order the following processes to describe the changes of states: condensation, melting, evaporation, freezing.

Answer: See full answer key

Question 9: Calculate the energy required to change 50g of ice at 0°C to water at 0°C. (Specific latent heat of fusion of ice = 334 J/g)

Answer: 16700 J

Question 10: What is the process called when a gas turns into a liquid?

Answer: Condensation

Question 11: Discuss the importance of understanding states of matter in everyday life. Provide at least two examples.

Answer: Understanding states of matter helps in various aspects of daily life, such as refrigeration, which relies on the principles of condensation and evaporation, and cooking, which involves melting and boiling. These processes are essential for food preservation and preparation, respectively.