1. In this experiment, during the melting process of Hypo (crystalline), the thermometer reading:
- A. Continues to rise
- B. Continues to drop
- C. Stays constant
- D. Fluctuates up and down
Back to Experiment
Melting of Crystalline and Amorphous Solids - Quiz
Progress1 / 10
In this experiment, during the melting process of Hypo (crystalline), the thermometer reading:
Melting of Crystalline and Amorphous Solids - Quiz - Quiz Questions
Test your understanding of melting, melting points, and temperature-time curves with the following exercises.
2. When Paraffin (amorphous) is heated and melted, its state change appears as:
- A. Instantly turns into liquid
- B. First softens, thickens, then gradually becomes thinner
- C. Remains hard until burnt
- D. Temperature stays at $0^\circ\text{C}$
3. The main purpose of placing the test tube in a beaker filled with water for heating (water bath method) in the experiment is:
- A. Reduce heat loss
- B. Shorten heating time
- C. Ensure Hypo/Paraffin is heated uniformly
- D. Observe water consumption
4. When Hypo is melting, if the alcohol lamp is removed (heating stopped), Hypo will:
- A. Continue to melt
- B. Stop melting
- C. Temperature drops immediately
- D. Freeze into ice immediately
5. True or False: All solids have a fixed melting temperature, and this temperature is called the melting point.
- True
- False
6. Given the heat of fusion of ice is $L = 3.34 \times 10^5 \text{J/kg}$. If $200\text{g}$ of $0^\circ\text{C}$ ice is to be completely melted into $0^\circ\text{C}$ water, how much heat needs to be absorbed?
- A. $6.68 \times 10^3 \text{J}$
- B. $6.68 \times 10^4 \text{J}$
- C. $3.34 \times 10^4 \text{J}$
- D. $3.34 \times 10^5 \text{J}$
7. How to judge whether an unknown solid is crystalline or amorphous by observing the temperature-time curve?
- A. Check the starting temperature of the curve
- B. Check if the curve has a horizontal segment (plateau)
- C. Check the color of the curve
- D. Check the length of heating time
8. Which of the following substances is crystalline?
- A. Glass
- B. Asphalt
- C. Table Salt
- D. Rosin
9. Glassblowers can blow glass into various art pieces. What property of glass is mainly used here?
- A. Glass has a fixed melting point for precise temperature control
- B. Glass is crystalline and flows well after melting
- C. Glass is amorphous and has strong plasticity during softening
- D. Glass is very hard
10. The essential difference between "Melting" and "Dissolving" is:
- A. Melting requires heat, dissolving does not
- B. Melting is a physical change, dissolving is a chemical change
- C. Melting is a phase change from solid to liquid; dissolving is a solid dispersing into a liquid to form a solution
- D. No difference, just different names