Question

Chemistry class 9 long question answer chapter 1​

Answer 1

Answer:

Chapter 1 of Class 9: The Matter Around Us Important Questions and their Solutions

IMPORTANT QUESTIONS

Q1. At normal temperature and pressure, a sample of water used in the study was found to boil at 102 °C. How pure is the water? Will this water freeze at 0 °C? Comment.

Q2. A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig. 1.1) would correctly represent the result? Justify your choice.

Explanation:

Answer no. 1 - The boiling point of pure water is 100 ∘C, and the freezing point of pure water is 0 ∘C. The water sample boils at 102 ∘C at standard pressure. Thus, the water sample is not pure. It will freeze below 0 ∘C.

Answer no. 2 - When we heat the mixture, the energy supplied is utilized to melt the ice, and the temperature does not change until all the ice melts because of the latent heat of fusion. On further heating, the temperature of the water would increase.

#SPJ2