Q2 The temperature-time graph given below shows the heating curve for pure wax. From the graph answer the following:
(a) What is the melting point of the substance?
(b) What is its boiling point?
(c) Which portions of the graph indicates that change of state is taking place.
(d) Name the terms used for heat absorbed during change of states involved in above processes.
Q3 A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
Q 4 Study the given diagram and answer the following questions:
(a) Write the chemical reaction involved in the process.
(b) Mention the colour of:
1. Copper powder and
2. the substance formed after heating it.
Q5 A drop of ink and a drop of honey are placed in wattle in different beakers. Which of the two will spread faster? Give reason for your answer.
Q6 Why do people sprinkle water on a roof after a hot summer day?
Q7 On suffering from high fever, which will lower your body temperature more-ice or ice cold water? Why?
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what a big question!!!!!
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It exists both into the liquid and gaseous states. (b) The melting point of the substance wax is 15°C(1 /2). (c) The boiling point of the substance wax is = 110°C (1/2). ... During melting, at melting point, the heat absorbed is called latent heat of fusion. please like me
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