1. In the heating curve the iron, describe the phase change that occurred between points D and E on the graph? 2. Explain why the temperature stayed constant between points D and E.
3. What is the melting temperature of iron ?
4. What is the freezing point of iron ? How do you know ?
5. What is the boiling temperature of iron?
6. Compare the boiling temperature of iron and water ( water boils at 100°c ). Which substance has stronger intermolecular forces ? How do you know ?

Write a question about how changing temperature affects the gas inside the sports ball

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?