1.What is the difference between mixture and pure substance? 2.Why is it impossible to achieve a temperature of 0 Kelvin?
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1.What is the difference between mixture and pure substance?
2.Why is it impossible to achieve a temperature of 0 Kelvin?
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- 5. A piece of ice (at 0°C) is dropped into a cup of water at 25°C. The cup is aluminum and has a mass of 75 g and we have 150 g of water. The final temperature of the water when all the ice melts is 22°C. How much ice did we use?1. What is the distinction between gas and vapor? A. They are the same thing B. Vapor is gas in the presence of the liquid or solid phase of the same substance. C. Vapor refers to gas after the boiling point is reached2. For an ideal gas, when both the pressure and volume are each halved, then the (Kelvin) temperature is A. also halved B. quadrupled C. unchanged D. decreased by 4x E. doubled
- What must (necessarily) happen when heat is added to a material?A. The temperature of the material will increase.B. The pressure of the material will change.C. The volume of the material will decrease.D. Phase of the material will change.E. Additional information is required to answer.3. If the temperature of an ideal gas is raised from 30 °C to 210 °C, how many times faster is the new average (ms) speed of the gas molecules? times5. A gas with volume V, pressure P, and temperature T is inside a container with a moveable piston. No gas is leaking from the container as the temperature of gas is quadrupled while the volume is doubled. What will be the new pressure? A. 2P B. P C. 1/2 P D. 8P
- 1. Suppose the amount of air in a person's lungs is 2.2 L, Calculate the number of moles of air molecules in the person’s lungs when the pressure there is atmospheric pressure. Note that the air is at 37.0°C (body temperature). 2. An expensive vacuum system can achieve a pressure as low as 1.05 × 10-7 Pa at 20°C, How many atoms are there in a cubic centimeter at this pressure and temperature?2. A simple pendulum is made using a long thin metal wire. When the temperature drops, does the period of the pendulum increase, decrease, or remain the same? Justify your answer.