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- A representation of liquid water is shown below. Which of the three representations that follow best describes the water after it has boiled into steam?Ethanol melts at -144°C and boils at 78°C at a constant pressure of 1atm. What state of matter must a sample of ethanol be in at 100°C and 1atm?2.The amount of energy involved in melting a substance without changing its temperature is called the A) heat of vaporization. B) calorie. C) joule. D) heat of fusion. E) heat of combustion.
- A student measured the boiling point of an unknown liquid to be 82.9 degrees celsius. After consulting Table 2.1, this liquid is probably __________. Is the liquid pure? Why or why not? Table 2.1 Liquid - Boiling point (Celsius) Isopropyl alcohol - 82 Ethyl acetate - 77 Methyl cyclopentane - 72 Methanol - 65 Acetone - 56 Cyclopentane - 49The boiling point of a certain gaseous substance is -29.27 oF. What is the boiling point in Kelvin? (A) 274.67 K (B) 239.11 K (C) 162.86 K (D) -307.19 KA 540.3 mL sample of carbon dioxide was heated to 307 K. If the volume of the carbon dioxide sample at 307 K is 789.6 mL, what was its temperature at 540.3 mL?
- Measurements of a patient's temperature are routinely done several times a day in hospitalsDigital thermometers are used, and it is important to evaluate thermometers and select the best one. The accuracy of these thermometers is checked by immersing them in liquids of known temperature. Such liquids include an ice-water mixture at 0.0and boiling water at 100.0C at exactly 1 atmosphere pressure (boiling point with atmospheric pressureSuppose the data shown in the following table were obtained on three available thermometers and you were asked to choose the "best one of the three Which would you choose? Explain your choiceHow much ice in grams would have to melt to lower the temperature of 354 mLmL of water from 20 ∘C∘C to 0 ∘C∘C? (Assume that the density of water is 1.0 g/mLg/mL.) Express your answer using two significant figures.A 15.00 g sample of a solid substance is placed in 100.0 g of water at 25°C, and all of the solid dissolves. Then another 2.00 g of the substance is added, and all of it dissolves. A final 2.00 g is added, and none of it dissolves. •Is the first solution saturated, unsaturated, or supersaturated? •Is the second solution saturated, unsaturated, or supersaturated? •What can you tell about the final solution that is in contact with the solid?
- The data table below shows the mass of an 800-gram block of ice as it melts to a 600-gram block of ice. If the current rate of melting continues, how many more minutes will be required for the 600 gram block of ice to reach a mass of 400 grams?The boiling point of hydrogen is -253 oC. What is this temperature in Kelvin? -20 K 285 K 20 K 526 K5.What similarities can you see among the particles of solid, liquid and gas? 6. Are the particles of solid moving? Yes or No? Why did you say so? 7.Which among the states of matter have the weakest attraction between particles? What made you say so? 8. Can the states of matter change from one form to another (ex solid to liquid)? Yes or No? How? 9.What do you call the change in the state of matter? 10. What are the processes involved in phase change?