1. Water Apply Vaporization. Make sure that you are showing each step of your work. 1. How much energy is absorbed when 30.3 g of liquid water boils? 2. An energy unit often encountered is the calorie (4.18 J = 1 calorie). Determine the molar enthalpy of fusion of ice in calories per gram. 3. A typical ice cube has a volume of about 16.0 mL. Calculate the amount of energy needed to melt the ice cube. (Density of ice at 0.°C 0.917 g/mL; molar enthalpy of fusion of ice 6.009 kJ/mol;molar mass of H2O 18.02 g/mol.) Determine the mass of the ice cube.Determine the number of moles of H2O present in the sample.Determine the number of kilojoules of energy needed to melt the ice cube. “Make sure to show your work, and your answers should be provided with the correct amount of significant figures.” YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET. 2. Gases and Pressure Apply In this unit, you learned about pressure, units of pressure, and Dalton’s law of partial pressures. Now, you will demonstrate your understanding of these concepts by responding to the following prompts. In part of your unit project, you will explain how to use Dalton’s law, so this activity is important to prepare you for your project. Make sure you are showing each step of your work. Show the process and find the solution Convert a pressure of 3.25 atm to kPa and to mm Hg.Some hydrogen gas is collected over water at 20.0°C. The levels of water inside and outside the gas-collection bottle are the same. The partial pressure of hydrogen is 742.5 torr. What is the barometric pressure at the time the gas is collected? “Make sure to show your work, and your answers should be provided with the correct amount of significant figures.” YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET. 3. The Gas Laws Apply In this unit, you learned about Boyle’s law, Charles’s law, and Gay-Lussac’s law. Now, you will demonstrate your understanding of these concepts by creating a PowerPoint presentation which addresses the following prompts. You may use multiple slides for each question if needed. In part of your unit project, you will explain how to use Boyle’s law, Charles’s law, and Gay-Lussac’s law, so this activity is important to prepare you for your project. Make sure you explain each step as if you were teaching it to one of your classmates. Boyle’s Law: A balloon filled with helium gas has a volume of 500 mL at a pressure of 1 atm. The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm. If the temperature has remained the same, what volume does the gas occupy at this height?Charles’s law: A sample of neon gas has a volume of 752 mL at 25.0°C. What will be the volume at 100.0°C if pressure is constant?Gay-Lussac’s Law: At 122°C the pressure of a sample of nitrogen gas is 1.07 atm. What will the pressure be at 205°C, assuming constant volume? * YOU MUST COMPLETE THE POWERPOINT PRESENTATION OR THE ASSIGNMENT WILL BE REJECTED * “Make sure to show your work, and your answers should be provided with the correct amount of significant figures.” YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET. 4. Gas Volumes and the Ideal Gas Law Apply In this unit, you learned about Avogadro’s law and the ideal gas law. Now, you will demonstrate your understanding of these concepts by responding to the following prompts. In part of your unit project, you will explain how to use Avogadro’s law and the ideal gas law, so this activity is important to prepare you for your project. Make sure you are showing each step of your work. Avogadro’s Law: At STP, what is the volume of 7.08 mol of nitrogen gas?Ideal Gas Law: A gas sample occupies 8.77 L at 20°C. What is the pressure, in atmospheres, given that there are 1.45 mol of gas in the sample? “Make sure to show your work, and your answers should be provided with the correct amount of significant figures.” YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET. 5. Diffusion and Effusion Apply In this unit, you learned about Graham’s law of effusion. Now, you will demonstrate your understanding of these concepts by responding to the following prompt. In part of your unit project, you will explain how to use Graham’s law of effusion, so this activity is important to prepare you for your project. Make sure you are showing each step of your work. If a molecule of neon gas travels at an average of 400 m/s at a given temperature, estimate the average speed of a molecule of butane gas, C4H10, at the same temperature. “Make sure to show your work, and your answers should be provided with the correct amount of significant figures.” YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET.
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