O States of Matter Interpreting a heating curve 0/5 E A pure sample of Substance S is put into an evacuated flask. The flask is then heated steadily and the temperature measured as time passes. The results are graphed below, in the middle (in green). Identical experiments are now run on Substance Y and Substance Z. Substance Y is just like S except that it has a higher heat capacity in the solid phase C, (s). Substance Z is just like S except that it has a higher enthalpy of vaporization AH,. Select the graphs below, on the left and right, that show the results you expect for these new experiments. Substance Y (higher C. (s)) (Drag the slider to choose an image) 2 temperature (°C) Substance S Substance Z (higher AH) (Drag the slider to choose an image) added heat (kJ/mol) 2 X G

Learning Goal: To understand the concepts of heat capacity, specific heat, and molar heat capacity. Heat capacity, C, is the amount of energy required to raise the temperature of a substance by exactly one degree Celsius. The energy needed to warm an object increases as the mass of that object increases. We see this in our everyday life. For example, we know that it takes much more energy to heat a large tank of water than a small cup. Because of this dependence on mass, experimentally determined heat capacities are always reported in terms of the amount of the substance that is heated. One method is to report how much energy it takes to raise the temperature of one mole of a substance by exactly one degree Celsius. This value is the molar heat capacity, which has the symbol Cp. The molar heat capacity is given in the units J mol- °C-1.A second method is to report how much energy it takes to raise the temperature of one gram of a substance by exactly one degree Celsius. This value is…

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Energy cannot be created nor destroyed, but it can be transferred between a system and its surroundings. The change in internal energy, AU, is positive if the system absorbs energy, and it is negative if the system releases energy. (Figure 1) The total change in internal energy is the sum of the heat, q, and work, w: AU=q+w. igure AU Allgyntem >0 Al system ▼ Part A Classify the following by the sign of AU for the system. Drag the appropriate items to their respective bins. If no definitive classification can be made, drag the item into the bin labeled "Not enough data." ▸ View Available Hint(s) Negative The system expands and the surroundings get hotter Submit ✓ Correct Part B Submit Previous Answers AU- Value Provide Feedback Positive μA The system contracts and the surroundings get colder. A gaseous reaction occurs at a constant pressure of 30.0 atm and releases 57.1 kJ of heat. Before the reaction, the volume of the system was 6.80 L. After the reaction, the volume of the system…

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If 3.00 kJ of heat is supplied to a 0.880 mol sample of solid copper at 25.0°C, what will the copper’s final temperature be in °C? (The specific heat of solid copper is 0.385 J/g • K.)

A 102.8 g sample of a metal initially at 183.00C is placed in 35.0 ml of water initially at 25.0 0C. After reaching thermal equilibrium, the final temperature of the system is 58.80C. What is the identity of the metal? Assume no heat is lost to the surroundings.

A piece of unknown metal with a mass of 30g is heated to 110 degrees celsius and dropped into 100g of water at 20 degrees celsius. The final temperature of the system is 25 degrees celsius. Determine the specific heat of the metal.

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