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Endothermic or Exothermic? Melting ice Endothermic

Endothermic or Exothermic? Melting ice Endothermic Gum on the hot sidewalk Endothermic Warm muffins cooling Exothermic Making ice cream Exothermic Marshmallows placed in hot chocolate Endothermic.

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Endothermic or Exothermic? Melting ice Endothermic

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  1. Endothermic or Exothermic? Melting ice Endothermic Gum on the hot sidewalk Endothermic Warm muffins cooling Exothermic Making ice cream Exothermic Marshmallows placed in hot chocolateEndothermic

  2. Convert the following: 45 Joules = __10.75__calories 23 calories = __96.28_Joules 2.3 kcal = _2.3__ Calories = _2,300__ calories 1.9 kcal = __7.95_ kJ 76300 calories = ______ kJ

  3. From the data below, calculate the heat in Joules Released by the water as it cools. Starting temp = 95° Final temp = 20° 220 g

  4. A beaker with 250 grams of ice is allowed to sit on the lab bench. The final temperature of the water is 20° C. How much energy is absorbed by the beaker of ice? (Sketch the diagram) Temp time

  5. A tray of ice cubes is accidentally left out on the kitchen counter and the ice melts. The temperature of the freezer is -3°C and the kitchen counter is at room temperature. The tray holds 8 cells each 15 ml. How much energy is absorbed by the ice?

  6. A metal block is heated in a hot water bath to 100°C. 10 grams After the block is removed it cools down to room temperature (20°) by losing 2300 J of energy. What is the specific heat of the block?

  7. 60 grams of ice cream absorbs 1000 calories of heat energy as it melts. If the molar mass of the ice cream is 225 grams, calculate the molar heat of fusion for the ice cream. (ΔH= ____kJ/mol)

  8. 200 grams of ethanol, C2H5OH, is placed in a distilling flask and heated until it all evaporates. How much energy is absorbed during this process? (ΔΗvap = 43.5 kJ/mol)

  9. A 200 kg metal beam at 120°C is placed in 1000 kg of water at 20°C. The water temperature goes to 30°C. How many joules of energy was released by the metal beam? What is the specific heat of the metal beam?

  10. A 50 g copper ring at 200°C is placed on an ice cube at 0°C. How many grams of ice will melt?

  11. Heat of Combustion Experiment Data: Mass of Water = 200g Temp water before = 15° C Temp of water after = 50° C Mass of candle before = 12.56 g Mass of candle after = 11.46 g Molar mass of candle wax = 280 g/mol Calculate the heat of combustion for the candle wax in J/g and kJ/mol.

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