Which material would be good to use as an insulator for a substance that needs to be kept at a high temperature and why? A air; because the gas molecules are spaced far apart which transfers heat large distances   B concrete; because the tiny air pockets in the material hold the heat in well   C iron; because the metallic atoms conduct heat well around the substance   D water; because it has a high specific heat capacity value

Temperature & Heat 13. At 30 °C the volume of an aluminum sphere is 30 cm³. The coefficient of linear expansion is 24 x 10 C¹. If the final volume is 30.5 cm³, what is the final temperature of the aluminum sphere? Assume B = 3 a 14. A 500-gram cube of lead is heated from 25 °C to 75 °C. How much energy was required to heat the lead? The specific heat of lead is 0.129 J/g-°C. 15. How much heat is required to convert 135 g of ice at -15 °C into water vapor at 120 °C? (Assume c of steam = 1.996 J/g-°C, c of water = 4.1858 J/g-°C, c of ice =2.090 J/g-°C. Lv of water = 540 cal/g & Lf of water = 80 cal/g)

20°C 25°C During day time, water is colder than the sand. Which has higher specific heat capacity, water or sand? * O Incomplete information is given. O Sand, as increases its temperature increases easily. Sand, as it needs less energy to increase its temperature O Water, as it needs more energy to increase its temperature.

9,3 skill application The heating curve below shows the change in temperature of a 20 g sample of a substance as energy is added to the substance as heat. (Note that the horizontal scale of the graph is not uniform.) 600 Gas E 450 Liquid + gas Solid + Liquid liquid 300 Solid 150 1.85 12.0 16.6 855 857 Heat (kJ) d. the specific heat capacity of the vapor e. the latent heat of vaporization Temperature (°C)

A 12 kg object is dropped from a height of 10 m and strikes the ground with a speed of 8.0 m/s. How much heat energy was produced during the fall? a) O J b) 1 200 J c) 400 J d) 800 J

Adding Ice to Water 7 of 16 Constants I Periodic Table An insulated beaker with negligible mass contains liquid water with a mass of 0.250 kg and a temperature of 79.1 °C Part A How much ice at a temperature of -16.0 °C must be dropped into the water so that the final temperature of the system will be 22.0 °C ? Take the specific heat of liquid water to be 4190 J/kg · K, the specific heat of ice to be 2100 J/kg · K, and the heat of fusion for water to be 3.34x105 J/kg. • View Available Hint(s) VO AZ тice 3 kg Submit

0.4 kg water is at room temperature 23 degrees in an aluminum container. An unknown metal with 0.5 kg mass is placed inside the water raising its temperature to 40 degrees. A)What is the specific heat of the unknown metal. B) Would the equilibrium temperature greater, less or the same if the system was not properly isolated.