Water and steam are both 100°C when water is boiling, but a burn from steam is w

Question

Water and steam are both 100°C when water is boiling, but a burn from steam is worse than a burn from the water. Hypothesize why this is true. Click here to enter text. 1. A 10g ice cube, initially at o eC, is melted in 100 g of water that was initially 20°C. After the ice has melted, the equilibrium temperature is 10.93 C. Calculate: 2. The total heat lost by the water (the specific heat for water is 4.186 J/g/K). Click here to enter text. a. The heat gained by the ice cube after it melts (the specific heat for ice is 2.093J/e/K). Click here to enter text b. The heat it took to melt the ice (Hint it takes 334 J of heat energy to melt 1 g of ice). Click here to enter text c. 3. Inside a calorimeter is 100 g of water at 39.8 C. A 10 g objectat 50°C is placed inside of a calorimeter. When equilibrium has been reached the new temperature of the water and metal object is 40°C, what type of metal is the object made from? Click here to enter text

Explanation / Answer

2.

Heat lost by the water will be given by:

Q1 = Mw*Cw*dT

Mw = mass of water = 100 gm = 0.1 kg

Cw = 4186 J/kg-C

dT = 20 - 10.93 = 9.07 C

Q1 = 0.1*4186*9.07 = 3796.70 J

2B.

Heat gained by melted ice

Q2 = Mi*Cw*dT

Mi = mass of ice = 10 gm = 0.01

dT = 10.93 - 0 = 10.93

Q2 = 0.01*4186*10.93 = 457.53 J

2C.

Heat required to melt the ice will be

Q3 = Mi*Lf

Mi = 0.01 kg

Lf = latent heat of fusion = 3.34*10^5 J/kg

Q3 = 0.01*3.34*10^5 = 3340 J

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