Review 6 and 7: 5th and 8th Pd

If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________

• one reaches a temperature of zero

• they both have an equal temperature

• one runs out of energy

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NGSS.HS-PS3-4

Calorimetry Question:

A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 138.2 g of water at 20.0°C. The final temperature of the system (the water and the metal) is 30.2°C. What is the specific heat capacity of the metal? (Cp of water = 4.18 J/g C )

• 2.56 J/g°C

• 0.391 J/g°C

• 5.29 J/g°C

• 3.50 J/g°C

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NGSS.HS-PS3-1

NGSS.HS-PS3-4

73.5 g of aluminum is heated in boiling water to a temperature of 98.7°C. the Aluminum is then placed in a calorimeter containing 1500.0 g of water at a temperature of 25.40°C. The temperature of the water in the calorimeter increase to a final temperature of 28.20°C. What is the specific heat of the Aluminum?

• 9.33 J/ g C

• 6.38 J/ g C

• 3.33 J/ g C

• 3.38 J/ g C

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NGSS.HS-PS3-1

NGSS.HS-PS3-4

A piece of metal with a specific heat capacity of 0.460 J/g°C at a temperature of 100.0°C is dropped into an insulated container of water. The mass of water is 140.0 g and its temperature before adding the metal is 16.0°C. The final temperature of the water is 17.6°C. What is the mass of the metal?

• 25.7 g

• 24.7 g

• 23.7 g

• 22.7 g

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NGSS.HS-PS3-4

Hot lead with a mass of 200.0 g of (Specific heat of Pb = 0.129 J/g˚C) at 176.4˚C was dropped into a calorimeter containing an unknown volume of water. The temperature of the water increased from 21.7˚C to 56.4˚C. What mass of water is in the calorimeter?

• 23.3 g

• 22.3 g

• 21.3 g

• 24.3 g

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NGSS.HS-PS3-1

NGSS.HS-PS3-4

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1200 g of water from 23 °C to 39 °C? (show your work)

• -80,256 J

• 80.256 J

• 80,256 J

• -80.256 J

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?  (show your work)

• 25g
• 30g
• 20g
• 50g

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NGSS.HS-PS3-1

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at an initial 18.0 °C, what is the final temperature of the water?

• 37.8 °C

• -19.8 °C

• 19.8 °C

• 55.8 °C

1. A 0.3 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g ⁰C, what is the change of the copper's temperature?

• 300 ⁰C

• 544 ⁰C

• 760 ⁰C

• 566⁰C

A 35 grams of Hf absorbs 3500 J of energy. The temperature increases from 56 ⁰C to a final temperature. What is that final temperature? ( Cp for Hf = 0.14 J/ g C)

• 770 ⁰C

• 670 ⁰C

• 570 ⁰C

• 599 ⁰C