Science Study Guide: Thermal Energy/Heat 9th Grade

A new type of oven that cooks food quickly and more completely is the convection oven. The key difference in this type of oven and a regular oven is that it. . .

• circulates the hot air.

• cooks at higher temperatures.

• irradiates the food at the same time.

• sends heat from the inside of the food to the outside.

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Substance Specific Heat (J kg-1 K-1)

Aluminum 900

Copper 390

Brass 380

Silver 230

Platinum 130

Explain why a Chef in a very busy restaurant would prefer a copper pot over an aluminum pot.

• The copper pot would heat faster because it has a lower specific heat value.

• The copper pot would heat slower because it has a lower specific heat value.

• The copper pot would heat faster because it has a higher specific heat value.

• The copper pot would heat slower because it has a higher specific heat value.

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Substance Specific Heat (J kg-1 K-1)

Aluminum 900

Copper 390

Brass 380

Silver 230

Platinum 130

If 130 J of energy were added to 1 kg of each of these samples, which would experience the GREATEST temperature increase?

• Aluminum

• Brass

• Copper

• Platinum

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Which diagram BEST represents a convection heating current?

• 
• 
• 
• 

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Substance Specific Heat (J kg-1 K-1)

Aluminum 900

Copper 390

Brass 380

Silver 230

Platinum 130

Five metal samples, with equal masses, are heated to 200oC. Each solid is dropped into a beaker containing 200 ml 15oC water. Which metal will raise the temperature of the water the most?

• aluminum

• copper

• gold

• platinum

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Substance Number or Calories of Heat

1 80

2 0

The substances in the table are combined, and Substance 1 loses 40 calories of heat. How many calories of heat will Substance 2 eventually gain?

• 0

• 20

• 40

• 80

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A metal ball of mass 100 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 2.5 kJ. Another metal ball of mass 200 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 5.0 kJ. What can be concluded from the data?

• The balls are made of the same material.

• The first ball is made of a material with a higher specific heat.

• The second ball is made of a material with a higher specific heat.

• The specific heat of one of the balls is two times that of the other.

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Change in Temperature

Temperature light on °C Temperature light off °C

Time

(min) Sand Water Time

(min) Sand Water

Start 22 22 Start 58 30

1 26 24 1 52 30

5 36 26 5 46 30

10 44 28 10 36 28

15 58 30 15 26 26

Josh did an experiment recording the changes in temperature in sand and water when exposed to a light source, and then when the light source was removed. Josh noticed that the sand heated up faster than the water and then cools faster than the water. Josh concludes that. . .

• sand is the better insulator.

• water is the better conductor.

• water is the better insulator.

• sand has a higher heat capacity.

Tags

NGSS.MS-PS3-4

Two identical pots, one black and one silver, containing exactly the same amounts of water, are heated to the same temperature. They are left uncovered and placed in the same room. After 15 minutes the water in the black pot is significantly cooler than the water in the silver pot. Which of these statements best explains this difference?

• The black pot emits heat at a faster rate than the silver pot.

• The black pot allows more heat to be lost through evaporation.

• The silver pot absorbs heat from the surroundings in the room.

• The silver pot reflects heat into the water and keeps it warm longer.

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Burning logs in the fireplace produce heat energy. The dog gets warm from the fire when heat energy is transferred by. . .

• the air.

• radiation.

• conduction.

• the flames.