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Science

9th -

11thgrade

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Energy transformation

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20 questions

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  • 1. Multiple Choice
    30 seconds
    1 pt

    The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

    chemical to electrical to potential

    chemical to electrical to mechanical

  • 2. Multiple Choice
    1 minute
    1 pt

    If 200 J of energy were added to 1 g each of aluminum and copper, which would experience the LEAST temperature increase. Refer to the formula below:

     Q = mcΔT      c = specific heat capacityQ\ =\ mc\Delta T\ \ \ \ \ \ c\ =\ specific\ heat\ capacity  

    Aluminum (c = 0.9 J/g C), because the higher the value for specific heat, the more energy is required for temperature change.

    Copper (c = 0.39 J/g C), because the lower the value for specific heat, the more energy is required for temperature change.

  • 3. Multiple Choice
    3 minutes
    1 pt
    Image

    1. A hot (100 °C) bolt with a mass of 71 grams is placed in 150 grams of cool (20 °C) water.

    This diagram shows the resulting temperature changes. The specific heat of water is 4.184 J/g × °C.

    Approximately how many joules of heat did the water absorb?

    (Heat Lost or Gained = Mass × Specific Heat × Change in Temperature) (Q = m c ΔT)

    2,510.40 J

    1,118.26 J

    1,506.24 J

    22,191.94 J

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