A model car is powered by releasing air from an inflated balloon. A student performs an experiment by inflating the balloon to different sizes and measuring the car’s speed as the air is released. The sketch shows the model car, and the table gives the results from the experiment. Balloon
Circumference
(cm)Car’s Speed
(m/s)
50.5
102
153
206
Which explanation correctly describes how the energy of the balloon-powered car changes as the balloon is inflated to a larger size and then released?

The gravitational potential energy and kinetic energy both increase.
The gravitational potential energy and kinetic energy both increase.

The elastic potential energy decreases, and the gravitational potential energy remains the same.
The elastic potential energy decreases, and the gravitational potential energy remains the same.

The kinetic energy decreases, and t

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

c. is the answer

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