QUESTION IMAGE
Question
- a student has a pool of water at 25 degrees c and a bucket of water also at 25 degrees c.
a) which system has the fastest moving particles? explain.
the bucket because the object is smaller so the particles are more together
b) which system has the largest average energy per particle? explain.
c) which system has the most total energy? explain.
kinetic molecular theory
this theory describes all matter as being composed of tiny particles in endless random motion. in a solid, the particles vibrate, but are locked into an orderly array called a lattice. in a liquid, the particles are still touching but are free to move around past one another. in a gas, the particles are moving very rapidly and are widely separated.
- draw particle diagrams that represent samples of a cold gas and a hot gas.
gas behavior
gas pressure is a measure of the collisions of the molecules with the sides of the container. a barometer is used to measure atmospheric pressure; a manometer is used to measure the pressure in a container.
- report the gas pressures on the flask side using the manometers below.
Step1: Determine particle - speed based on temperature
The average speed of particles depends only on the temperature. Since both the pool of water and the bucket of water are at the same temperature (25 degrees C), the average speed of their particles is the same.
Step2: Determine average energy per particle
The average kinetic energy per particle is directly related to the temperature. As they have the same temperature, the average energy per particle is the same for both systems.
Step3: Determine total energy
The total energy of a system is related to the number of particles and the temperature. The pool of water has more water (more particles) than the bucket of water. Since they are at the same temperature, the pool of water has more total energy.
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a) Neither. The average speed of particles is the same because temperature is the same for both.
b) Neither. The average energy per particle is the same because temperature is the same for both.
c) The pool of water. It has more particles at the same temperature, so more total energy.