B Distance Learning Week 1
Identifying Changes in the Rate of Dissolution
Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which
circumstance will the calcium chloride dissolve faster?
* It rains, increasing the amount of water on the sidewalk.
Sand is sprinkled on the sidewalk.
The water cools to a temperature of 33°C.
People walking on the sidewalk crush the calcium chloride pellets.
The air pressure increases as the weather changes.
RETRY

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.