Task 2 Print
Obtaining Drinking Water
Water covers about 71% of Earth's surface, but only about 3% of that water is fit for drinking. And of this 3%, only about 1% is
easily accessible. Many countries, including some economically developed countries, face a shortage of water because of
depleted resources and climatic conditions. In this task, you'll learn about several processes that can be used to purify water
for drinking.
Part A
Suppose that you manage the public works department for your community. You've been asked to develop a practical
process for providing drinking water for all the residents. List the criteria and limitations that you must keep in mind while
designing the process or facility.
B I y XX, Font Sizes А А
III

since electrons are negative the answer is neagtaive

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.