Answer:
The primary goal of water-softening ion exchange systems is _____(1 point)
removing magnesium and calcium from water. ***
removing sodium from water.
introducing magnesium and calcium into water.
introducing sodium into water.
How does a reverse osmosis water purification system operate? (1 point)
Untreated water is subjected to high pressure, causing it to move through a highly permeable membrane, which captures contaminants.
Untreated water is subjected to high pressure, causing it to move through a semi-permeable membrane, which captures contaminants. ***
Untreated water is subjected to low pressure, causing it to move through a highly permeable membrane, which captures contaminants.
Untreated water is subjected to low pressure, causing it to move through a semi-permeable membrane, which captures contaminants.
A city council is debating between two potential water purification systems: reverse osmosis and ion exchange. Cost is the primary criteria for the choice. Which decision is the most likely result of this debate?(1 point)
More research is needed because reverse osmosis systems require specialized maintenance, while ion exchange requires regular replacement of components. ***
A reverse osmosis system would likely be chosen because it does not require specialized maintenance or regular replacement of components.
More research is needed because ion exchange systems require specialized maintenance, while reverse osmosis requires regular replacement of components.hdhdhd
An ion exchange system would likely be chosen because it does not require specialized maintenance or regular replacement of components.
A city council is debating different alternatives for purifying water from a local reservoir. The council is considering ion exchange and reverse osmosis. Bacterial contamination of the water supply is the primary concern, and the council has decided that dealing with this is the main criteria for their choice. Which decision is the most likely outcome of this debate?(1 point)
They are likely to choose reverse osmosis because it is specifically designed to kill bacteria.
They are likely to choose ion exchange because it is specifically designed to kill bacteria.
They are likely to choose reverse osmosis because it addresses a wider range of problems, including bacteria. ***
They are likely to choose ion exchange because it addresses a wider range of problems, including bacteria.
Which of the following is a constraint of a chlorine bleach shock to remove contaminants from drinking water?(1 point)
This treatment only removes large solids.
This treatment only removes microscopic contaminants.
This treatment does not remove bacteria.
This treatment removes bacteria, but not other pollutants. ***
