Study Guide Features
Issues & Investigations
- 223 pages, perfect bound, consumable
- Keyed to the Student Edition and includes page number [in brackets] to indicate where information is located
- A variety of question styles appear, including fill-in-the-blank, student opinion, multiple choice, crosswords, matching and drawing (graphs, food webs, etc.)
- Included on the Teacher Component disc as Word files
Below is an excerpt from Unit 5 of the Study Guide.
5.4 The Waterworks 
Have a Drink in New York City 
- The Romans used canals or ________________ to carry water from the mountains to the city.
- The settlement of Bethlehem, Pennsylvania was uphill from the spring which was the source of water. The first pump was powered by __________ and the pipes were made of __________________.
- Like other cities, Bethlehem had to search for a new supply of water when the spring _________________________. Today Bethlehemís water supply comes from ________ ______________________________________.
- Identify two major cities that obtain water from distant places.
(1) _______________________________ (2) _______________________________
- What is the major source of water for your city? ________________________________
- The major source of drinking water for New York City is _________________________ ____________________________________________________________________.
- In the summer the reservoir is treated with __________________________ to kill (algae/bacteria).
- Scientists working for the water department include ____________ and _____________.
- Scientists analyze more than (100/1000) water samples each (month/year) from nearly (200/500) locations.
At the Waterworks 
- Water sold by both public and private water suppliers must meet criteria (standards) that are set by the ________.
- Water entering the water treatment plant contains ___________ and other small organisms.
- The purpose of primary disinfection is to ______________________________________ __________________________________________. The disinfectant usually added is _____________, but some cities use ________________.
- Instead of chlorine __________ is used for primary disinfection at the Greater Vancouver System in British Columbia. The one disadvantage is that it is ______________________. One advantage is that it kills (bacteria/protozoa/all microorganisms) it may be possible to avoid the expense of _________________. Another advantage is the use of ozone also reduces the formation of _________.
- Aluminum potassium sulfate or ________ or a mixture of iron II chloride and __________ __________ are added to cause the small particles to stick together. The clumps of particles are called _________.
- ________________________ may be added to raise the pH and reduce ____________.
- Orthophosphate forms a _____________________ on pipes to reduce ______________ and prevent ______________ of lead and copper.
- ___________________________ is added to remove chemicals that cause taste, odor, or color problems. The amount required increases during the _____________ months.
- ___________________________ may also be added to remove organic chemicals including THMs (trihalomethanes) that form when _____________ combines with organic chemicals.
- As water flows through the flocculation tank it must flow over and under a series of ___________. The purpose of these dividers is to (increase the dissolved oxygen level/increase the time allowed) for floc formation.
- As the water moves though the flocculation tank, the floc grows ____________ and heavier. Floc sinks to the bottom in the (flocculation/settling) tank.
- Any floc not removed in the settling tank is removed by the ___________________ filter. As the floc accumulates in the bed of sand, it _________ the flow of water.
- The graded sand filter is cleaned (with a high pressure water jet/ by reversing the flow of water) as the sand is stirred. This process is called a _________________.
- More backwashes are needed during the ____________ months because of the increased growth of _________.
- The wash water is pumped to a lagoon where the _________ settle out. The water may be ________________ and treated for drinking water or returned to a __________ or stream.
- Filtration of the treated water reduces the risk of disease caused by chlorine-resistant _________________________________________. If the waterworks does not have a graded sand filter, high levels of ___________ must be added to kill these organisms.
- Give the reason why these chemicals are added to the water that leaves the waterworks.
sodium hydroxide: ______________________________________________________
- Ozone can be used for primary chlorination but not final chlorination. Explain why. ___________________________________________________________________
- Is fluoride added to the water supply in the city where you live? _______