PH Questions

1
PH Questions

• a. What do the formulas, arrow, and plus signs in
  a chemical equation tell you?
• The formulas tell you the elements and compounds
  involved in the reaction, the arrow means
  yields and points to the products, and the plus
  signs indicate two or more reactants or products
• b. How are reactants and products treated the
  same in a chemical reaction? How are they treated
  differently?
• Both reactants and products are written as
  formulas. Reactants are placed to the left of the
  reaction arrow, whereas products are placed to
  the right side of the reaction arrow.

2

• a. How does the idea of atoms explain the
  principle of conservation of matter?
• In a chemical reaction, the number of atoms
  stays the same. This shows that matter is not
  created or destroyed during a chemical reaction.
• b. If the total mass of the products of a
  reaction is 250 g, what was the total mass of the
  reactants?
• 250 g

3

• Balance the following equations
• 4. __Fe2O3 __C ? __Fe __CO2
• 2Fe2O3 3C ? 4Fe 3CO2
• Reactants 4Fe, 6O, 3C
• Products 4Fe, 6O, 3C
• 5. __SO2 __O2 ? __ SO3
• 2SO2 O2 ? 2SO3
• Reactants 2S, 6O
• Products 2S, 6O

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3
2
3
2
2
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4
Title Water Pollution
Activity 34
5
Read C-21

• Problem What are some sources and types of water
  pollution?
• Hypothesis/Initial Thoughts

6
What do you think of when you hear the term water
contamination?

• Caused by various substances in the water.
• Could the contamination be dangerous to peoples
  health?
• Water-borne disease a disease carried by water.

7
Read pgs. C-22 to C-27

• Answer the stopping to think questions on paper.
• Fill in the blanks on the concept map as you read
• Begin analysis questions 1-4
• Answer the conclusion question

8
Stopping to Think 1

• What are the main types of biological
  contamination, and what are their sources?
• Human sewage containing cholera (not common
  today)
• Animal waste containing E. coli or
  Cryptosporidium from farms, pets, and meatpacking
  plants.
• Giardia can be found living naturally in rivers.
• The waste in water can contaminate food sources
  or enter the water supply in storm water.

9
Stopping to Think 2

• What are some of the ways chemical contamination
  can get into the water supply?
• Fertilizers and chemicals used to kill weeds and
  pests on farms and lawns, gas, oil.
• Antifreeze from vehicles, copper from industry
  and copper water pipes, and acid and metals from
  mining waste.

10
Stopping to Think 3

• What is it about water that makes water
  contamination such a big concern?
• Water travels easily and is hard to contain.
• Water is everywhere in the environment.
• Water is widely used and necessary for life.

11
Concept Map
Water Pollution
Storm Sewers
enters water by
Direct Water Pollution
can be categorized as
Oil, gasoline, antifreeze
Biological Contamination
Chemical Contamination
can be
Lakes/rivers
can be
may contain
produced by
Fertilizer
Animal droppings (pets or wild
Vehicles
can be
can be
Giardia
produced by
Acids
Heavy metals
Farms, Gardens
Animal waste from farms
Human sewage
produced by
contain
Mines
such as
Bacteria
contains
contains
contains
Copper
Lead
E. coli
Cryptosporidium
Bacteria that causes Cholera
released by
released by
can contaminate
Corroded Water Pipes
Vegetables and Crops