Transcript Activity 34: Water Pollution

PH Questions
1
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
Balance the following equations:
4
2 2O3 + __C
3 → __Fe
2
3
4. __Fe
+ __CO
2
2Fe2O3 + 3C → 4Fe + 3CO2
Reactants: 4Fe, 6O, 3C
Products: 4Fe, 6O, 3C
2
2
5. __SO
2 + __O2 → __ SO3
2SO2 + O2 → 2SO3
Reactants: 2S, 6O
Products: 2S, 6O
Activity 34
Title: Water Pollution
Read C-21
Problem: What are some sources and
types of water pollution?
Hypothesis/Initial Thoughts:
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 people’s health?
• Water-borne disease: a disease carried
by water.
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
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.
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.
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.
Concept Map
Oil, gasoline,
antifreeze
Water Pollution
Chemical
Contamination
can be
Direct Water
Pollution
Biological
Contamination
Lakes/rivers
can be
produced by
Vehicles
can be
categorized
as
Storm
Sewers
enters water
by
Fertilizer
can be
can be
produced by
Acids
Heavy
metals
produced by
Farms,
Gardens
such
as
Mines
Copper
released
by
may contain
Animal
droppings (pets
or wild
Human sewage
contain
Bacteria
Lead
released
by
Corroded
Water
Pipes
Giardia
contains
Animal waste
from farms
contains
E. coli
Cryptosporidium
Bacteria that
causes Cholera
can
contaminate
Vegetables
and Crops
contains