Transcript Activity 2 Title: Types of Hazards Read • A-6 • Problem: What types of hazards do certain substances pose? • Hypothesis/Initial Thoughts: Share your thoughts with each.

Activity 2
Title: Types of Hazards
Read
• A-6
• Problem:
What types of hazards do certain
substances pose?
• Hypothesis/Initial Thoughts:
Share your thoughts with each other and
write them down
Biohazard
Corrosive
Explosive
Flammable
Flammable
Solid
Gas
Oxidizer
(reactive)
Radioactive
What is this sign
warning us
about?
Toxic
Marine Pollutants
Unit A Vocabulary
Corrosive
• a substance that may dissolve metals,
ruin clothing, or burn skin. Strong acids
and bases are corrosive.
Unit A Vocabulary
Flammable
• easily ignitable and capable of burning
rapidly. Can serve as a fuel for a fire.
Toxic
•materials that are poisonous if
inhaled, ingested, or absorbed through
the skin
Demonstration of Corrosive
• According to the D.O.T., a corrosive
substance is one that reacts chemically
to disintegrate or wear away at another
substance. A test to indicate if a liquid is
“corrosive” determines if the liquid
reacts chemically with a solid.
Safety
• Wear goggles & gloves
• Always label containers
Set-up
Demonstration:
•Aluminum washers will be placed in:
copper chloride
ethanol
water
• What did you observe in each beaker?
• What is the evidence a chemical
reaction occurred?
• What safety precautions should you
follow if working with a corrosive liquid?
– wear goggles & gloves
– minimize spills
– avoid contact of solutions with skin and
clothing
– don’t eat or drink while working with it
– keep it in a tightly closed, labeled bottle
Demonstration of Flammable
• A substance is flammable if it catches on fire
when exposed to a spark, flame, or heat
source
• I will attempt to ignite copper chloride, ethanol
and water. Which of the liquids do you think
are flammable?
• What safety precautions should you follow if
working with a flammable substance?
– wear goggles & gloves
– Handle and store away from flames or source of
heat
Doing the activity in groups:
• Students work in pairs to classify
chemicals
• Each group of 4 will share a set of 12
chemical data cards. You will use 6 per
pair and trade when you are done with
those.
• Pairs of students within a group of 4 are
expected to talk to each other and
discuss discrepancies in data or
observations.
• In science, collaboration is essential to
the development of new ideas and to a
better understanding of scientific
concepts and should not be considered
“cheating”
• Fully read the materials and procedure
before you begin. Re-read each step as
you perform the activity
Data/Observation:
• The table you will create, called
“Classroom Substances”, is your
data/observation. The Venn Diagram
will also fall under this label.
Data/Observation:
Classroom Substances
Substance
Ammonium Hydroxide
NH4OH in H2O
Carbon Dioxide
Copper Chloride
Solution
Ethyl Alcohol
(Ethanol)
Hydrochloric Acid
Solution
Hydrogen Peroxide
Hazard Class
(es)
Safety Precaution
Venn Diagram of Classroom Substances
• This is a continuation of
Data/Observation.
• You will need to write small, especially
for substances that qualify for all 3
categories.
• If it doesn’t belong in any of the listed
categories, put it outside the circles.
Analysis Questions:
• Answer questions 2-4 in your notebook.
Be sure to include evidence to support
you ideas when it is possible.
• Be accurate and explain completely.
• We will go over analysis question
grading next class period.