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
Corrosive
Biohazard
Explosive
Flammable
Flammable Solid
Gas
Oxidizer
(reactive)
Radioactive
Toxic
What is this sign warning us
about?
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
Demonstration:•Aluminum washers will be placed in:
copper chlorideethanolwater
Set-up
• 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
• 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
Demonstration of Flammable
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 Hazard Class (es) Safety Precaution
Ammonium HydroxideNH4OH in H2O
Carbon Dioxide
Copper Chloride Solution
Ethyl Alcohol(Ethanol)
Hydrochloric Acid Solution
Hydrogen Peroxide
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.