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Title: Types of Hazards

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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 ... – PowerPoint PPT presentation

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Title: Title: Types of Hazards


1
Title Types of Hazards
  • Activity 2

2
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

3
Biohazard
Corrosive
Explosive
Flammable
Flammable Solid
4
Gas
Oxidizer (reactive)
What is this sign warning us about?
Radioactive
Toxic
Marine Pollutants
5
Unit A Vocabulary
  • Corrosive
  • a substance that may dissolve metals, ruin
    clothing, or burn skin. Strong acids and bases
    are corrosive.

6
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

7
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.

8
Safety
  • Wear goggles gloves
  • Always label containers

Set-up
  • Demonstration
  • Aluminum washers will be placed in
  • copper chloride
  • ethanol
  • water

9
  • 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
  • dont eat or drink while working with it
  • keep it in a tightly closed, labeled bottle

10
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

11
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.

12
  • 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

13
Data/Observation
  • The table you will create, called Classroom
    Substances, is your data/observation. The Venn
    Diagram will also fall under this label.

14
Data/Observation
  • Classroom Substances

Substance Hazard Class (es) Safety Precaution
Ammonium Hydroxide NH4OH in H2O
Carbon Dioxide
Copper Chloride Solution
Ethyl Alcohol (Ethanol)
Hydrochloric Acid Solution
Hydrogen Peroxide
15
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 doesnt belong in any of the listed
    categories, put it outside the circles.

16
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.
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