Title: Types of Hazards

Activity 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

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.

• 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.

Analysis Questions: