What is Hazardous at Home?

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What is Hazardous at Home?

• This is due on Monday.
• Get permission from you parents and have them
  sign the safety contract before you begin looking
  for hazardous materials.
• You can use the internet if you think you need
  additional information.
• Dont forget to do the 3 analysis questions on
  separate paper. Staple them to the back of the
  worksheet.

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Activity 2 Follow-up
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Analysis Questions

• Explain in detail the safety guidelines you would
  follow when working with potassium hydroxide.
• When working with potassium hydroxide, which is
  corrosive, I would wear gloves and goggles to
  avoid contact with my skin and eyes. Since it is
  also toxic, I would not eat or drink in the lab
  to avoid ingesting or inhaling it. I would also
  not want to expose anyone else to the substance,
  so I would be sure to keep it in a tightly
  closed, labeled bottle and store it in a locked
  cabinet.

Evidence
4

• Of the substances listed on Student Sheet 2.1,
  which do you think poses the greatest hazard to
  the health of humans and animals? Explain.
• answer should be one of the substances included
  in more than one hazard class (hydrogen peroxide,
  ammonium hydroxide, potassium hydroxide,
  hydrochloric acid, copper chloride, or ethyl
  alcohol).
• a complete and correct answer will include
  justification to support your answer.

5

• If a shipment of sodium borate were sent to your
  classroom, which hazard label(s) do you think
  would be on the box?
• If a shipment of sodium borate were sent to my
  classroom, it would have a _________ label on it
  because

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Notecard Quiz

• Name ___________ Date _______ Period __
• Activity 2, 2
• Copy exactly what you have written in your
  notebook. Writing anything other than what is
  already written in your notebook will result in a
  score of zero.

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Activity 3

• Title
• A Plan to Separate the Mixture

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Vocabulary

• Mixture
• Observation
• Inference

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Background Information

• Matter is either a pure substance (elements or
  compounds) or a mixture
• What is an example of a mixture?
• A mixture consists of 2 or more substances that
  are not combined chemically
• Mixture are usually easy to separate
• Common mixtures include
• Air
• Concrete
• Soil
• Soda
• juice

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• Mixtures can be separated by physical means, such
  as
• Filtration
• Distillation
• Allowing components to settle
• Manually separating using
• Forceps
• Magnets
• Sieves
• Filters
• Phase changes (evaporating or freezing)

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How could you separate the components of

• Vegetable Soup
• Strain the solution
• Oil and Vinegar
• Use a pipette (dropper) to remove the top oil
• Pour the oil off
• Wet Sand
• Evaporate water off
• Filter paper
• Saltwater
• Evaporate or boil water off

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Heterogeneous vs. Homogeneous

• Heterogeneous
• Components can be distinguished visually
• Vegetable soup
• A jar of nuts, bolts, and screws

• Homogeneous (also known as a solution)
• Components cannot be distinguished visually
• Milk
• Saltwater
• Brass (alloy of copper and zinc)
• Orange juice

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Making Observations

• Make observations detailed
• Example observation
• It is a liquid
• How could this observation be improved?
• Include texture, color and other specifics

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Observation or Inference

• There is a clear, colorless liquid at the top of
  the cup. (observation)
• Observation- notes taken that provide evidence
  using 5 senses
• There is a layer of water at the top of the
  cup. (inference)
• Inference- a conclusion based on observations or
  what is already known

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Read pg. A-10

• Problem How can you separate the substances in a
  mixture?
• Hypothesis/Initial Thoughts

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• Observation
• In this space, explain in detail what you observe
  in the sample mixture.
• Materials
• List the materials (using bullets) you would use
  to separate the mixture into its individual
  components.

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• Procedure
• Come up with a plan to separate the mixture. A
  good plan will detail how you will attempt to
  separate solids from liquids, separate the
  liquids, and separate and clean the solids.
• Separating Solids and Liquids
• Separating Different Liquids
• Separating and Cleaning Different Solids
• Clean up

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• Analysis
• Do analysis questions 1, 3, and 5. Make sure
  answers are complete and detailed using
  information you may have learned from this
  activity and from previous activities.