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. ► Don’t forget to do the 3 analysis questions on separate paper. Staple them to the back of the worksheet.

Activity 2 Follow-up

Analysis Questions 2. 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

3. 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.

4. 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………

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.

Activity 3 Title: A Plan to Separate the Mixture

Vocabulary ► Mixture ► Observation ► Inference

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

► 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)

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

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

Making Observations ► Make observations detailed ► Example observation:  “It is a liquid”  How could this observation be improved? ► Include texture, color and other specifics

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

Read pg. A-10 Problem: How can you separate the substances in a mixture? Hypothesis/Initial Thoughts:

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.

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

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.