Transcript Activity 2 Follow-up

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.
Evidence
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.
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.