Transcript 7A3: Plan To Separate A Mixture

7A3: Plan To Separate A Mixture
Grade 7
Challenge Question
• How can you separate substances in mixtures?
– By hand
– Using manual tools (strainer, gravity filter, forceps)
– Using machines (vacuum, centrifuge, distillation)
Margin Questions
1. What are three examples of mixtures?
– M&M colors
– Bag of Halloween candy
– Chicken Noodle Soup
2. How would you separate the soup mixture?
– Strain the soup, putting liquid in a bowl
– Separate noodles by hand into another bowl
– Put remaining chicken into a third bowl
Background
• When a HazMat team works with a substance
the team first tries to identify it, after taking
care of any immediate hazards.
• The substance could be a Mixture:
– a combination of two or more pure substances
that can be physically separated
Vocabulary
• Observation:
– Carefully use your senses to gain information.
Hypothesis
• Write an “IF…, THEN…” statement describing
how to separate mixtures.
• If a substance is a mixture, then I predict that
it can be separated into its pure materials by:
– Observing them
– Deciding what makes them different (solid, liquid,
gas, color, density, boiling point, etc.)
– Choosing tools appropriate for the separation task
Lab Tools
• Lab Tray
– To separate materials
• Goggles
– Eye protection
• Forceps (tweezers)
– Picking up and holding
• Eyedropper
– Transfer liquids
• Cup
– Hold and separate items
• Funnel
– Directing liquids
• Wire Mesh (screen)
– Separates solid from
liquid (fits inside funnel)
• Filter Paper
– Separate small solids
from liquid (fits on wire
mesh in the funnel)
• Steel Wool
– Separates solids
Lab Tools
• Lab Tray
• Funnel
• Goggles
• Wire Mesh
• Forceps
• Filter Paper
– Coffee filter
• Eyedropper
• Steel Wool
• Cup
Analysis page A12 #3-5
On separate paper, answer each in 1 paragraph.
3) What safety precautions should you take
when separating mixtures?
4) Why would we ever need to separate the
different substances in a mixture?
5) Could you identify the contents of a green oily
liquid through observation alone?