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CHAPTER 3 – MECHANICAL MIXTURES. Grade 7 Science Presented on: February 17, 2011. Minds On. Compounds. 3.2 – Separating Mechanical Mixtures. SORTING. EXAMPLES. Pizza Salad Laundry. DEFINITION.

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chapter 3 mechanical mixtures

CHAPTER 3 – MECHANICAL MIXTURES

Grade 7 Science

Presented on: February 17, 2011

minds on

Minds On

Compounds

sorting
SORTING

EXAMPLES

Pizza

Salad

Laundry

DEFINITION

  • Involves looking at various pieces and physically moving one or more of the pieces into different containers
  • This allows similar pieces to be put together
floating
FLOATING

EXAMPLES

Melted chicken fat

DEFINITION

  • Lighter component rises to the top of a liquid where it can be skimmed off
settling
SETTLING

EXAMPLES

Gold dust

Waste water treatment

Blood

DEFINITION

  • Heavier component sinks to the bottom of a liquid – the liquid can be poured off leaving the heavier component
device that can be used for settling centrifuge
Device that can be used for SettlingCENTRIFUGE
  • A device that is used by many labs is a CENTRIFUGE
    • It is an equipment piece that holds test tubes
    • The test tubes are spun very quickly causing the heavier component to sink quickly to the bottom
magnet
MAGNET

EXAMPLES

Scrap Metal Yard

DEFINITION

  • Some metals and alloys (iron,steel) are attracted to magnets. If they are part of a mixture we can remove them using a magnet.
device that can be used sieve
Device that can be usedSIEVE
  • A device that is used when there is a mixture with solid and liquid parts
  • This device has many visible holes that allow smaller solid pieces and liquids to pass through blocking large solid pieces
sieving
SIEVING

EXAMPLES

Pasta in Water using a colander

DEFINITION

  • Process in which larger pieces of matter are separated out of the mechanical mixture
device that can be used filter
Device that can be usedFILTER

A device that is used to separate solids from liquids

This device has many small holes that trap solid pieces of a mixture but allow liquids and gases to pass through.

filtration
FILTRATION

EXAMPLES

Pepper in Water

DEFINITION

  • Mixture passes through a filter to separate solid pieces from a liquid or gas
experiment
EXPERIMENT

You will be working in groups – each group will have a letter

Each group will get two cups, salt/pepper mixture, filter paper

Each group member will have a role – number yourselves 1 to 4.

Group Member One: Will go to the side and grab one cup with their group letter which has 50mL of water.

Students will grab a small cup with salt/pepper mixture

Group Member Two: Will mix the mixture and the water using a popsicle stick

Group will work together to try and separate the mixture.