Science 1.4 Pure Substances & Mixtures
3. Hazardous waste such as paints, motor lubricants, household
cleaners/chemicals and especially electronic waste (batteries, computers, tvs
which contain high levels of mercury & cadmium) have to be recycled separately
since they can easily contaminate our land, water and air (especially if the
internal parts are heat to extract i.e. gold from circuit board as done in Asian countries where 70% of world's e-waste ends up) with toxins.
Pure substances: aluminum foil, table salt, distilled
water, sugar, baking soda, 24K gold – are elements listed on a periodic table
Mixtures: coffee, milk, batter, juice, cement, gasoline,
soaps, 14k/18k gold has other metals in it
Cookies: mixture
Sugar: pure substance from the sugar cane
Aluminum foil: pure substance metal
Steel: pure substance metal
Apple Juice: mixture (natural/artificial water, sugars,
flavor)
Water: not 100% pure since it contains naturally
occurring minerals, salts, polluting chemicals.
Lead: pure substance metal
Sweetened water: mixture
Air: pure substance – can mix with other pollutants
Mercury: pure substance
Complete handout 1.6 Check your understanding
Mechanical Mixtures - the particles of matter have not been mixed evenly; you can see all the different kinds of matter i.e. garden soils, omelette.
Solutions such as shampoo have water, fragrance, color, detergent and vitamin/protein particles evenly mixed so it looks like 1 kind of matter.
Mini Lab Text pg.27
Purpose: To create a mixture and observe its properties.
Observations:
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Procedure
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Observations
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1. Oil stirred in
water
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2. Stir food
coloring in oil/water mixture
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3. Stir detergent in
food coloring/oil/water mixture
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Analysis:
Answer A, B, C.
Conclusion:
Explain what you learned about particles in mixtures.
