nov 6 science

Science 1.4 Pure Substances & Mixtures

2.  The carton of orange juice is not a pure substance because the juice is made up of naturally occurring water, sugars, vitamins, minerals, and artificial fragrances and flavors that replicate the scent and taste of a freshly cut and squeezed orange.  Read article http://www.healthzone.ca/health/dietfitness/article/636563--what-s-wrong-with-orange-juice

 

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:

Procedure	Observations
1.       Oil stirred in water
2.       Stir food coloring in oil/water mixture
3.       Stir detergent in food coloring/oil/water mixture

Analysis:
Answer A, B, C.

Conclusion:
Explain what you learned about particles in mixtures.