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what are compounds 2 (what affects rate of dissolving? (temperature (most…
what are compounds 2
what affects rate of dissolving?
rate of dissolving is measure of how fast substance dissolves in solvent
temperature
most solids dissolve faster in higher temperatures
pg 81
surface area
small pieces of solid dissolve faster than large pieces
because small pieces have larger surface area in contact with solvent
stirring
solids dissolve faster when solution is stirred
pg 82
disposal of harmful substances
every day, homes and industries produce alot of waste
this waste often contains harmful substances
if waste is not disposed of properly, these substances can harm our health and environment
human waste: may enter rivers directly from floating toilets. this waste contains harmful bacteria that causes diseases such as cholera. drinking such water is dangerous
untreated waste water: from factories sometimes dumped into rivers or sea. this water often contains poisonous substances such as mercury or lead compounds. lead compounds can damage organs and affect children's development
Mobile phones: many are thrown away as rubbish when new ones are bought and end up in landfills. phones contain harmful compounds and metals such as lead and mercury . these substances can leak into soil and water supplies
waste from nuclear industries: substances like plutonium and uranium
when incorrectly disposed of, these substances may ontaminate soil and our water supplies. these substances may cause cancer, affect development of unborn babies and cause genetic damage in living things. they also remain toxic for long periods of time, making them even more dangerous
pg 85 86 87