science test Flashcards
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What should be used to make a appropiate way to write a method. ( Forensic scientist)
Imperative verbs, in points , SCIENTIFIC TERMS
What is a pure substance
only one substance
What is a mixture?
two or more substances mixed
What is a solution? and give a example
(when a solute is mixed into a solvent and dissolves) 2 or more substances , mixed and are soluble. Can be separated using Evaporation.It is usally transparent example ( suger and water)
what is colloid and give a example
is 2 or more substances mixed that are dissolved in eachother and cannot be seperated ( Milk powder in water) it is usally opaque
What is a suspension ? and give a exampl;e
2 or more substances mixed that are insoluble and can be separeted using filtration. ( sand and water)
What is distillation? and explain the process using scientific terms
Distillation is when you use the process of evaporation, condesnation.IT occurs when 2 substances are dissolved in each other with different boiling points.Then the substance is heated until evaporation takes place inside the conical flask and then the water vapour is then passed into the condenser (filled with cold water).becomes liquid then water is collected insidfea beaker. It is used when substancesare dissolved in eachother
Give one example when do you use distillation
ink in water, sea water to pure substance
What is evaporation? and give a example
Evaporation is when 1 or more substance is heated until it begins to evaporate forming into water vapor.
eg(. suger and water)_
What is heating to dryness and how to avoid it.
When the wtaer is halfly evaporated, turn the heat down to avoid heating to dryness
Sand and water is a example of _______ and it needs to use ____________ to separate
a suspension, filtartion
How to reduce hazards of bunsen burner
wear gloves, saftey goggles, tie up your hair, and keep a suitable distance
what is the most safest flame
the more air the more safer it is. ( the flame with the most orange/ yellow)
What is the most dangerous flame and why
the blue flame. less visible and extremly hoy
what closes and opens the air hole?
moveable coller
