Pure substances and mixtures

Frage	Antworten
What is the density of pure water?	1,000 kg/m3
What is a homogeneous mixture?	It's the substance in which you cannot distinguish its components.
What types of colloids exist?	Aerosols, sols, gels, emulsions and foams
What is the solvent?	The solvent is the main component of a solution
What is the solute?	The solutes are the components of the solution of which there are lesser amounts.
What type of mixtures are colloids?	Colloids are heterogeneous, although they don't seem to be.
What method would you use to separate oil from water?	Decantantion
Say three methods of separation for homogeneous mixtures.	Vaporization, distillation and chromatography.
What are the differences between pure substances and mixtures?	Pure subsatences have one single substance; mixtures result from the physical combination of two or more substances.
Give 3 examples of foams. Image: Foam (image/jpeg)	Sea foam, coffee foam and shaving foam.
Compare and contrast homogeneous and heterogeneous substances.	You can do a map with the ideas
What is a homogeneous mixture?	It's that in which we cannot distinguish different components with our naked eye.
Which is the difference between sieving and filtration?	We use sieving to separate solid components of a heterogeneous mixture, but filtration to separate a solid from a liquid.
Name three different methods of separation for heterogeneous mixtures.	Sedimentation, centrifuging, decantation.
How would you separate a mixture made up of metallic fragments, sand, salt and water?	You could use magnetic separation (metal), then filtration (sand), and, finally, cristalization (salt from water).
What are the sols formed by?	They are formed by very tiny SOLID particles dispersed in a LIQUID medium.
What type of mixture is the air?	It is a homogeneous mixture
Explain two types of colloids	You must be able to explain aerosols, gels, sols, foams or emulsions.
What would you obtain when separating a mixture?	Pure substances.
At the beach, if you want to find coins under the sand with a detector, what kind of separation method would you use to take a coin off of the sand. Describe it.	Magnetic separation. This method allows the components with magnetic properties to be separated.
What tecnique or techiniques would you use to separate the components of a suspension of water and soil.	Decantation
Which is the freezing point of pure water?	Its freezing point is 0ºC
What kind of substance is the alcohol 96º.	Homogeneous mixtures.
Clasiffy the following substances according to whether they are pure or mixtures: salt, copper, oil, fruit shake. oil and water, salt water, wood, air, wine, steel, cement	Pure subsatances: salt, copper, water (destilled). Mixtures: the rest of them.
Compare and contrast heterogeneous and homogeneous mixtures.	To answer you have to consider the different separation techniques, the different appareances...

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Pure substances and mixtures

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