11796082
Description
Flashcards by Miguel Salamanca, updated more than 1 year ago
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Created by Miguel Salamanca
about 7 years ago
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| Question | Answer |
| 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. |
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Give 3 examples of foams.
Image:
Foam (image/jpeg)
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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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