Separation of Mixtures Quiz

why these factors affect the rate of dissolving?

Stirring According to the particle theory of matter, stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. ​​​​​​​​​​​​​​

Temperature According to the particle theory of matter, the temperature of the solvent is another factor that affects how fast a solute dissolves. Generally, a solute dissolves faster in a warmer solvent than it does in a cooler solvent because particles have more energy of movement.

Particle Size According to the particle theory of matter, the third factor that affects the rate of dissolving is the size of solute particles. For a given amount of solute, smaller particles have greater surface area. With greater surface area, there can be more contact between particles of solute and solvent.

Definitions of separation methods

Filtration Is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter.

Distillation Is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. In simple distillation, a mixture is heated and the most volatile component vaporizes at the lowest temperature. The vapour passes through a cooling tube (a condenser), where it condenses back into its liquid state. The condensate that is collected is called distillate.

Evaporation  Is a technique used to separate out homogenous mixtures where there are one or more dissolved solids. This method drives off the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains, Prior to using this method, the mixture should only contain one liquid component unless it is not important to isolate the liquid components. This is because all liquid components will evaporate over time. This method is suitable to separate a soluble solid from a liquid.

PAPER CHROMATOGRAPHY Food scientists separate food colouring for analysis using paper chromatography. A drop of colouring is put onto filter paper. The edge of the filter paper is dipped in water. As the water flows up through the paper, it carries the colours with it. Some colours travel faster than others, so the substances split into different coloured bands.

Sorting Is used on the mechanical mixers, it is done by human eyes. What happened is humans look at the mixer and pick out the different parts of the mixer and sort them into groups base on their similarity. 

Magnetism Used when the mixture is a mechanical mixture. Is when a part of the mixture is attracted to magnets. We use magnets to pick out the parts that are attracted to it and leaves the rest behind. 

Sifting Is also used on mechanical mixtures.  It is defined as a method in which two or more components of different sizes are separated from a mixture on the basis of the difference in their sizes. One of the components past through the sieves leaving to rest behind.  So that means it cannot separate two substances in a mixture which have the same size.