Presentation on theme: "Topic : Mixing and Dissolving"— Presentation transcript:
1Topic : Mixing and Dissolving Matter and MixturesTopic : Mixing and Dissolving
2Mixing and DissolvingAll pure substances have their own unique set of properties, or characteristics.All mixtures contain two or more pure substances, which have their own distinct properties (some of which may be hidden)
4Homogenous Mixtures- are mixtures which look as though they have only one set of properties.- the blended mixture has equal amounts of both substances (all parts of the mixture are the same)- if the homogenous mixture does not have any settling of any of the substances it is made of, then it is called a solution- solutions occur because each particle slips between each other particle and is evenly distributed throughout the entire mixture
5Heterogeneous mixture Classification of:-in which the particles settle slowly after mixing, is called a suspension (eg. orange juice)- a heterogeneous mixture, in which the particles do not settle at all, is called a colloid (eg. fog)- to disperse the particles for a longer period of time, an emulsifying agent (like a protein) is used to form an emulsion (eg. mayonnaise)- mixtures that are obviously two or more substances are called mechanical mixtures -the separate parts of the mechanical mixture are called phases
6What Makes Materials Dissolve? - forming a solution by mixing two or more materials together is called dissolving- dissolving occurs because of the attraction between the particles (there may be a stronger attraction to the particles of another substance, than to the particles of the same substance)Using the particle theory explain how a substance dissolves?
7Why does Salt dissolve in water? The salt molecules have a strong attraction to the water molecules so the salt dissolves and forms a solution.The water is the solvent (part of the solution that does the dissolving)The Salt is the solute (part of the solution that is dissolved)
8Solutes and SolventsThe solute is the substance that dissolves in a solvent.The solvent is the substance that dissolves the solute to form a solution.Soluble means to be able to be dissolved in a particular solvent. Solutes and solvents can be gases or liquids.
9Identify: Solute and Solvent AirPop*20 K Gold jewelrySteelSalt waterSolvent-Nitrogen: Solute-OxygenSolvent-Water Solute-Sugar & CO2Solvent-Gold Solute-Other metalsSolvent-Iron Solute-Other metalsSolvent-Water Solute-Salt
10Water - the Universal Solvent - it is called the 'universal solvent' because it can dissolve so many materials97% of the water on Earth is Ocean water, 2% is frozen and only about 0.5% is 'usable' -and even this has materials already dissolved in it that can be harmful
11The Rate of Dissolving- the speed at which the solute dissolves in a solvent is called the rate of dissolving and can be affected by:- agitation (stirring or shaking)- temperature: increase of decrease- pressure: increase of decrease
12How Much Can Be Dissolved? the limit to concentration is called solubilitya saturated solution is one in which no more solute will dissolve in a specific amount of solvent at a specific temperaturean unsaturated solution is one in which more solute can be dissolved in a specific solvent at the same specific temperature- using the particle theory, SATURATION MEANSthe attractive forces between the particles becomes balanced and no more particles of the solute can be attracted by the particles of the solvent
13Beyond the Limit: Supersaturated Solutions a solution that contains more solute than would normally dissolve at a certain temperature is called a super-saturated solution.
14Cleaning Up with Solvents Not all solutes will dissolve in solvents. Insoluble means not able to be dissolved in a particular solvent.- certain solvents are used for special circumstances because they will dissolve some solutes that water and other solvents cannotWhat does it mean to be insoluble?
15Cleaning Up with Solvents (rubbing alcohol is use to dissolve chlorophyll - grass stains, because the particles have strong attractions)Water will not dissolve oil or products that are oil based.Mix an emulsifying agent with the water (phosphate based soap) and the oil will then dissolve when the clothes are washed.Why will soap clean oil when it is added to water?
16Topic: Solutions and Solubility As well asPercent ConcentrationORWHAT DOES IT MEAN IF A SOLUTION IS SATURATED!
17What is a solution? Solution is homogeneous Composed of a solvent and a soluteIf a liquid solution the solvent is usually liquid and the solute solidIf it is a solution that is a solid solution like Brass, the solvent is the greater quantity and the solute is the lesser quantity
18SolubilityDEFn: The maximum amount of solute that can dissolve in a specific amount of solvent usually at a specific temperature.g of solute100 g 200C
19Saturated and Unsaturated A saturated solution contains the maximum amount of solute that can dissolve.Undissolved solute remains.An unsaturated solution does not contain all the solute that could dissolve
20Learning Check S1At 40C, the solubility of KBr (Potassium Bromide) is 80 g/100 g H2O. Indicate if the following solutions are(1) saturated or (2) unsaturatedA. ___60 g KBr in 100 g of water at 40CB. ___200 g KBr in 200 g of water at 40CC. ___25 KBr in 50 g of water at 40C
21Solution S1At 40C, the solubility of KBr is 80 g/100 g H2O. Indicate if the following solutions are(1) saturated or (2) unsaturatedA. 2 Less than 80 g/100 g H2OB. 1 Same as 100 g KBr in 100 g of waterat 40C, which is greater than its solubilityC. 2 Same as 60 g KBr in 100 g of water,which is less than its solubility
22Temperature and Solubility of Solids Temperature Solubility (g/100 g H2O)KCl(s) NaNO3(s)0°20°C50°C100°CThe solubility of most solids (decreases or increases ) with an increase in the temperature.
23Temperature and Solubility of Solids Temperature Solubility (g/100 g H2O)KCl(s) NaNO3(s)0°20°C50°C100°CThe solubility of most solids increases with an increase in the temperature.
24Temperature and Solubility of Gases Temperature Solubility (g/100 g H2O)CO2(g) O2(g)0°C20°C50°CThe solubility of gases (decreases or increases) with an increase in temperature.
25Temperature and Solubility of Gases Temperature Solubility (g/100 g H2O)CO2(g) O2(g)0°C20°C50°CThe solubility of gases decreases with an increase in temperature.
26Learning Check S2A. Why would a bottle of carbonated drink possibly burst (explode) when it is left out in the hot sun ?B. Why would fish die in water that gets too warm?
27Solution S2A. Gas in the bottle builds up as the gas becomes less soluble in water at high temperatures, which may cause the bottle to explode.B. Because O2 gas is less soluble in warm water, the fish may not obtain the needed amount of O2 for their survival.