Solution to your Mixture
Concentrate!
Solubilibility
Sorry to Separate
Miscellaneous
100
What is the difference between Mixtures and Pure Substances?
Mixtures can be separated by physical methods, while Pure Substances cannot. Mixtures have variable compositions as well, while Pure Substances are uniform.
100
What does "Concentration of a Solution" mean specifically?
How much solute there is in a given amount of solvent or solution.
100
What is solubility for solutes?
It is the maximum amount of solute that can be dissolved into a solvent, usually at a given temperature.
100
What are the 3 methods of separation in your book for heterogenous mixtures?
Magnetic Separation, Filtration, and the Use of a Separating Funnel
100
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7
200
Give 3 examples of Pure Substances.
Answers will vary. We're looking for substances that are not mixed. Water, Salt, Iron, etc.
200
Calculate the mass percentage of a solution containing 10 g of salt and 90 g of water
10% of salt
200
Explain saturation using ColaCao (or Cacaolat).
If you put ColaCao powder into milk endlessly, eventually the milk will stop absorbing the powder, which is the saturation point. Adding powder after will keep the powder as powder.
200
What are the 3 methods of separation in your book for homogenous mixtures?
Distillation, Evaporation/ Crystallization, and Chromatography
200
What is an alloy? Give an example of an alloy.
Alloys are mixtures but both parts are solids. Usually mixing elements result in a new metal alloy. Examples include Bronze, Steel, Brass, Sterling Silver, Red Gold. White Gold, and Pewter.
300
What is the Solvent and Solutes in Orange Fanta?
The Solvent is water. The Solutes are Carbon dioxide, creating the fizz, sugar, orange juice...
300
What are the formulas to discover Mass Percentage and Volume Percentage of a Solute?
Mass/ Volume of Solute
--------------------------- X 100
Mass/ Volume of Solution
300
Describe "Solubility Curves", and how temperature usually affects solubility.
Substances can dissolve better or worse with different temperatures. Solubility curves on graphs show how solubility changes as temperature changes.
300
In movies where people are stranded on desert islands, sometimes they boil sea water and catch the steam in bottles. What process is being used in these movies?
Evaporation and Crystallization.
300
Match each item of laboratory equipment with the separation technique:
Material: Crystallising dish, magnet, funnel, condenser, paper strip
Technique: Distillation, chromatography, magnetic separation, crystallisation, filtration
Cristallising dish:Crystallization
Magnet: magnetic separation
Funnel: filtration
Condenser: distillation
Paper strip: chromatography
400
Explain the difference between Heterogenous Mixtures and Homogenous Mixtures.
Heterogenous Mixture components can be distinguished with the naked eye, while Homogenous Mixtures cannot be.
Heterogenous Mixtures compositions and properties are different at separate points in the same mixture. Homogenous Mixtures are the same all through out.
400
What is the formula to find Mass Concentration of a Solute in a Solution?
Mass of Solute (g)
g/L= -------------------------
Volume of Solution (L)
400
Calculate the solubility of KClO3 at 70ºC
30 g/100g of water
400
Choose a method of separation for heterogenous mixtures and explain it's process.
Check with Alvaro to see if its correct.
400
Explain what happens with the solubility of gases when temperature increases. What is the relationship of this with the discharges of hot water from some industries into rivers? What problems does this cause aquatic organisms in the water in relation to oxygen?
Solubility of gases decreases with temperature, so in hot water oxygen dissolves less. Therefore, there'll be less oxygen available and the organisms can die.
500
Identify 3 Homogenous and Heterogenous mixtures in our everyday life.
Homogenous: Colacao, Salt Water, Soda, Callimocho
Heterogenous: Sand and Water, Salads, Fried Rice, Paella, Boba Tea
500
A bottle of rubbing alcohol states on its label it has an alcohol by volume of 80º, If the bottle contains 80 mL of liquid, How many milliliters will be of alcohol?How much will be water?
64 mL of alcohol and 16 mL of water
500
If we dissolve 70 g of K2Cr2O7 at 100ºC Calculate the amount of K2Cr2O7 that will appear as a precipitate if we cool down the solution to 50ºC
At 50ºC the solubility is 30g/100g water so 40 g of the solute will precipitate (70-30)
500
Choose a method of separation for homogenous mixtures and explain it's process.
Check with Alvaro to see if its correct.
500
Explain step by step how would you prepare a 100 g solution of salt in water at 1% by mass (assume de density of the solution is the same as water 1g/mL)
1. Calculate the mass of salt: we need 1 g of salt
2. Weigh the mass of salt with a balance
3. Add a little water to the solute and stir until salt is dissolved
4. Using a funnel, pour the solution into a volumetric flask of 100 mL and add water until the mark