Ask Mr. LG anything! (ALMOST)

1. Ask Mr. LG anything! (ALMOST) By Mr. Lang

2. Questions-705 • How does distillation work? A- 2 processes- evaporation and condensation. Solvent and solute is retained. In paper chromatography, when you say that the colours separate on the filter based on the solubility of each different colour, what do you mean by “solubility”? A- Paper chromatography- each colour has a different ATTRACTION to the solvent and the filter. The more attraction, the farther the colour will travel.

3. For pure substances and mixtures, is water considered pure? A- Based on its overall appearance, we would classify it as a pure substance. What is the relationship between solubility and the particle theory? A- solubility is a measure of how easy a solute dissolves in a certain solvent. If something dissolves easily, it means that the particles have a high attraction to each other.

4. Why is walking through a liquid easier than walking through a solid? A- In a solid the particles are packed tightly together unlike the particles of a liquid or gas. Solids have a stronger force of attraction so we cannot walk through them. What if we mix 2 things together and they look the same? What do we do to separate them back? A – we can use evaporation, distillation or in some cases, paper chromatography to separate solutions

5. How can we separate salt and sugar? • A- First, add water. We could use distillation twice and that would help us separate salt and sugar. It would be vey time consuming. • What is the difference between a solution, solvent and a solute? • A- a solution is a mixture of a solute and a solvent. a solute is a substance that dissolves in a solvent. A solvent is a substance used to dissolve a solute.

6. Why does heat make particles faster? A- Heat provides the particles with kinetic energy. Particles use the kinetic energy for movement. The more heat there is, the faster the particles will move.

7. 1. what is the best and easiest way to separate mechanical mixtures? • There is no specific way • Depends on what you are seperating • Separate sand and gravel.. You have to look through all the techniques and use the best technique… Sifting is the easiest way to take the sand away and leave gravel behind.

8. What is a dilute solution? • A dilute solution is where the amount of solute is very low compared to solvent. • Best example: sugar in water.. Lots of water and little sugar

9. What does super-saturation and saturation mean and what is the difference? • Saturation: the point in which the solvent is full of solute • Super-saturated: add heat and the heat allows you to go beyond full. More than is usually would hold. This is caused by the heat. By heating it 1 water particle can hold 2 sugar particles instead of 1 to 1

10. Name all of the separation methods • 1. sorting • 2. sifting • 3. magnetism • 4. filtration • 5. paper chromatography • 6. distillation • 7. evaporation

11. What sheets do we need to study? • Big idea: particle theory- very important!!!! • Separating solutions and mechanical 60- 70 percent of test!!!!! • How is it possible to walk through gas and liquid but not solid • Liquids and gases have spaces between them but solid don’t and they are compact • Particles in solid are compact which is the opposite of gas and liquid and the particles spread out for liquid and gas

12. What is the difference between evaporation and distillation? • Evaporation= change in state from liquid to gas due to addition of heat • The purpose of evaporation is to separate solvent and solute but you lose the solvent and that is the down side. • Distillation= it is a 2 step process. First step is evaporation but with our second step we can get our solvent back with condensation Down side is its expensive

13. How does distillation work and where can it be used and why • Distillation is a two step process. • First step evaporation • Second step Condsention • You are separating a solute from a solvent\ • Example if you want to separate sugar from water • In this the pro is you save the Solute/solvent. Down side, lots of time and money • Evaporation , fast and easy and cheap

14. How can questions relate to the particle theory? • Why is it possible to walk through a liquid or a gas but not a solid. Use Particle theory. • The motion in liquids and gases move faster compared to solids. • The particle distance are farther apart. • In a solid the particles are together and no space for them to move apart.

15. Name some ways of separating mixtures. • Sorting • Paper chromatography • Distillation • Magnetism • Flirtation • Sifting • Evaporation

16. Explain how Paper chromatography works? • The chemicals in the solution have different sizes and attraction to the solvent and the filter. • If you are really attracted to water you will travel all the way to the top with it.

17. What is the difference between a Homogeneous and a Heterogeneous mixtures? • Homogeneous is a another fancy word for solution or a Pure Substance. • Heterogeneous is another word for a Mixture.

18. For Pure substances and mixtures are we supposed to say water is pure? • Yes for our purposes water and example olive oil are considered pure based simply on their appearance. • All elements are pure. • Air for our purposes is considered as a mixture.

19. What sheets do we need to study from? • What are the six parts of the Particle Theory of Matter. • The two slides that talk about separating mechanical mixtures and solutions. • Study your Concentration sheet.

20. What is a solution? A solute? A Solvent what is concentration what is solubility? • A Solute is the thing that gets dissolved. • A Solvent is the thing that does the role of dissolving the solute. • A Solution is basically a solute and solvent together. • A Concentration is how much solute there is compared to Solvent. Example: Saturated ( full or maximum) • Solubility is a measure of how easy it is to dissolve something