Study Material Preparation AMS and homework week 1 Term 2 Level L 2021 Part 1


Week 1 Term 2 Level L 2021

 

 

Part 1 Chapter 6

The Condensed Phases of Matter

1. Define solution.

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 A solution is a homogeneous mixture that contains more than one substance.

2. At the same temperature which molecules are on the average likely to have the highest kinetic energy?

a) Gaseous molecules.

b) Solid molecules.

c) Liquid molecules.

d) Heaviest molecules.

e) Molecules of all states and types will have the same average KE.

(since they are at the same T)

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2. At the same temperature which molecules are on the average likely to have the highest kinetic energy?

a) Gaseous molecules.

b) Solid molecules.

c) Liquid molecules.

d) Heaviest molecules.

e) Molecules of all states and types will have the same average KE.

(since they are at the same T)

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14. a) What does the term 'the molar concentration of a solution' refers to?

Molar concentration of a solution indicates the number of moles of a solute per dm3 of solution. It is the ratio of moles of solute to dm3 of solution.

b) Is this the same thing as molarity?

Yes.

c) What does it mean to say that the molar concentration of a sugar solution is 0.25 M? It means the solution contains 0.25 mole of the solute per dm3 of solution.

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15. Explain how you would prepare a 2.00 M NaCl, 1.00 L solution. 


a) Calculations: Find the number of moles needed: n = CV = 2.00 × 1.00 = 2.00 mole Find mass needed: m = nM = 2.00 × 58.5 = 117g

b) Laboratory procedure:

1) 117g of NaCl is weighed

2) Add solid to 1.00 dm3 volumetric flask and add some distilled water to dissolve the solid. The mixture is swirled until the salt dissolves completely. 3) Add enough water till the etched mark.

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16. Two liters of 1.0 M NaCl solution is prepared in a flask. 500 ml of solution is poured out of the flask into a beaker. What is the concentration of the salt solution in the beaker?

 

1.0M Nothing has been added to the solution Þ its concentration remains the same.

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17. 0.15 dm3 of 2.0 M NaOH solution is to be prepared in a flask. How many moles of NaOH are required?

n = CV = 2.0 × 0.15 = 0.30 mole

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18. What is meant by the term “solubility”?

Solubility is the concentration of a saturated solution at a certain temperature. It is the concentration of the solution where the maximum of solute is dissolved.

 

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19. What is meant by a “saturated solution”?

 

 A saturated solution is one in which no more solute can dissolve


20. a) What are aqueous solutions?

 

 Aqueous solutions are solutions in which the solvent is water.

 

b) Can you have aqueous solutions where the solute is a solid, a liquid or a gas?

 

Yes

 

Give an example of each case.

 

 

 

 

 

 

 

 

 

1) Salt and water. (a solution of solid in water) 




2) Alcohol and water. (a solution of liquid in water)

3) Carbon dioxide and water. (a solution of gas in water)





 


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