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Advanced Chemistry > Unit 2 Test Review > Flashcards

Unit 2 Test Review Flashcards

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1
Q

What is the equation for molarity?

A

M= moles of solute/liters of solution

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2
Q

A solution is prepared by dissolving 24.9 g of CaCl2 in 210 mL of solution. What is the molarity?

A

1.1 M

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3
Q

A solution contains 12.9 g of Na2SO4 in 325 mL of solution. What is the molarity?

A

0.28 M

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4
Q

Consider 670 mL of a 4.1 M solution of Mg(NO3)2 setting in a beaker. If you evaporate all 670 mL of the solution, how many grams of solute would be left in the beaker?

A

400 g

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5
Q

What is the equation for molality?

A

m= moles solute/kg solvent

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6
Q

1 kg of water = ?

A

I L

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7
Q

1 g of water = ?

A

1 mL

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8
Q

What is the molality of a solution that is made by dissolving 32.6 g of Na2SO4 in 475 g of water?

A

0.48 m

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9
Q

What is the equation for mole fraction?

A

Xsolute= mol solute/(mol solute + mole solvent)!

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10
Q

What is the mole fraction of nacl when 14.25 g of nacl is dissolved in 85.0 g of H2O.

A

0.1

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11
Q

Calculate the mass percent of Na3PO4 if 12.5 g of it are dissolved in 250 mL of water.

A

4.76%

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12
Q

In colder climates during the winter, people put salt on the roads and walkways to melt ice. Why do people do this? Why does salt melt ice?

A

Because salt lowers the freezing point so that water will not freeze until much lower temps

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13
Q

A solution is prepared by dissolving 45.7 g of Na2CO3 in 200 g of water.

a) what is the molality?
b) what is the total molality of all the particles in the solution?

A

2.15 m; 6.48 m

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14
Q

Change in boiling point equation?

A

🔼T= (mT)(Kbp)

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15
Q

What is the boiling point elevation constant?

A

0.515

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16
Q

What is the freezing point depression constant?

A

1.853

17
Q

What is the freezing point of a 2.5 m solution of salt water?

A

-9.3

18
Q

Do you subtract from 0 or add to 100 with freezing point?

A

Subtract from 0

19
Q

Do you subtract from 0 or add to 100 with boiling point?

A

Add to 100

20
Q

Dilution causes the concentration of an unsaturated solution to

A

Decrease

21
Q

Evaporation causes the concentration of an unsaturated solution to

A

Increase

22
Q

What is the concentration?

A

Amount of solute per solvent

Advanced Chemistry (4 decks)

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