Gen chem 2009 ada

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virtualmaster999

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Hi all!

Could someone help me with these 3 gen chem problems from 2009?

44) 50mL of H2SO4 and 50mL of 1M NaOH. They give you the equation: 2NaOH +H2SO4-> Na2SO4 +2H2O
-Do you not need to use the equation? I used the formula for neutralization.

59) Which is not true of ionic compounds in the solid state?
-hard
-brittle
-break with definite faces
-exist as crystalline solids
-good conductors of electricity.

68) The volume of an ideal gas approaches zero as the T approaches:
-273K
-273 C
0 C
0 F
212 F

Thanks in advance!!

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Hi all!

Could someone help me with these 3 gen chem problems from 2009?

44) 50mL of H2SO4 and 50mL of 1M NaOH. They give you the equation: 2NaOH +H2SO4-> Na2SO4 +2H2O
-Do you not need to use the equation? I used the formula for neutralization.

59) Which is not true of ionic compounds in the solid state?
-hard
-brittle
-break with definite faces
-exist as crystalline solids
-good conductors of electricity.

68) The volume of an ideal gas approaches zero as the T approaches:
-273K
-273 C
0 C
0 F
212 F

Thanks in advance!!

44/ Yes, you do need to use the equation to determine their mole ratio.
moles of NaOH = 0.05
moles of H2SO4 needed to complete neutralize NaOH = 0.05/2 = 0.025 (You divide by 2 because for every mole of H2SO4, you need 2 moles of NaOH)
molarity of H2SO4 = 0.025/0.05 = 0.5

59/ Ionic compounds in their solid state do not conduct electricity because the ions are held fixed. However, in their aqueous and molten state, they can because the ions are free to move around.

68/ Ideal gas law PV = nRT, as V approaches zero, T approaches zero KELVIN or -273C
 
44/ Yes, you do need to use the equation to determine their mole ratio.
moles of NaOH = 0.05
moles of H2SO4 needed to complete neutralize NaOH = 0.05/2 = 0.025 (You divide by 2 because for every mole of H2SO4, you need 2 moles of NaOH)
molarity of H2SO4 = 0.025/0.05 = 0.5

59/ Ionic compounds in their solid state do not conduct electricity because the ions are held fixed. However, in their aqueous and molten state, they can because the ions are free to move around.

68/ Ideal gas law PV = nRT, as V approaches zero, T approaches zero KELVIN or -273C
Thank you so much! Also, would you mind helping me with one more question from orgo:

"What technique is used to separate nonvalitle substances"
-TLC
-Gas Liquid chrom.
-sublimation
-distillation
-steam distillation

Why is it TLC? Which would be for volatile then??
 
Thank you so much! Also, would you mind helping me with one more question from orgo:

"What technique is used to separate nonvalitle substances"
-TLC
-Gas Liquid chrom.
-sublimation
-distillation
-steam distillation

Why is it TLC? Which would be for volatile then??

I think for volatile you would have to use something involving the gas phase (gas liquid chromatography or distillation). TLC is best for separating nonvolatile substances (just separates based on polarity)!
 
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I think for volatile you would have to use something involving the gas phase (gas liquid chromatography or distillation). TLC is best for separating nonvolatile substances (just separates based on polarity)!
Thank you!
 
  • Like
Reactions: 1 user
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