23-2 Quiz Chemistry (insight) ?

[HannahDavis]

Correct Incorrect Ungraded
1.
What is the new freezing point (T2) of water (normal freezing point T1 = 0°C) if 50.0 g of ethylene glycol (Molar mass=62g/n)(d.f.=1) is in a 1 liter solution?
A) 1.5 °C
B) -1.5 °C
Feedback: Correct!
C) 15 °C
D) 101.5 °C
Points Earned: 1.0/1.0
Correct Answer(s): B


Correct Incorrect Ungraded
2.
What would the freezing point depression be for 1M CaCl2 water solution (kf H2O=1.86°C/M)? Remember the freezing point depression equation: ?Tf = M•d.f.•kf.
A) 5.6 °C
Feedback: Correct!
B) 56 °C
C) 1.56 °C
D) 0.62 °C
Points Earned: 1.0/1.0
Correct Answer(s): A


Correct Incorrect Ungraded
3.
What is the new freezing point (T2) if 25g of NaCl (Molar mass NaCl = 58.5g/mol) is dissolved into 1.0 L of water (kf H2O=1.86°C/M)?
A) 1.6 °C
B) -101.6 °C
C) 101.6 °C
D) -1.6 °C
Feedback: Correct!
Points Earned: 1.0/1.0
Correct Answer(s): D


Correct Incorrect Ungraded
4.
How many grams of C6H12O6 is needed to reduce the freezing point of .025 L water to -2.5 °C?
A) 6075 g
B) 1.8 x 10-4 g
C) 6.1g
Feedback: Correct!
D) .6 g
Points Earned: 1.0/1.0
Correct Answer(s): C


Correct Incorrect Ungraded
5.
Based on disassociation factors, which of these will have the greatest freezing point depression?
A) 1M CaCl2
Feedback: Correct!
B) 1M NaCl
C) 1M MgSO4
D) 1M C6H1206
Points Earned: 1.0/1.0
Correct Answer(s): A
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