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Heat Transfer
Molecular Shape/Polarity
Solubility
Concentration
Ionic Compounds
100
What phase change involving the liquid state and the gas state and overall is endothermic?
vaporization/evaporation
100
What is the molecular shape of CH4 a- Trigonal b-Tetrahedral c-Trigonal Pyramidal d- Linear....maybe???
b- Tetrahedral
100
Which of these two will dissolve readily in water? Hexane or Table salt?
Hexane....
100
What is the molarity of a solution containing 250g of NaCl in 500mL of water? a-0.5 M b-8.55M c-500M d-0.855M
b-8.55M
100
Which of these compounds contains ionic particles a- CH4 b-CCl4 c-MgO d-CO2
c-MgO
200
Which phase or state of matter has particles moving at the slowest rate? a-Solid b-Liquid c- Gas d- What is a phase???!
a-Solid
200
Which of these compounds can dissolve in water a- CCl4 b-CH3-CH2OH c-CH3CH3 d-None of these obviously!
b- CH3-CH2OH, That's right!
200
Which has the biggest enthalpy? NaCl or MgO?
MgO....
200
What is the mass% of the solution containing 25g of NaBr in 75g of water? a-25% b-33% c- I don't care...! d- 75%
a-25%
200
The Van't Hoff factor , i , for C6H12O6 a- 12 b-I have a feeling I know this one....just can't remember! c- 2 d-1
d-1
300
Which of these processes involves an increase in entropy? a- H2O(l)----> H2O (s) b-H2O(l)----> H2O (g) c-H2O (g)----> H2O (l) d- Someone tell me what's going on...!
b-H2O (l)----H2O (g)
300
Which of these two molecules has higher boiling point? NaCl or CH3CH2OH
NaCl
300
Which of these has the lowest entropy? MgO or AlN
AlN
300
For a concentration problem about a 23% mass solution, which assumption is best? a- 23g of solute per 100g of solvent b- 23g of solute per 77g of solvent c- 23 g of solute per 100g of solution d - Both b and c
B and c ....Yep!
300
The Van't Hoff Factor for MgCl2 is a- 1 b-2 c-3 d- infinity....maybe??
c-3
400
What equation (s) will you use to find out the energy needed for a heat transfer with a phase change (s---l) a- q=m x C (s)x (T2-T1) , q=nC , q= m x C (l) x (T3-T2) b- q=m x C (s)x (T2-T1), q=nC c- q= m x C(s) x (T2-T1), q= m x C(l) x (T3-T2) d- q=nC
a) All of them
400
Which of these molecules is polar? CH3CH2CH2OH or CF4
CH3CH2CH2OH
400
For gases, the general rule is that decreasing the temperature results in lower solubility. T/F
False...
400
For a concentration problem about a 2.5 M solution with a density 1.8 g /mL, which assumption will help you find mass%? a- 2.5g of solute per 1L of solution b-2.5 moles of solute per 1L of solution c- 1mL of solution weighs 1.8g d- Both b and c.
Both b and C
400
What kind of ion does Al usually forms? a-Al + b-Al 2+ c- Like I care....! d-Al 3+
d-Al 3+
500
If A+B---->C+D Change in Enthalpy= +43 KJ, then C+D----> A+B Cahnge in Enthalpy equals a- How would I know???? b- - 43KJ c- +43KJ d- 0 KJ
b- -43KJ
500
Which of these molecules doesn't contain any polar bonds a-F2 b- CCl4 c-H2O d-BF3
F2
500
Which will dissolve in water better... CH3CH2CH2CH2OH and CH3CH2OH
CH3CH2OH
500
What is the mole fraction of solute for a solution containing 2.5 g of NaCl in 36g of water? a-What was mole fraction again??? b-0.0325 c-0.0209 d-0.0125
The answer is c- 0.0209
500
Which of these are ionic compounds (salts?) a- CaSO4 b-NH4NO3 c-AlN d-All of these
d- All of These