Solutions
What is the molality of a solution made by dissolving 25.0 g of NaCl in 200.0 g of water?
2.1 m
What is the overall reaction order for Rate = k[NO]²[Cl₂]?
3
What is the pH of 0.010 M HCl?
2
If ΔH < 0 and ΔS > 0, what is the sign of ΔG?
Always negative (spontaneous)
Name everyone in the room
*insert names*
What is the percent by mass of NaOH in a solution made by dissolving 15.0 g NaOH in 85.0 g H₂O?
15%
What are the units of k if the rate law is Rate = k[A]²?
k=1/Mt
Given Ka = 1.8 × 10⁻⁵, what is pKa?
4.7
If ΔH = –100 kJ, ΔS = –250 J/K, T = 300 K, calculate ΔG.
-25 kJ
In an electrolytic cell, the anode is reduced or oxidized?
Reduced
What is the freezing point of a solution with 2.0 mol of NaCl dissolved in 1.0 kg of water? (Kf = 1.86°C·kg/mol)
-7.44
If doubling [A] quadruples the rate, what’s the order with respect to A?
2nd order
What is the pH of a buffer with 0.25 M acetic acid and 0.35 M sodium acetate? (Ka = 1.8 × 10⁻⁵)
4.8
What is K if ΔG° = –8.0 kJ/mol at 298 K? (R = 8.314 J/mol·K)
25
How many states of matter are there?
27
A glucose solution freezes at –4.65°C. What is the molality if Kf = 1.86°C·kg/mol?
2.5 m
Calculate Ea if k = 1.5 × 10⁻³ s⁻¹, A = 8.0 × 10⁵ s⁻¹, T = 298 K.
(R = 8.314 J/mol·K)
Around 50 kJ/mol
What is [H+] when pOH is 8.36?
2.29*10^-6 M
For a reaction at 400 K with ΔH = 15 kJ and ΔS = 100 J/K, is the reaction spontaneous?
Yes
what is molality?
n/LITERS
n/MILLILITERS
n/KILOGRAMS
ur mom
n/KILOGRAMS
The vapor pressure if molecule A at 7.6 C is 20mmHg. Find its vapor pressure at 46 . Hvap=37kJ.
135mmHg
What is the half-life of a 1st-order reaction with k = 0.693 s⁻¹?
1
What is the pH of an analyte (25.0 mL HF, 0.1 M) combined with a titrant (50.0 mL NaOH, 0.05 M)?
7.85
Which state of the matter should have the lowest value of entropy of formation ΔS°?
Solid
When is workshop?
TUESDAY NOT MONDAY