Unit 3
Acid/Base
Equilibrium
Definitions
lazy
100

Hydrogen bonding can occur when the following conditions are met.

Condition 1: The compound is polar
Condition 2: Hydrogen is bonded to either F, O, or N.

100

What does an acid do in an acid-base reaction

Donates a proton/proton donater

100
aAg+bB(s)<->cC(aq)+dD(s)​

Write the equilibrium constant 

​​​
Kc=Aa/Dd
100

What is bond length

The distance between nucleuses of 2 bonded atoms at the point of minimum potential energy 
100

What is this element?

SI

silicon 

200

2 A2(g)+4 B(g)-> 4 AB(g)
Initial volume of : A2(g) 1.0 L : B(g) 0.5L
Temp: 40 C.
Initial Pressure: A2(g) 40 atm : B(g) 16 am.

What is final pressure. Correct sig figs and units required

1.6 mols A2, 0.31 mols B. B is limiting
1.4 mols of A2 left, 0.31 mols of Ab created
Total moles: 1.7
Final pressure and sig figs: 29 atm

200

PH of KOH at 25 C and 0.025 M

PH = 12.4

200

According to Le Chatelier’s Principle, what happens to the equilibrium position if the concentration of a reactant is increased?

Shifts to products

200

What is polarizability

The capability of which a molecule's electron cloud to be disturbed, increasing electrons

200

Molar mass of H2O with units

18.0 g/mol

300

Why do some molecules dissolve better in water than others? (Best answer wins)

Polarity/Like dissolves like. Hydrogen bonding.

300

If you are given a titration graph (POH vs volume of acid) of a weak base - strong acid. How do you find PKa

Half equivalence point then 14-Pkb

300

If Q > K, in which direction will the reaction proceed to reach equilibrium? and why?

Reactants, too much product

300

What is rate law?

This relates the rate of a chemical reaction to the concentration of its reactants, raised to a specific power.

300
name the 6 strong acids

HCl, HNO3, HBR, HI, H2SO4, HCIO4

400

The stationary phase of a paper chromatography is non-polar while the mobile phase is polar.

Which molecule would be closest to the starting point of the stationary phase? Explain
CCl4 or NH3

CCL4, nonpolar
400

For a weak acid, HA, the Ka is 1.0*10-5. What is its conjugate base and its Kb. Temp is 25 C

A- and 1.0*10-9

400

How does an increase in pressure affect the equilibrium of a gas-phase reaction?

It shifts the equilibrium toward the side with the fewer moles of gas.

400

What is first ionization energy

energy required to remove one mole of electrons from one mole of gaseous atoms in the ground state.

400

What are we scoring tomorrow on the AP Chemistry Exam?

a combined score of 0
500

Explain why HF has a significantly higher boiling point than HCl.

HF has hydrogen bonds where HCl don't
500

NH3 + H2O <-> ? + ?
Identify acid/base pairs
If Ka=10-9 then what is the strongest acid? Base?

NH3 (base)-NH4+ (Conjugate acid)
H2O (acid)-OH- (Conjugate base)|
NH4 strongest acid
OH- strongest base

500

How does a temperature increase affect the K value of an exothermic reaction?

The K value decreases (equilibrium shifts toward reactants).

500

What is an interstitial allow and when does it occur

type of alloy is formed when smaller atoms fill the holes in a metallic lattice of larger atoms.

500

In a weak acid - strong base reaction. Before the half equivalence point, is there more of less conjugate base?

less conjugate base

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