Chapter 20
A beta particle
What is ⁴₂He ?
What is the value of [N₂] at equilibrium? At equilibrium, [H₂]= 2.0M & [NH₃]= 0.5M. Kc= 2
N₂(g) + 3H₂(g) ⇌ 2NH₃
What is 0.016M ?
The conjugate base of H₂SO₄ is...
What is HSO₄⁻ ?
Of the acids in the table below, ________ is the strongest acid.
Acid Ka
HOAc 1.8 × 10-5
HCHO2 1.8 × 10-4
HClO 3.0 × 10-8
HF 6.8 × 10-4
What is HF 6.8 × 10-4 ?
The name for HNO3 is...
Nitric acid
What would protect you from an alpha, beta, and gamma particle?
Alpha: paper
Beta: wood
Gamma: Pb or concrete
If Q>K, the reaction must shift to the...
Left, The reaction has a higher concentration of products than it should at equilibrium, so it shifts to the left to form more reactants.
The conjugate acid for OH⁻ is...
What is H₂O ?
The Ka for HCN is 4.9 × 10-10
The value of Kb for CN- is...
What is 2.0 × 10-5 ?
How much of a corner atom is in a cubic cell
What is 1/8th ?
A positron
What is ⁰₊₁e ?
A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g) H2(g) + I2(g)
When the system comes to equilibrium at 425 °C, PHI = 0.708 atm, and PH2 = PI2 = 0.0960 atm.
The value of Kp at this temperature is ________
What is 1.30 × 10-2 ?
The concentration (in M) of hydronium ions in a solution at 25.0 °C with a pOH of 4.223 is...
What is 1.67 x 10⁻¹⁰ ?
Using the data in the table, which of the conjugate bases below is the strongest base?
Acid Ka
HOAc 1.8 × 10-5
HC7H5O2 6.3 × 10-5
HNO2 4.5 × 10-4
HF 6.8 × 10-4
A) NO2-
B) C7H5O2-
C) F-
D) OAc-
E) OAc- and C7H5O2-
What is D) OAc- ?
Calculate the [OH-] and pH for a 0.10 M NaF solution. The Ka for HF is 6.8 x 10-4
[OH-] = 1.2 x 10-6 M
pH= 8.08
The missing particle in the following reaction
²³⁵₉₂ U + ¹₀ n --> ___ + ⁹³₃₆Kr + 3 ¹₀n
What is ¹⁴⁰₅₆Ba ?
The effect of a catalyst on an equilibrium is to ________.
A) increase the rate of the forward reaction only
B) increase the rate at which equilibrium is achieved without changing the composition of the
equilibrium mixture
C) increase the equilibrium constant so that products are favored
D) shift the equilibrium to the right
E) slow the reverse reaction only
What is B) increase the rate at which equilibrium is achieved without changing the composition of the
equilibrium mixture ?
The pOH of a solution at 25.0 °C that contains
1.94 × 10⁻¹⁰ M hydronium ions is...
A 0.1 M solution of ________ has a pH of 7.0.
A) KF B) NaF C) NaNO3 D) NH4Cl E) Na2S
What is C) NaNO3?
The Ka of acetic acid (HC₂H₃O₂) is 1.8 × 10⁻⁵.
The pH at 25.0 °C of an aqueous solution that is 0.100 M in acetic acid is...
The % ionization is...
What is 2.87?
What is 1.34%?
The radioactive isotope ³²P decays by first-order kinetics and has a half life of 14.3 days. How long does it take for 95.0% of a sample of ³²P to decay?
61.8 days
In which of the following reactions would increasing pressure at constant temperature not change
the concentrations of reactants and products, based on Le Châtelierʹs principle?
A) N2 (g) + O2 (g) <-/-> 2NO (g)
B) N2 (g) + 2O2 (g) <-/-> 2NO2 (g)
C) 2N2 (g) + O2 (g) <-/-> 2N2O (g)
D) N2 (g) + 3H2 (g) <-/-> 2NH3 (g)
E) N2O4 (g) <-/-> 2NO2 (g)
What is A) N2 (g) + O2 (g) <-/-> 2NO (g) ?
An aqueous solution contains 0.150 M HCl at 25.0 °C. The pH of the solution is ________
What is 0.82 ?
The products of an acid base reaction are...
A 0.10 M solution of a weak acid, HA, has a pH of 3.25 at 25 °C.
The acid-dissociation constant (Ka) for HA is...