Exam 3

Periodic Trends

100

Arrange the following in order of decreasing radius: Br, At Cl, I, F

At>I>Br>Cl>F

200

Arrange the following from smallest to largest radius: O, O^2-, O²⁺

 O²⁺, O, O^2-

300

Arrange the following in order of increasing first ionization energy: Bi, Cs, Ba

Cs < Ba < Bi

400

Which of the following is most metallic: Na, Mg, Al, K, or Ar?

K

500

Arrange the following in order of increasing electron affinity: O, N, F, C

N, C, O, F

Concepts and Thermodynamics

100

Wavelength and energy are _______ proportional

inversely 

200

Name one of the five postulates in Kinetic Molecular Theory

1. Continuous, random motion

2. Volume of gases is negligible

3. Forces between particles are negligible

4. Energy is conserved between particle collisions

5. Average kinetic energy is proportional to absolute temeprature

300

The enthalpy change for the following reaction is -483.6 kJ:

2H₂ (g)  +  O₂ (g)  →  2H₂O (g)

Therefore, the enthalpy change for the following reaction is ________ kJ.

4H₂O (g)  → 4H₂ (g)  +  2O₂ (g) 

967.2

400

Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:
N₂(g) +  2O₂(g)  →  2NO ₂(g)

N₂(g)  +  3H₂(g)  →  2NH₃(g)                                  ΔH = -115 kJ
2NH₃(g)  +  4H₂O(l)  →  2NO₂(g)  +  7H₂(g)          ΔH = -142.5 kJ
H₂O(l)  →  H₂(g)  +  1/2O ₂(g)                                 ΔH = -43.7 kJ

-83 kJ

500

4NH₃(g) + 7O₂(g) ---> 4NO₂(g) + 6H₂O(g)

Given the following standard enthalpies of formation (given in kJ/mol), calculate the enthalpy of the above reaction:

NH₃(g) = −45.90

NO₂(g) = +33.1

H₂O(g) = −241.83

-1135kJ

Gases

100

Lighter gasses effuse more ______, heavier gases effuse more ______

Rapidly, slowly

200

What volume of acetylene gas, C₂H₂, would be required at 0°C and 1 atm to obtain a 100.0 gC₂H₂ sample?

86L

300

 The reaction of 50 mL of Cl₂ gas with 50 mL of  CH₄ gas via the equation:

Cl₂ (g)  +  CH₄ (g)  →  HCl (g)  +  CH₃Cl (g)

will produce a total of ________ mL of products if pressure and temperature are kept constant.

100

400

A sample of gas has a volume of 2.5 L at 30°C and 720 mmHg. What will be the volume of this gas at 22°C and 750 mmHg?

2.3 L

500

The volume of fluorine gas required to react with 4.26 g of calcium bromide to form calcium fluoride and bromine at 25.0 °C and 4195 torr is ________ L

0.0943

Quantum Theory

100

What is the frequency of radiation with a wavelength of 440. nm

6.81 × 1014 s^-1

200

If an electron has the quantum numbers n=3, l=0, what is the value of m_l?

m_l = 0

300

The possible values of the magnetic quantum number, mℓ , of a 3p electron are:

-1, 0, +1

400

What is the smallest acceptable value for the missing quantum number? n= ?, ℓ= 2, m_ℓ= 0, m_s=+1/2

3

500

Arrange the following in order of increasing ENERGY (lowest to highest):UV radiation, visible radiation, X-rays, and microwaves.

microwave < visible < UV < X-rays

Electron Configuration

100

The Pauli Exclusion Principle states that no two electrons in an orbital can have the same ____

spin

200

[Kr]5s²4d¹⁰5p⁵ is the ground state electronic configuration of ________ (neutral element)

I

300

What is the ground state electron configuration for a Cr²⁺ ion?

1s²2s²2p⁶3s²3p⁶3d⁴

400

The ground state electron configuration of Sc is ________

1s²2s²2p⁶3s²3p⁶4s²3d¹

500

The core electron configuration for Br- is ________

[Kr]