Co-Lab Session

Periodic Trends

100

What element has highest ionization energy?

F

200

What is ionization energy?

The minimum energy required to remove the most loosely bound electron from the outermost shell of an atom

300

Compare the elements Al, Cl, S, and Si. Place the elements in order of increasing electron affinity.

Al < Si < S < Cl

400

Why is francium the largest atom on the periodic table?

- atomic radius

- electron affinity

500

Elements A and B have the electron configurations shown below:
A = [Kr]4s²
B = [Ar]3d¹⁰4s²4p⁵

Which element has the larger radius?

A (Calcium)

Thermochem

100

What is heat measured in?

Joules

200

What is entropy?

- S

- disorder

300

A 0.75 g sample of KCl is added to 35.0 g water in a Styrofoam cup and stirred until it
dissolves. The temperature of the solution drops from 24.8 to 23.6^oC. Is the process
endothermic or exothermic?

Endothermic

400

Is the formation for Br- (g) from Br2 (g) an endothermic or exothermic process?

Br₂ (g) --> 2Br (g) deltaH = +193 kJ/mol

Exothermic

500

The standard enthalpy of formation of NH3 (g) is -46.11 kJ/mol. What is the deltaH^o_rxn for the
following reaction?
2/3 NH₃ (g) --> 1/3 N₂ (g) + H₂ (g)

30.74 kJ

Conversions

100

How many mg in 1 kg?

1,000,000

200

How many sig figs in the following?

24.6 + 18.35 -2.98 = ?

3 (ans = 40.0)

300

Perform the following conversion:

981 cm³ = _____ L

0.981 L

400

How do I convert moles to molecules?

Multiply by Avagadro's Constant

500

Convert the following: 1.109 atm into mmHg

842.8 mmHg

Lewis Structures

100

Represent bonding between the following pair of elements, and is the bond ionic or covalent? B and Cl

Covalent 

200

Using VSEPR Theory, predict the geometric shapes of the following molecule: HCN

Linear

300

Write the Lewis Structure for Barium Sulfide

see ipad

400

Only one of these Lewis Structures is correct. Select the correct one and indicate the errors in the others

see board / ipad 

500

Using VSEPR Theory, predict the geometric shapes of the following molecule: NO₃^-

Trigonal planar

Quantum

100

What is the unit for frequency?

Hertz (Hz)

200

Describe the wavelength & frequency of X-rays compared to visible light?

- Higher frequency

- Shorter wavelength

300

What is Heisenburg's uncertainty principle?

We cannot know both the position and speed of a particle, such as a photon or electron. The more you know about one component, the less you know about the other.

400

Write the electron configuration of Pb

[Xe]4f¹⁴5d¹⁰6s²6p²

500

What is the energy of a wave with 455 nm of radiation?

4.36 x 10^-7 J