Quick Quizzes

Newton

• What is Newton’s 1st law?• What is Newton’s 2nd law?• What is Newton’s 3rd law?

Who is this?

How do computers work?

Which computer components do the following?• Provide short term storage• Provide long-term storage• Allow the communication

between components• Perform calculations

Binary

• What is the binary number 1110 in decimal?

• What is the number 10 in binary?

Bonds

• Arrange the following bonds in order of length:

• C-Br• C-F• H-H• C-H• H-O-HOH2 hydrogen bond• C-C• C=N• C=C in benzene

Bonds

• Arrange the following bonds in order of length:

• C-Br (1.94 Å)• C-F (1.37 Å)• H-H (0.74 Å)• C-H (1.09 Å) • H-O-HOH2 hydrogen bond (1.97 Å)• C-C (1.54 Å)• C=N (1.25 Å)• C=C in benzene (1.40 Å)

Bonds

• Arrange the following bonds in order of length:

• H-H (0.74 Å)• C-H (1.09 Å) • C=N (1.25 Å)• C-F (1.37 Å)• C=C in benzene (1.40 Å)• C-C (1.54 Å)• C-Br (1.94 Å)• H-O-HOH2 hydrogen bond (1.97 Å)

Maxima and minima

On this contour map find:

• A maximum• A minimum• A saddle point• A point where the

gradients are zero (in all dimensions) and the second derivatives are all negative

Boltzmann

• What does the Boltzmann equation tell us?

• What is it?

• What are Ni and Nj?• What happens to Ni/Nj if we make

the system hotter?• What is kT at 298 K?

2.479 ≅ 2.5

What is a force field?

Bonding

• Draw the expected potential energy curve for two atoms that are bonded together

• What units would you expect to see on the axes?

• What does the minimum energy point represent?

• Why can we approximate the atom bonding potential with a quadratic function?

Force - fields

• What is a ‘United Atom’ force field?

• Why would you use one?• What is a class one force

field?• What are ‘cross terms’

Vectors and scalars

• Are the following vector or scalar quantities?

• Mass• Velocity • Acceleration• Momentum• Dipole moment• Volume• Time

Vectors

V1 = 2i + 4j +12k

V2 = 5i - 3j + 6k

• What are i, j and k?

• Solve:V3 = V1 + V2

V4 = 2V1

|V4|

Dipoles

• Order by size of dipole moment (gas phase)

• Water• Carbon dioxide• Sodium iodide• Chloroform

Electrostatics

• Name this equation• Describe the terms in the

equation