Mirco Exam Qs

Question 1

In class, we discussed a ‘core’ anabolic cycle at the origin of life that involves condensation of what molecule with molecular hydrogen to form acetate?

Answer 1

Carbon

Question 2

Which of the four quantum numbers corresponds with the energy level of a ground state atom?

Answer 2

Principal quantum number, n

Question 3

Which quantum number describes the shape of an electron orbital?

Answer 3

Angular momentum quantum number, l

Question 4

Which of the following is the correct electron configuration for lithium (atomic number 3)?

Answer 4

1s^2 2s^1

Question 5

What is the outermost energy level (shell) of an atom called?

Answer 5

Valence shell

Question 6

Lithium, Sodium, and Potassium behave similarly because…

Answer 6

They have similar valence shell configurations

Question 7

What is the electronic configuration of a ground state carbon atom? (atomic number = 6)

Answer 7

1s^2 2s^2 2p^2

Question 8

Potential energy (Joules) = mass (m) * gravity (g) * height (h). A penny weighs 2.5 grams. The upper observation deck at the empire state building is 381 meters from the ground. The standard acceleration due to gravity is 9.8 m/s2. If you dropped a penny from the observation deck, what would its kinetic energy be just before it hits the ground? Be sure that your units are in Joules (kg*m2 / s2).

Answer 8

9.33 kg*m^2/s^2

Question 9

The molar mass of helium is 4.0026 grams/mole. Avogadro’s number is 6.022 * 1023 atoms/mole. The ideal gas constant is 8.314 Joules/mole K. What is the mass (in kg) of a single helium atom?

Answer 9

6.64 * 10^22

Question 10

Which of the following forces is most relevant to the kinetic behavior of gases?

Answer 10

Electromagnetic forces

Question 11

A sealed and insulated can filled with 0.001 mole of helium gas at 25C is placed in the sun and warms to 45C. Given dU = 3/2nRdT, how much energy (in Joules) was transferred to the helium? *To convert Celsius to K, add 273.15.

Answer 11

24.9 Joules

Question 12

Which of the following is not an example of thermodynamic work?

Answer 12

Losing body heat to the cold air

Question 13

Which of the following is not an example of thermodynamic work?

Answer 13

Magnesium

Question 14

The first law of thermodynamics establishes a conservation principle to flows of matter and energy. The second law establishes a BLANK principle.

Answer 14

Directionality

Question 15

The 2nd law tells us that the macrostate of a system reflects the configuration with the BLANK possible microstates.

Answer 15

Most

Question 16

A large difference in electronegativity among bonding pairs of atoms causes the molecule to take on BLANK properties.

Answer 16

Polar

Question 17

For the reaction A + B –> C, which of the following is a correct rate expression for the ‘disappearance’ of A? Note, use the rate constant k (units of 1/second).

Answer 17

-k[A]

Question 18

Chemical equilibrium is the state in which the forward and reverse reaction rates are:

Answer 18

Equal

Question 19

Chemical equilibrium is the state in which the forward and reverse reaction rates are:

Answer 19

Concentration of reactants and products

Question 20

If the equilibrium constant K = 1, the reaction is:

Answer 20

At equilibrium

Question 21

The enthalpy of formation for a H-H bond is: 436 kJ/mol.

The enthalpy of formation for an O-H bond is: 464 kJ/mol.

Estimate the enthalpy of reaction for the hydrogenation of hydroxide to water by molecular hydrogen: OH- + H2 –> H2O.

Answer 21

-28 kJ/mol

Question 22

The standard Gibbs free energy of a reaction: dG = -RTln(K) is spontaneous when:

Answer 22

K&raquo_space; 1

Question 23

Water is amphoteric, which means that water:

Answer 23

Can act as an acid or a base

Question 24

Which of the following does not influence the value of Keq?

Answer 24

Starting concentration of reactants and products

Question 25

Each water molecule can form up to how many hydrogen bonds?

Answer 25

4

Question 26

Which of the following best describes the meaning of the standard Gibbs free energy of reaction

Answer 26

Max of work, as reaction goes completely to equilibrium from standard conditions

Question 27

The conceptual difference between standard Gibbs free energy change of a reaction and the observed Gibbs free energy change of a reaction is:

Answer 27

Standard Gibbs Free Energy is the max of work when the reaction goes completely to equilibrium

Question 28

The geometry of water is bent, due to the presence of oxygen lone pairs, and what orbital hybridization state?

Answer 28

sp^3

Question 29

The law of mass action states that the rate of a reaction is proportional to the:

Answer 29

Concentration of reactants and products

Question 30

The cytoplasm consists of macromolecules suspended in a bulk water fluid in which water is always in excess and contributes primarily to short timescale interactions with macromolecule surfaces.

Answer 30

False

Question 31

Water may contribute to protein function in each of the following ways EXCEPT:

Answer 31

Binding with non-polar residues in the proteins’ internal pockets

Question 32

The pH of pure water is the same at 37 degrees Celsius as it is at 25 degrees Celsius.

Answer 32

False

Question 33

The pH of pure water is the same at 37 degrees Celsius as it is at 25 degrees Celsius.

Answer 33

False

Question 34

Each of the following are organic functional groups except:

Answer 34

Sulfides

Question 35

Aldehydes and ketones are more susceptible to nucleophilic attack compared with carboxylic acids and esters due to:

Answer 35

Resonance stability of carboxylic acids and esters