Topic Science assess

Question 1

Electrons prefer to occupy degerate orbitals and have parallel spins

Answer 1

Hund’s rule

Question 2

Mass # of a neutra element =

Answer 2

of protons + neutrons

Question 3

Trend of electronegativity in the periodic table

Answer 3

Increases up and right

Question 4

Electron affinity =

Answer 4

The amount of energy released when a gaseous atom or ion gains an electron

Question 5

Which decreases from left to right across a period?

Electronegativity, atomic radius, electron affinity, or ionization energy?

Answer 5

Atomic radius

Question 6

Order the following in increasing intermolecular bond strength:

Hydrogen bonding, dispersion forces, dipole-dipole interaction

Answer 6

Dispersion forces < Dipole-dipole interaction < Hydrogen bonding

Question 7

Molecular geometry of boron trifluoride (BF₃)?

Answer 7

Trigonal planar

Question 8

Type of reaction for:

CaCl₂(aq) + 2 AgNO₃ (aq) -> Ca(NO₃)₂ (aq) + 2 AgCl(s)

Answer 8

Metathesis

Question 9

Things that affect reaction rates

Answer 9

Increase temp, lower Ea, incrase reactant collision frequency

Question 10

The only physical factor that can change the value of the Keq is…

Answer 10

Temperature

Question 11

What’s the Equation for Gibbs free energy?

Answer 11

∆G˚ = ∆H˚– T∆S˚

Question 12

Kinetic molecular theory of gases equation(s)

Answer 12

KE = (3/2)kT

KE = (1/2)mv²

Question 13

Boyle’s Law

Answer 13

P₁V₁ = P₂V₂

Question 14

What is the concentration of Ag+ in a saturated solution fo AgCl @ 25˚C (Ksp of AgCl = 1.8 x10^-10)

Answer 14

1.34x10^{-5 M}

Question 15

A scientists wants to prepare a 50 mM solution of NaOH. if he starts out with 60 mL of 0.3 M NaOH and adds pure water until reachign teh desired concentration, how much water will he have added?

Answer 15

300 mL

Question 16

What’s the relationship between pH and hydrogen ion concentration?

Answer 16

pH = -log[H+]

i.e. if [H+] = 10^-6 then pH is 6

Question 17

As NAD+ is converted into NADH during fermentation, it is acting as a …

Answer 17

oxidizing agent

Question 18

For sodium carbonate, what are it’s oxidation #s?

Answer 18

Sodium carbonate = Na₂CO₃

Na = +1

C = +4

O = -2

Question 19

In a galvanic cell, ____ occurs at the anode, ____ occurs at the cathode, and the reaction is (spontaneous/nonspontaneous)

Answer 19

Oxidation occurs at the anode.

Reduciton occurs at teh cathode.

Reaction is spontaneous

Question 20

Galvanic cell is defined as a (+/-) EMF which means that the reaction is (spontaneous/nonspontaneous)

Answer 20

Galvanic cell = +EMF

Rxn is spontaneous

Question 21

Relationship between acid dissocaiton constants and sterngth? (in terms of Ka and pKa)

Answer 21

A strong acid will ahve the highest Ka and lowest pKa

Question 22

Charles’ Law

Answer 22

V₁/T₁ = V₂/T₂