AP CHEM SEM1

Unit 1

100

1 mole = ??? Formula Units

6.022 x 10²³

200

1s² 2s² 2p⁵ is what neutral element?

Fluorine

300

When the atomic radii increases in the periodic table...

What happens to the attraction of the valence electrons? 

It decreases

400

Which shell or orbitals will have the most binding energy?

The one closest to the nucleus (1s)

500

Explain why the first ionization energy of K is less than that of Ca?

The valence electron of K experiences a lower effective nuclear charge than the valence electrons of Ca

Unit 2

100

What element has the most electronegativity?

Fluorine

200

True or False

In covalent bonding, one atom transfers electrons to the other atom.

False. Covalent Bonds shares electrons.

300

What is the bond angle of NH₃?

109.5 degrees

400

What are formal charges?

A charge on an atom in a molecule if all bonding electrons were shared equally.

500

What is the electronegativity difference that can determine what molecules are polar?

0.5 or higher.

Unit 3

100

What is the formula of the Ideal Gas Law?

PV=nRT

200

What is the IMF that every single molecule has?

London Dispersion Forces

300

Hydrogen bonding is when hydrogen are attraction to what elements.

Oxygen, Nitrogen, and Fluorine

400

How do we tell if a ion are good conductors of electricity?

If the cation and the anion are moving freely. 

500

What should we determine to have the strongest ion-dipole attracted to water?

The largest charge to size ratio.

Unit 4

100

What is the difference between Physical and Chemical Change?

Physical change doesn't change the chemical formulas.

200

Oxidation .... electrons.

Reduction .... electrons.

1. loses

2. gains

300

True or False

An acid forms a conjugate base by gaining a Hydrogen.

False, it loses it.

400

What is Brønsted-Lowry base?

When it accepts a Hydrogen.

500

A student measures 100.0 mL of 0.500 M NaOH solution, then dilutes the solution with 150.0 mL of water. This was titrated with HCl, and 60.0 ml was required to reach the equivalence point. What was the concentration of the HCl?

0.833 M

Unit 5

100

If we have rate=k[X]²[Y], what is the overall rate?

3

200

What has more surface area, A piece of an element or powdered sample? 

Powdered sample

300

What is the equation that relates k value and half life for a first order reaction?

t_1/2 = (0.693)/k

400

If we have rate=k[CH₃I][NaOH], what will happen to the concentration when CH₃I and NaOH is doubled?

The concentration will increase by a factor of 4

500

Step 1: A + B --> C  (Slow)

Step 2: C + B --> D  (Fast)

Step 3: D --> C + 2B  (Fast)

Which letter are the intermediates and catalyst?

Intermediates: C and D

Catalyst: B