AP Chem: Unit 1

Question 1

What is Avogadro’s number?

Answer 1

6.022 x 10^23

Question 2

How do you calculate the average atomic mass?

Answer 2

mass (%)+mass (%)+ mass (%)+ mass (%), etc

Question 3

What is ionization energy?

Answer 3

The amount of energy required to remove an electron from an isolated atom or molecule. (He is the highest 1rst ionization energy. Increases to the top because electrons are closer to nucleus)

Question 4

What are some examples of pure substances?

Answer 4

individual molecules: (CO^2) individual atoms: (Zn) ions held together in a fixed proportion: NaCl

Question 5

Theoretical Yield VS Experimental Yield

Answer 5

theoretical yield - the amount of product you would get if you use up all of the limiting reagent experimental yield - the actual amount of product you obtain when performing a given experiment.

Question 6

What energy level is the first to remove or lose electrons within a PES?

Answer 6

Valence electrons

Question 7

Which energy level is the hardest to remove pertaining to the PES model?

Answer 7

Electrons closest to the nucleus. They have the highest binding energy Ex: 1s^2

Question 8

What formula is % by mass of two elements?

Answer 8

mass %= element/ total compound

Question 9

Which element is the biggest atom on the periodic table?

Answer 9

Fr (francium) has the most shells

Question 10

Which element is the smallest atom on the periodic table?

Answer 10

He (helium) has the least amount of shells due to being in Group 8!

Question 11

Which part of the periodic table is the only section of electron configuration that changes?

Answer 11

The middle part of the table, which are the transition metals.