AP Chemistry Mid Year Review

How many isotopes are shown in this mass spectrum?

• 1
• 84
• 86
• 4

Based on the mass spectrum, which isotope of chlorine is most abundant?

• ³⁵Cl
• ³⁷Cl
• ⁷⁰Cl
• ⁷²Cl

Tags

NGSS.HS-PS1-8

If an electron moves from n=4 to n=2 it ____

• absorbs energy

• releases energy

Tags

NGSS.HS-PS1-4

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO
• N₂O₃
• N₂O₄
• N₂O₅

How many molecules are in 2.5 mol of NaCl?

• 1.5 x 10²⁴ molecules

• 1.5 molecules

• 4.15 molecules

• 1.5 x 10²³ molecules

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

As you move across the periodic table from left to right, the atomic radius decreases.  This is because - 

• the number of protons increases, so attraction to electrons increases
• the number of energy levels increases
• the number of electrons increases
• the atomic mass increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As you move down a group, atomic radius increases because - 

• you add more and more neutrons
• you add more and more protons
• you add more and more shells (energy levels)
• you add more atomic mass

As the distance between protons and electrons increases, the force of attraction

• remains the same
• increases
• decreases
• is not affected

Tags

NGSS.HS-PS2-4

What are the two variables that affect Coulombic Attraction?

• Distance  and number of protons
• Number of neutrons and number of protons
• Number of neutrons and number of electrons
• solids or liquids

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5