AP Chemistry

A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol of O. What is the simplest formula of this compound?

• KTe2O

• K2TeO3

• K2TeO6

• K4TeO6

Consider atoms of the following elements. Assume that the atoms are in the ground state. The atom that contains only one electron in the highest occupied energy sublevel

• S

• Ca

• Ga

• Sb

Tags

NGSS.HS-PS1-1

Which of the following ground-state electron configurations represents the atom that has the lowest first-ionization energy?

• 1s2 2s1

• 1s2 2s2 2p6 3s1

• 1s2

• 1s2 2s2 2p6

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Each set of lettered choices below refers to the numbered statements immediately following it. Select the one lettered choice that best fits each statement. A choice may be used once, more than once, or not at all in each set.

(A) Cs

(B) Ag

(C) Pb

(D) Br

(E) Se

Has the highest electronegativity

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Has the largest atomic radius

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Has the lowest first-ionization energy

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atoms of an element, X, have the electronic con­figu­ration shown above. The compound most likely formed with magnesium, Mg, is

• MgX

• Mg2X

• MgX2

• MgX3

• Mg3X2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The compound CCl4 is nonflammable and was once commonly used in fire extinguishers. On the basis of the periodic properties, which of the following compounds can most likely be used as a fire-resistant chemical?

• BCl3

• CH4

• CBr4

• PbCl2

VSEPR stands for ________ theory.

• Valence Structure of Electron Pyramids and Regression

• Varied Structures of Electrons Paired and Replaced

• Varied Shell Energy of Protons and Radiation

• Valence Shell Electron Pair Repulsion

What are the bond angles in this molecule?

• all are exactly 90^o

• all are slightly more than 90^o

• all are slightly less than 90^o

• more information is needed

• some of the bonds are 90^o, others are 120^o