Exam 2!

Ionic Bonds

100

What makes an ionic bond?

What is transfer of electrons between a cation and an anion?

200

Ferrous Nitride

What is Fe₃N₂?

300

Why is a cation positive and an anion negative?

What is an imbalance of electrons and neutrons, creating a charge?

400

Name of (NH₄)₂(CO₃)

What is ammonium carbonate?

500

Formula and name of Ba²⁺ and (NO₃)^-

What is Ba(NO₃)₂, called Barium Nitrate?

Covalent Bonds

100

How are covalent bonds formed?

What is a sharing of electrons?

200

The structure of NHO (w/o lone pairs shown)

O=N-H

300

The geometry of CH₂O

Trigonal Planar 120^o

400

Bond angle around O on the board!

Bent (109.5)

500

O-N-O and N-C-H Bond angles on board!

Trigonal Planar 120^o and Tetrahedral 109.5^o

Electronegativity

100

What are the rules of electronehgativity?

<.5 = nonpolar

.5-1.9 = polar

1.9< = ionic

200

What are the exceptions? What makes a molecule nonpolar if the binds are polar?

Trigonal Planar, tetrahedral, or linear shape with all of the same type of attached elements to center element!

300

Arrange elements in order of increasing electronegativity:

F, Na, Al, C, Cs

Cs, Na, Al, C, F

400

Does BeCl₂ have polar bonds?

Yes!

500

Is BeCl₂ a polar molecule?

No!

Balancing Equations

100

_C3H8O+_O2 ->_CO2+_H2O

What is the coefficient in front of Oxygen?

9

200

3 AgNO₃+_(NH₄)₃(PO₄) -> Ag₃(PO₄)+ 3 (NH₄)NO₃

Is this equation balanced?

Yes!

300

_Cl₂+_NaI -> _NaCl+_I₂

What is the sum of the balanced coefficients?

6

400

A.  _C₇H₁₆+_O₂ -> 7 CO₂+8 H₂O

B. _K₂CrO₄+_Pb(NO₃)₂ -> 2 K(NO₃)+_PbCrO₄ 

C.  4 Fe₃O4+_O₂ -> 6 Fe₂O₃

Which equation isn't balanced?

A

Moles

100

How many molecules in 7.5 moles SO₂?

4.52 x 10²⁴ molecules SO₂

200

Grams in .248 moles KBrO₂?

37.4 g KBrO₂

300

Milligrams in .354 moles NH₄Cl?

1.89 x 10⁴ mg NH₄Cl

400

Atoms in 66.3 g of gold?

2.03 x 10²³ atoms of Gold