The Lewis structure of N 2 H 2 shows __________.

each nitrogen has one lone pair

a nitrogen-nitrogen triple bond

a nitrogen-nitrogen single bond

each nitrogen has two lone pairs

each hydrogen has one lone pair

Resonance structures differ by __________.

number and placement of electrons

A lone pair is defined as

A pair of non-bonding electrons

A pair of electrons on the central atom

How are compounds with metallic bonds similar to ionic compounds?

Both tend to have high melting points

Both tend to have double and triple bonds

Both tend to have low boiling points

Both tend to have poor conductivity

The melting point of MgO is higher than that of NaF. Which of the following best explains this observation?

Mg 2+ is more positively charged than Na + and O 2- is more negatively charged than F -

O 2- is more negatively charged than F-

Mg 2+ is more positively charged than Na+

The O 2- ion is smaller than the F - ion

The elements C and Se have the same electronegativity value, 2.55. Which of the following claims about the compound that forms from C and Se is most likely to be true?

The carbon-to-selenium bond is nonpolar covalent.

The carbon-to-selenium bond is unstable.

The compound has the empirical formula CSe.

A molecule of the compound will have a partial negative charge on the carbon atom.

Which of the following correctly indicates whether the solid represented by the particulate model shown above conducts electricity and explains why or why not?

It does not conduct electricity because its ions cannot move freely within the solid.

It conducts electricity because it is made of positive and negative ions.

It conducts electricity because it is made of particles of different sizes.

It does not conduct electricity because there are small spaces between the particles.

Determine the electron geometry (eg) and molecular geometry (mg) of XeF4 (Lewis structure is shown) .

eg = octahedral, mg = square planar

eg = tetrahedral, mg = tetrahedral

eg = trigonal bipyramidal, mg = tetrahedral

Which of the following best explains why copper conducts electricity?

It has delocalized electrons that can flow in a circuit

It can have two or three valence electrons

Why is the bond angle in NH 3 molecule is smaller than that in CH 4 molecule?

Among the four electron pairs around the central atom N in NH 3 molecule, there is one lone pair which requires more space than a bonding pair and tends to compress the angles between the bonding pairs.

Among the four electron pairs around the central atom N in NH 3 molecule, there are two lone pairs which require more space than bonding pairs and tend to compress the angles between the bonding pairs.

Among the four electron pairs around the central atom N in NH 3 molecule, there is one lone pair which requires less space than bonding pairs and tend to increase the angles between the bonding pairs.

In reality, bond angle in NH 3 molecule is larger than that in CH 4 molecule.

Choose the correct Electron Geometry and then Molecular Geometry of this molecule.

Tetrahedral, Trigonal pyramidal

The acronym VSEPR stand for

valence shell electron pair repulsion.

very strong electron pair repulsion.

varied symmetry electrostatic proton reaction.

venomous snakes enjoy pink ribbons.

AP Chemistry Unit 2 Review

Authored by Michelle Salomon

Science, Chemistry

9th - 12th Grade

NGSS covered

Used 24+ times

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44 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of alloy is made when the radii of the atoms are similar in size?

interstitial

substitutional

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which atom has the negative dipole in this molecule?

Hydrogen

Fluorine

Neither

In this molecule, Carbon has a formal charge of and Nitrogen has a formal charge of _.

0, 0

1, 0

0, -1

-1, 0

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What type of alloy is this?

Interstitial

Substitutional

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the bond angle in BF₃?

120

109.5

180

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the hybridization of carbon in CH₄?

sp³

sp²

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are asymmetrical molecules polar?

Their dipoles do not cancel

Their dipoles cancel

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AP Chemistry Unit 2 Review

What type of alloy is made when the radii of the atoms are similar in size?

Which atom has the negative dipole in this molecule?