Unit 5 Test Review

Unit 5 Test Review

Unit 5 Test Tuesday December 8

Multiple Choice

Which compound has hydrogen bonding?

• H₂S

• CH₄

• NH₃

• HI

Multiple Choice

Which statement explains why Br₂ is a liquid at STP and I₂ is a solid at STP?

• Molecules of Br₂ are polar, and molecules of I₂ are nonpolar

• Molecules of Br₂ are nonpolar, and molecules of I₂ are polar

• Molecules of Br₂ have stronger intermolecular forces than molecules of I₂.

• Molecules of I₂ have stronger intermolecular forces than molecules of Br₂.

Multiple Choice

London forces are stronger in heavier atoms or molecules, and weaker in lighter atoms or molecules.  Which of these has the strongest London forces?

• F₂
• Br₂
• I₂
• Cl₂

Multiple Choice

What explains the very high melting and boiling point of water

• Strong dipole-dipole bonds between water molecules
• Strong hydrogen bonds between water molecules
• Dispersion forces which are present in all molecules
• Asymmetrical shape of the polar bonds.

Multiple Choice

Which substance has the weakest intermolecular forces?

• Substance A, boiling point of 75 °C

• Substance B, boiling point of 105 °C

• Substance C, boiling point of 25 °C

• Substance d, boiling point of 45 °C

Multiple Choice

What is the name of this compound:

MgO

• Magnesium (II) oxide

• Magnesium oxide

• Magnesium monoxide

• Magnesium (I) oxide

Multiple Choice

What is the formula for the following compound:

iron (III) oxide

• FeO₃

• Fe₃O₂

• FeO

• Fe₂O₃

Multiple Choice

What is the formula for this compound:

zinc (II) sulfide

• Zn₂S

• ZnS

• Zn₂S₂

• ZnS₂

Multiple Choice

What is the formula for this compound:

tetrasulfur dinitride

• NS

• S₂N₄

• SN

• S₄N₂

Multiple Choice

What is the name of this compound:

N₂O₃

• Dinitrogen trioxide

• Nitrogen oxide

• Nitroxide

• Nitrogen (III) oxide (II)

Multiple Choice

Which is the correct Lewis structure for carbon dioxide?

Multiple Choice

What is the correct Lewis structure for NH₃?

Multiple Choice

The electronegativity difference in the bonds of CCl4 (carbon tetrachloride) is:

• 0.4
• 0.5
• 9.5
• 5.5

Multiple Choice

In a polar covalent bond, electrons are shared ___________.

• equally
• unequally
• between non-metals with similar electronegativities
• between a metal and a non-metal

Multiple Choice

The polarity of a bond is determined by...

• The sum of the electronegativities of the two atoms

• The difference in the electronegativities of the two atoms

• The charges of the atoms

• None of the Above

Multiple Select

The two (2) factors that determine if a molecule is Polar or Non-polar:

• The atoms's ionization energy

• the type of atoms in the molecule

• The atom's oxidation number

• the symmetry of the molecule

Multiple Choice

Are the bonds in this molecule polar or nonpolar?

• Non-polar

• Polar

Multiple Choice

Is this molecule polar or non-polar?

• Non-polar

• Polar

Multiple Choice

CO₂ has polar bonds but is a NON POLAR molecule. Why?

• it has an asymmetrical shape

• bond polarity or dipole moment between C and O atoms cancel

• there is net dipole moment between C and O atoms in molecule

• bond polarity does not exist between C⁺ and O^- atoms

Multiple Choice

A diatomic molecule like O₂ is always _____ because electrons are shared _____

• nonpolar; unequally

• polar; equally

• nonpolar; equally

• polar; unequally

Multiple Select

Which of the following is true about Covalent (non-polar) bonds? (select ALL true options)

• High melting point

• Low melting point

• Can dissolve in water

• Cannot dissolve in water

• Can conduct electricity

Multiple Choice

What two types of atoms make a covalent bond?

• 2 Nonmetals

• 1 Nonmetal and 1 Metal

• 2 Metals

• 2 Noble Gases

Multiple Choice

Which of the following describes covalent bonds?

• Bonds form because of opposite charges

• electrons are shared to fill outer electron shells

• Electrons are transferred between atoms

• Covalent bonds are magical

Multiple Choice

Have a low m.p. (< 200°C)

• ionic compounds
• covalent compounds

Multiple Choice

Some are solids, some are liquids, and some are gases at room temperature.

• ionic compounds
• covalent compounds

Multiple Choice

The following properties are all characteristics of ionic compounds EXCEPT

• high melting and boiling points

• soft

• crystal lattice structure

• conduct electricity when dissolved in water

Multiple Choice

Is the following compound ionic or covalent?

A material with a high melting point

• Ionic

• Covalent

Multiple Select

Which of the following is true about Ionic Bonds? (select ALL TRUE options)

• High melting point

• Low melting point

• Can dissolve in water

• Cannot dissolve in water

• Can conduct electricity

Multiple Choice

What is ionic bonding?

• Bonding that is the result of two elements sharing electrons

• Bonding involving only one atom

• Bonding that is the result of an exchange of electrons between a metal and a nonmetal

• Bonding between two metals

Multiple Choice

Why do metals conduct

• They are shiny
• The electrons are held tightly within the lattice
• The electrons are delocalised and able to move
• The electrons are shared between two metal ions

Multiple Choice

What does malleable mean?

• able to be shaped
• will break easily
• can be used for wire
• is shiny

Multiple Choice

What is the basis of a metallic bond?

• the attraction of neutral metal atoms.
• the attraction between protons and neutrons.
• the attraction between positive metal ions and interlocking electrons.
• the attraction between positive metal ions and free floating electrons.

Multiple Choice

Why is diamond strong?

• It's made of carbon
• It doesn't conduct electricity
• It forms 4 strong covalent bonds
• So it can cut glass

Multiple Choice

Why is graphite so soft?

• A.  The atoms are arranged in hexagons in layers that are held together strongly
• B.  The atoms are arranged in hexagons in layers that are held together weakly
• C.  Carbon is strongly bonded to 3 other carbon atoms.
• D.  Carbon is weakly bonded to 3 other carbon atoms.

Multiple Choice

Which of the following is an alloy?

• stainless steel

• chromium

• nickel

• lead

Multiple Choice

Alloy is a ...

• A chemical compound with combination between metal and non-metal

• A salt contain of two or more elements where the main element is non-metal

• Mixture of two or more elements where the main element is metal

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