WorksheetsPRE-AP CHEMISTRY (STUDY GUIDE) FINAL EXAM (40 Items)
Total questions: 40
Worksheet time: 20mins
When you sweat, water on your skin absorbs heat and evaporates. Which intermolecular force is MOST responsible for the large amount of heat needed to evaporate water?
London dispersion forces
Dipole-dipole interactions
Hydrogen bonding
Ion-dipole forces
A company wants to design a perfume that evaporates easily and spreads through the air quickly. Which property should the fragrance molecules have?
Strong hydrogen bonding
Weak intermolecular forces
High boiling point
High polarity
Cooking oil does not dissolve in water even when mixed vigorously. Which statement best explains why?
Water has no intermolecular forces
Oil is less dense than water
Water molecules can hydrogen-bond; Oil molecules cannot
Oil contains ions that repel water
A molecule has 3 BP and 0 NBP on the central atom. What is its molecular geometry?
Bent
Linear
Trigonal planar
Tetrahedral
NH3 has 3 BP and 1 NBP. Which shape and property explain why ammonia has a strong smell?
Linear and nonpolar
Trigonal planar and nonpolar
Trigonal pyramidal and polar
Bent and polar
A student models a molecule with 2 BP and 2 NBP. Which everyday substance most likely fits this geometry?
Carbon dioxide (CO2)
Water (H2O)
Methane (CH4)
Boron trifluoride (BF3)
CO2 has 2 BP and 0 NBP on the central atom. Which shape explains why CO2 is nonpolar?
Tetrahedral
Linear
Trigonal pyramidal
Bent
Which statement correctly describes an ionic bond?
Electrons are shared equally
Electrons are transferred from metal to nonmetal
Two metals share electrons
Two nonmetals share electrons
Table salt melts ice because NaCl dissolves in water. Why does this happen?
Water forms covalent bonds with salt
Ion-dipole interactions occur between H2O and Na+/Cl-
Salt molecules spread out easily
Water has no polarity
Which compound is most likely covalent?
CaO
NaCl
CO2
MgF2
A battery electrolyte solution conducts electricity. Why?
Covalent molecules share electrons
Ionic substances produce ions in solution
Nonpolar molecules move easily
Gases with weak IMFs
Why do ionic compounds generally have high melting points?
They contain weak forces
Atoms are neutral
Strong attraction exists between oppositely charged ions
Electrons move freely
Sugar dissolves in water but does NOT conduct electricity. What does this show?
It is ionic
It is covalent and forms molecules
It releases ions in solution
It contains metals
Substance A melts at 40°C; Substance B melts at 800°C. What is likely true?
A. A is ionic, B is covalent
B. A has strong bonds, B has weak bonds
C. A is covalent, B is ionic
D. Both are ionic
A student analyzes a metal pot heating on a stove. Which bonding property explains why metals conduct heat well?
Delocalized electrons in metallic bonding
Ions strongly attracting
Weak dispersion forces
Polar molecules
What is the correct formula for calcium chloride?
CaCl
CaCl₂
Ca₂Cl
Ca₂Cl₃
Name the compound Na₂O.
Sodium oxide
Disodium oxide
Sodium monoxide
Sodium dioxde
Aluminum ions (Al³⁺) and oxygen ions (O²⁻) combine. What formula forms?
AlO
Al₂O₃
Al₂O₂
AlO₂
What is the name of CO?
Carbon oxide
Carbon dioxide
Carbon monoxide
Monocarbon oxide
What is the formula for magnesium nitride?
MgN
Mg₂N
Mg₃N₂
MgN₃
A cleaner contains FeCl₃. What is its correct name?
Iron chloride
Iron chlorine
Iron trichloride
Triiron chloride
Which name is correct for N₂O₄?
Dinitrogen tetroxide
Nitrogen oxide
Nitrogen tetroxide
Dinitrogen dioxide
What is the correct formula for potassium sulfide?
KS
K₂S
KS₂
K₂S₂
What is the correct name for PCl₅?
Phosphorus pentachloride
Phosphorus chloride
Pentaphosphorus chloride
Monophosphorus pentachloride
Which compound name and formula are correctly paired?
Magnesium fluoride — MgF
Sulfur trioxide — SO₂
Dinitrogen monoxide — N₂O
Calcium oxide — CaO₂
Rubbing alcohol evaporates faster than water. What does this indicate?
Alcohol has stronger IMFs
Water has weaker IMFs
Alcohol has weaker IMFs
Both have same IMFs
Which observation supports that water is polar?
Water dissolves oil
Water dissolves sugar but not salt
Water dissolves salt and sugar but not oil
Water dissolves all three substances
A molecule has 4 BP and 0 NBP. Which compound fits?
Methane (CH₄)
Water (H₂O)
Ammonia (NH₃)
Carbon dioxide (CO₂)
A molecule with 3 BP and 2 NBP has which geometry?
Linear
T-shaped
Bent
Trigonal pyramidal
SO₂ has 2 BP and 1 NBP. What is its geometry?
Linear
Bent
Trigonal planar
Tetrahedral
Which scenario shows ionic bonding?
Two chlorine atoms share electrons
A sodium atom gives an electron to chlorine
Two oxygen atoms share electrons
Two nitrogen atoms overlap orbitals
Why do electrolytes conduct electricity?
They form covalent molecules in water
They create ions that move freely
They have strong molecular forces
They are metals dissolved in water
Distilled water does not conduct electricity because:
Water is ionic
Water contains no ions naturally
Water contains metals
Water contains equal electrons/protons
Why does solid CO₂ sublimate (transform to gas) easily?
It has strong ionic bonds
It has weak IMFs
It is metallic
It is highly polar
Copper wire bends without breaking because of:
Ionic bonding
Covalent bonding
Metallic bonding
Hydrogen bonding
What is the correct name for KBr?
Potassium bromide
Potassium bromate
Potassium bromite
Potassium monobromide
What is the formula for aluminum sulfide?
AlS
Al₂S₃
Al₂S₂
Al₃S
Name NO₂.
Nitrogen oxide
Dinitrogen oxide
Nitrogen dioxide
Dinitrogen dioxide
What is the formula for calcium phosphate?
CaPO₄
Ca₂PO₄
Ca₃(PO₄)₂
Ca(PO₄)₃
Which pair is correctly matched?
SF₆ — sulfur hexafluoride
NCl₃ — nitrogen trichloroxide
CO₂ — carbon monoxide
P₂O₅ — diphosphorous monoxide
