#1
What type of bond involves the sharing of electron pairs between atoms?
Covalent bond
ExplanationShared electron pairs between atoms.
#2
What is the chemical formula for sodium chloride?
NaCl
ExplanationSodium and chlorine combine in a 1:1 ratio.
#3
Which type of bond results from the electrostatic attraction between positively and negatively charged ions?
Ionic bond
ExplanationAttraction between oppositely charged ions.
#4
What is the chemical formula for water?
H2O
ExplanationTwo hydrogen atoms and one oxygen atom.
#5
What is the name of the compound with the chemical formula H2SO4?
Sulfuric acid
ExplanationComposed of sulfur, hydrogen, and oxygen.
#6
Which of the following is an example of a polar molecule?
H2O
ExplanationAsymmetrical distribution of charge due to electronegativity difference.
#7
What is the molecular geometry of a molecule with 3 bonded pairs and 1 lone pair of electrons?
Trigonal pyramidal
ExplanationThree bonded atoms and one lone pair result in a pyramidal shape.
#8
Which of the following molecules has a trigonal bipyramidal molecular geometry?
SF6
ExplanationFive electron pairs result in a bipyramidal shape.
#9
What is the hybridization of the central atom in ammonia (NH3)?
sp3
ExplanationOne s and three p orbitals combine.
#10
What is the molecular geometry of a molecule with 2 bonded pairs and 2 lone pairs of electrons?
Bent
ExplanationLone pairs repel bonded pairs, resulting in a bent shape.
#11
Which of the following molecules has a nonpolar covalent bond?
CO2
ExplanationSymmetrical distribution of charge due to equal electronegativity.
#12
Which of the following compounds has both ionic and covalent bonds?
HCl
ExplanationCovalent bond between hydrogen and chlorine, forming an ionic compound.
#13
What is the name of the compound with the chemical formula CaCO3?
Calcium carbonate
ExplanationCombination of calcium, carbon, and oxygen atoms.
#14
Which of the following compounds is an example of a network covalent solid?
Diamond
ExplanationEach carbon atom forms four covalent bonds.
#15
What is the name of the compound with the chemical formula K2SO4?
Potassium sulfate
ExplanationCombination of potassium ions and sulfate ions.