Gen Chem 1 Final Exam Questions and
Answers | Latest Update | 2024/2025 |
Graded A+
What is the principle behind the law of conservation of mass in a chemical reaction?
✔✔ The law of conservation of mass states that mass is neither created nor destroyed in a
chemical reaction; the total mass of reactants equals the total mass of products.
How do you determine the number of valence electrons in an atom?
✔✔ The number of valence electrons can be determined by the group number of the element in
the periodic table; elements in the same group have the same number of valence electrons.
What is the difference between an ionic bond and a covalent bond in terms of electron
distribution?
✔✔ An ionic bond involves the transfer of electrons from one atom to another, resulting in
positively and negatively charged ions, while a covalent bond involves the sharing of electrons
between atoms.
What information can be obtained from the molecular formula of a compound?
1
,✔✔ The molecular formula provides the exact number and types of atoms in a molecule but does
not reveal the arrangement of the atoms.
How do you calculate the average atomic mass of an element from its isotopes?
✔✔ The average atomic mass is calculated by taking the weighted average of the masses of the
element’s isotopes, based on their relative abundances.
What is the role of a solvent in a solution, and how does it differ from the solute?
✔✔ The solvent is the substance that dissolves the solute to form a solution. It is usually present
in a greater amount compared to the solute.
What are the key differences between an empirical formula and a molecular formula?
✔✔ The empirical formula represents the simplest whole-number ratio of atoms in a compound,
while the molecular formula represents the actual number of atoms of each element in a
molecule.
How does the concept of electronegativity help in predicting bond polarity?
2
, ✔✔ Electronegativity helps predict bond polarity by indicating how strongly an atom attracts
electrons in a bond; a greater difference in electronegativity between two atoms leads to a more
polar bond.
What are the general properties of gases according to the kinetic molecular theory?
✔✔ According to the kinetic molecular theory, gases consist of particles in constant random
motion, occupy the entire volume of their container, and have negligible intermolecular forces.
How do you determine the empirical formula of a compound given its percentage composition?
✔✔ To determine the empirical formula, convert the percentage composition to moles, find the
simplest whole-number ratio of the elements, and use this ratio to write the empirical formula.
Matter ✔✔Most basic building block. Must have mass and volume
Elements ✔✔Simplest form of matter, can't decompose any further
Molecules ✔✔Two or more atoms "linked" together
3
Answers | Latest Update | 2024/2025 |
Graded A+
What is the principle behind the law of conservation of mass in a chemical reaction?
✔✔ The law of conservation of mass states that mass is neither created nor destroyed in a
chemical reaction; the total mass of reactants equals the total mass of products.
How do you determine the number of valence electrons in an atom?
✔✔ The number of valence electrons can be determined by the group number of the element in
the periodic table; elements in the same group have the same number of valence electrons.
What is the difference between an ionic bond and a covalent bond in terms of electron
distribution?
✔✔ An ionic bond involves the transfer of electrons from one atom to another, resulting in
positively and negatively charged ions, while a covalent bond involves the sharing of electrons
between atoms.
What information can be obtained from the molecular formula of a compound?
1
,✔✔ The molecular formula provides the exact number and types of atoms in a molecule but does
not reveal the arrangement of the atoms.
How do you calculate the average atomic mass of an element from its isotopes?
✔✔ The average atomic mass is calculated by taking the weighted average of the masses of the
element’s isotopes, based on their relative abundances.
What is the role of a solvent in a solution, and how does it differ from the solute?
✔✔ The solvent is the substance that dissolves the solute to form a solution. It is usually present
in a greater amount compared to the solute.
What are the key differences between an empirical formula and a molecular formula?
✔✔ The empirical formula represents the simplest whole-number ratio of atoms in a compound,
while the molecular formula represents the actual number of atoms of each element in a
molecule.
How does the concept of electronegativity help in predicting bond polarity?
2
, ✔✔ Electronegativity helps predict bond polarity by indicating how strongly an atom attracts
electrons in a bond; a greater difference in electronegativity between two atoms leads to a more
polar bond.
What are the general properties of gases according to the kinetic molecular theory?
✔✔ According to the kinetic molecular theory, gases consist of particles in constant random
motion, occupy the entire volume of their container, and have negligible intermolecular forces.
How do you determine the empirical formula of a compound given its percentage composition?
✔✔ To determine the empirical formula, convert the percentage composition to moles, find the
simplest whole-number ratio of the elements, and use this ratio to write the empirical formula.
Matter ✔✔Most basic building block. Must have mass and volume
Elements ✔✔Simplest form of matter, can't decompose any further
Molecules ✔✔Two or more atoms "linked" together
3
