Question

how can a scientist determine the strength of the intermolecular forces in a substance? select all that apply.
by measuring the electrical conductivity of the atoms in a solid state
by identifying the shape of the molecule based on the number of covalent bonds that it forms
by determining and comparing the electronegativity of the atoms in the compound
by heating the substance and identifying the temperature at which it undergoes a phase change

Explanation:

• Electrical conductivity in solid state measures presence of free - moving charged particles (like in ionic or metallic solids), not directly intermolecular forces.
• Molecular shape from covalent bonds relates to molecular geometry (VSEPR theory) but not intermolecular force strength.
• Electronegativity comparison helps in determining bond polarity (ionic vs covalent character in bonds), which is related to types of intermolecular forces (e.g., dipole - dipole if polar).
• Phase change temperatures (melting, boiling) are affected by intermolecular force strength. Stronger forces require more energy (higher temperature) to overcome and change phase.

Answer:

by determining and comparing the electronegativity of the atoms in the compound, by heating the substance and identifying the temperature at which it undergoes a phase change