Question

1. choose the best answer.

molecular formulas show the actual ___ of atoms in a molecule.
ratio
system
number

1. choose the best answer.

the energy needed to break the bonds of one mole of molecules is called ___.
lattice energy
bond energy
ionic energy
potential energy

Explanation:

Question 3

Molecular formulas (e.g., \( \text{C}_6\text{H}_{12}\text{O}_6 \) for glucose) represent the actual count of each type of atom in a molecule. "Ratio" is for empirical formulas (simplest atom ratio), "system" is irrelevant. So "number" fits.

Bond energy is defined as the energy required to break one mole of a particular bond in a molecule. Lattice energy relates to ionic compounds’ lattice, ionic energy is not a standard term, and potential energy is broader. So "bond energy" is correct.

Answer:

C. number

Question 4