1. Several scientists helped contribute to creating the modern model of the atom. Which statement
below is NOT a true statement about the structure of an atom?
A) The majority of an atom is empty space associated with the electron cloud.
B) The nucleus of an atom is very large and contains protons and neutrons.
c) The nucleus possesses a positive charge associated with protons.
D) The nucleus contains neutrons which carry no charge.

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.