A double covalent bond is created when O
two atoms share 1 pair of valence electrons.
O two atoms share bonds with four other atoms.
two atoms eat double mint gum
O two atoms share 2 pairs of valence electrons.

two atoms share 1 pair of valenece electrons

Explanation:

because double bond is created when each of two atoms share 2 valenece electrons (1 pair of electrons = 2 electrons)

it should be all of them because it asks if you included all of those in your answer

explanation:

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.