Chemical compounds can have the following types of bonds: covalent, ionic or hydrogen. Which of the following statements is true?
O lonic bonds involve giving up an electron, whereas, covalent bonds share
electrons.
O All three types of bonds are caused by low electronegativity.
Polarity has a role in ionic bonds and all covalent bonds.
O Both ionic and covalent bonds involve sharing electrons.

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.