What does this weather map symbol represent, and what is its meaning? A) Moving front: the area between two air masses where is constantly in motion B) Stationary front: the boundary between two air masses where no air moving o Cold front: the leading edge of a cold air mass is pushing against a warm air mass D) Warm front: the leading edge of a warm air mass is pushing in to replace a cold air mass

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

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.

there are two significant figures.