How does conduction transport heat through a steel rod that is placed in a fire?
A. Energy spreads from one end of the rod to the other through
molecular collisions.
O B. Hot steel molecules move down the molecular matrix toward the
cool end of the rod.
C. Higher velocities of warmer steel molecules cause them to travel
from one end to the other.
D. Waves of electromagnetic energy travel down the steel rod from
one end to the other.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

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.