Chemical involve the breaking and making of chemical bonds. 1)sometimes 2)always. 3) never

Chemical changes always involve the breaking and making of chemical bonds.

Explanation:

In chemical changes, the atoms regroup to form new substances. As the first law in Thermodynamic says, "energy cannot be created or destroyed"

Option 2 Always is the Answer

Explanation:

Breaking of bonds requires energy. Absorption of energy takes place to break a bond.

Formation of a bond results in the release of energy.

Hence breaking of bonds is an endothermic process and formation of a bond is exothermic.

The enthalpy of a reaction or the Heat energy of a reaction is given by  

stands for energy of products

stands for energy of reactants

If  then ∆H will be Positive and the reaction is Endothermic

If then ∆H will be Negative and the reaction is Exothermic

h let me think

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.