Which of the following is true about chemical bonds?
a.
chemical bonds can form when valence electrons are transferred or shared between atoms.
b.
chemical bonds do not involve transferring or sharing of valence electrons between atoms.
c.
chemical bonds can form only when valence electrons are transferred between atoms.
d.
chemical bonds can form only when valence electrons are shared between atoms.

A

Explanation: Chemical bonds can form when there is a transfer or sharing of electrons since there are different kinds of chemical bonding and not all involve the sharing or transfer of electrons, as in interstitial bonding, and some coordination compounds.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.