Automotive batteries can
a. produce explosive gasses
b. cause chemical burns to the skin and eyes
c. heat metal jewelry to its melting point
d. all of the above

All of the Above would be your answer. The battery contains acid and gasses that can explode and cause burns to the skin if precautions aren't taken. The chemicals are so strong that the battery acid an also melt jewelry and other soft metallics.

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.