Which of the following is an example of a business using a database to retrieve and display information?
a.
the flight attendant directs you to view the safety information on the overhead tv screen.
b.
the checker at the grocery store scans your item and the price appears on the screen.
c.
the monitor on the exercise bike at the gym automatically displays your heart rate.
d.
the real estate agent displays a multimedia slideshow of homes for sale.

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.