What do these two changes have in common? using polish to remove tarnish from a silver spoon
salt and vinegar removing tarnish from a penny
Select all that apply.
Both are only physical changes.
Both are chemical changes.
Both are caused by heating.
Both are caused by cooling.

Both are chemical changes.

Explanation:

Tarnish can be defined as the product of the chemical reaction that occurs between a metal and a no-metal. The metal which is exposed to the moisture or get oxidized develop a thin layer called tarnish.  Copper, silver, brass, magnesium and other metals get tarnished.

The polish removes the chemical product of tarnishing and keeps the silver in silver spoon intact. This involves the chemical reaction.

Salt and vinegar are the ingredients of the chemical formulation which can remove the chemical product of the tarnishing from penny. This involves the chemical reaction.

Both polish and silver and vinegar can bring a chemical changes in the metal without introducing the physical change as they do not affect the physical structure of the metal.

d

explanation:

civil rights vs. civil liberties. civil liberties are basic freedoms while civil rights are the basic right to be free from discrimination based on such characteristics as race, disability, color, gender, national origin, and others. discriminating against an employee on the basis of gender is a civil rights violation.

i don't know the answer to this