Question 2 (1 point) Which of the following is NOT an example of a physical change?
A metal rod dissolves in acid.
A metal rod bends.
O A metal rod is cut into two metal rods.
O A metal rod is stretched longer.

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Which terms are used to identify pure substances