HELP PLEASE A positive test for a base occurs when

A) red litmus remains red
B) blue litmus remains blue
C) blue fitmus turns red
D) red litmus turns blue​

How do you know when a chemical reaction has occurred

Which substance can be broken down by chemical means

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green