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​

What is the mass of sodium in 3 moles of sodium chloride

Compare and contrast physical changes with chemical changes.

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.