Which property is a physical property of matter? (I think A but I'm not sure pls help)

A. boiling point

B. reactivity

C. acidity

D. flammability

What substance has a mass of 9.5g and volume of 2.1cm^3

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest