Dãy các chất tác dụng được với dung dịch HCl loãng tạo thành sản phẩm có chất khí A. BảO, FE, CaCO3 B. Al, MgO, KOH

C. Na2SO3,CaCO3,Zn D. Zn, Fe2O3,Na2So3

Which element is least likely to undergo a chemical reaction

The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water