A compound is found to contain 4.315% boron and 95.68% bromine by mass. What is the empirical formula for this compound?

List four observations that indicate that a chemical reaction may be taking place

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

Name the element in group 17, period 2. (periodic table)