Someone answer this. It's not chemical into electric

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .