Consider the reaction below. Which species is(are) the Brønsted-Lowry acid(s)? HF (aq) + NH3 (aq) = NH4+ (aq) + F- (aq)
A) HF, NH
B) NHÀ, NH}
C) F, NH
D) HF, NH3

Which of the following happens during cell division? (a) energy is created (b) waste is eliminated (c) carbon dioxide is released (d) damaged cells are replaced

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀ pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4. 0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %