Which element combination had a covalent bond that was similar to an ionic bond? Explain. o Sodium and Chlorine

o Sodium and Hydrogen

o Sodium and Oxygen

o Chlorine and Oxygen

o Chlorine and Hydrogen

o Hydrogen and Oxygen

What is the mass of 4 molecules of co2

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

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.