1. What is the currently most accepted model for the Universe? 2. What is the evidence for the Big Bang?
3. What happened during the Big Bang?
4. What is this "anti-gravity"?
5. Why do we think that the expansion of the Universe is accelerating?
6. What is redshift?
7. How old is the Universe?
8. What is blueshift?
9. Where was center of Big Bang?

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —

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.

What do many bases have in common? apex chemistry sem 2