Which of the following is a physical change? CsF(s) + XeFo(s) → CsXeF;(s)
CO2 (s) → CO2 (g)
O N2 (g) + 3H2(g) → 2NH3 (g)
2H2(g) + O2(g) → 2H20 (1)
Zn(s) + 2MnO2(s) + H2O(l) → Zn(OH)2(s) + Mn2O3(s)

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false