The Zn/Zn2+ electrode has a standard electrode potential of EO = - 0.76 V. How does the relative potential energy of an electron at the Zn/Zn2+ electrode compare to the potential energy of an electron at the standard hydrogen electrode?
a) An electron at the Zn/Zn2+ electrode has a higher potential energy than an electron at the standard hydrogen electrode.
b) An electron at the Zn/Zn2+ electrode has a lower potential energy than an electron at the standard hydrogen electrode.
c) An electron at the Zn/Zn2+ electrode has the same potential energy as an electron at the standard hydrogen electrode.
d) Nothing can be concluded about the relative potential energy of an electron at the standard electrode potential.
CHEM 105 NOTES: CHAPTER 2, EXAM 1 MATTER -chemistry: the study of matter and the changes matter undergoes -matter: anything that has mass and occupies space Forms of matter: 1) Macroscopic: the living world 2) Microscopic: cells, crystals, things that you can see under a microscope 3) Particulate: atoms, molecules, things you cannot see with a microscope States of matter: 1) Solid: shape and volume are independent of its container a) Crystalline: regular, repeating, 3D patterns (salt, sugar) b) Amorphous: solids without shape or form (gels and plastics) 2) Liquid: has definite volume but not definite shape; particles held together by strong attractive forces 3) Gas: has indefinite volume and no fixed shape; particles move independently; have overcome the attractive force that hold them together Changes matter undergoes: 1) Physical change: matter changes from one state to another state (solid to liquid to gas) -any change of state is physical change -the matter that is being changed from one state to another remains the same at the particulate level (Ex: ice is always h2o) 2) Chemical change: the chemical identity of a substance is destroyed and a new substance is formed -indicators: color, evolution of heat, light given off, change in odor, explosion SCIENTIFIC NOTATION -method for expressing numbers n -coefficient (a.bcd) will be number 1-10 mul