Assuming the neutralization reaction is the system Oь
positive heat, +9 and enthalpy, AH
negative heat, -q and enthalpy, -AH
d
heat flows into the system
heat flows into the surroundings
8
exothermic
endothermic
h
the surroundings are losing energy
the system is losing energy
1
Om the system is gaining energy
On the surroundings are gaining energy

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.