Explain how the heat measured in example 5.5 diffees from enthalpy change for the exothermic reactions described by the following equation:
hcl + naoh ? nacl + h2o
reference example 5.5
heat produced by an exothermic reaction
when 50.0ml of 0.10 m hcl and 50.0 ml of 0.10 m naoh, both at 22.0c are added to a cofee cup calorimeter, the temperature of the mixture reaches a maximum of 28.9 c. what is the approximate amount of heat produced by this reaction
hcl + naoh ? nacl + h2o

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: