Professor Jones believes that college football players are not serious students, and he expects them to do poorly in his classes. Jack is a football player in Professor Jones’ class. Professor Jones tends not to call on Jack when he raises his hand. Professor Jones also tends not to give much feedback on Jack’s written work. As a result, Jack disengages from the class and puts less effort into his studies. This process can be described as

When we have spent a lot of resources, such as time and sacrifice, on a relationship, we might be reluctant to leave it even though the relationship is not optimal. This is called

In a classic study demonstrating cognitive dissonance, Festinger and Carlsmith (1959) asked participants to engage in an extremely boring task. Participants in one condition were paid $20 to lie to the next participant and tell them the study was enjoyable. Another group of participants was paid $1 to tell this lie. A control group was not asked to lie. Afterwards, which group privately reported that they enjoyed the boring task the MOST?

Experiments allow careful assertion of causality because of

The first atomic explosion was detonated in the desert north of Alamogordo, New Mexico, on July 16, 1945. What fraction of Strontium-90 (t1/2 = 28.8 years) originally produced by the explosion still remains as of July 16, 2026?

What is the percent yield when 1.72 g of H2O2 decomposes and produces 375 ml of O2 gas measured at 42 oC and 1.52 atm? 2H2O2(aq) ® 2H2O(l) + O2(g)

Medical imaging is used when a patient ingests a radioactive emitter, called tracer, so a doctor can view an internal system. Which tracer emission will penetrate through the body?

What is the energy change for a system that releases100 kJ of heat to its surroundings and has 25 kJ of work done on it?

Calcium carbide (CaC2) can be made by heating calcium oxide (lime) with carbon (charcoal). CaO(s) + 3C(s) ” CaC2(s) + CO(g); ΔHo = +464.8 kJ How much heat, in joules, is absorbed in a reaction in which 2.50 mol C(s) is consumed under these conditions?  

When 1.045 g of BaO is added to 100.0 ml of water at 22.0 oC in a coffee-cup calorimeter, the temperature of the water increases to 25.7 oC. Assume that the specific heat and density of the solution is 4.184 J/g∙oC and 1.00g/ml, respectively. The heat capacity of the calorimeter is 25.0 J/oC. Calculate ΔH for the reaction. BaO(s) + H2O(l) → Ba(OH)2(aq); ΔH = __________