This reaction was monitored as a function of time: a — b+c a plot of in[a] versus time yields a straight line with slope -0.0045/s. a. what is the value of the rate constant (k) for this reaction at this temperature? b. write the rate law for the reaction. c. what is the half-life? d. if the initial concentration of a is 0.250 m, what is the concentration after 225 s?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

In a good thermo flask the main cause of heat loss is