1. a sample consisting of 1.0 mol caco3 (s) was heated to 800oc when it is decomposed. the heating was carried out in a container fitted with a piston that was initially resting on the solid. calculate the work done during complete decomposition at 1.0 atm. what work would be done if instead of having a piston, the container was open to the atmosphere?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this