Performing the Chemical Test by Reagent Strip The urine must be collected using appropriate technique and be tested within one hour ofcollection. If tests cannot be performed within this time, the specimen may be refrigerated for upto 8 hours.
Elastic and Inelastic Collisions. A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic.
First let us see what are the assumptions of the ideal gas law: 1. The molecules in the gas can be considered small hard spheres. 2. All collisions between gas molecules are elastic and all motion is frictionless (no energy is lost in collisions or in motion). 3. Newtonâs laws apply. 4. The distance between molecules on average is much larger than the size of the molecules. 5. The gas molecules are constantly moving in random directions with a distribution of speeds. 6.