In chemistry, the ph of an aqueous solution is a measure of its acidity. the ph scale ranges from 0 to 14, inclusive. a solution with a ph of 7 is said to be neutral, a solution with a ph greater than 7 is basic, and a solution with a ph less than 7 is acidic. write a script that will prompt the user for the ph of a solution, and will print whether it is neutral, basic, or acidic. if the user enters an invalid ph, an error message will be printed.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?