Students place an ice cube on the outside window sill of their classroom. They do this four times throughout the year. The table below shows what they observed. Outside Temperature (°C) Time it Takes for Ice Sample to Melt (min) 30 22 25 35 20 67 15 122 Which of these best explains the data in the table? A. Ice only melts at temperatures above 25°C. B. Ice melts at the same rate at any temperature. C. Ice melts faster at higher temperatures. D. Ice melts slower at higher temperatures.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.