50.0g of lead are placed in a calorimeter with 100.0mL of water. As a result the water's ΔT is 5.0℃ which calculates to 2100J of heat absorbed by water, what is the ΔH (change in heat) of the lead

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

Which element is the least metallic between cadmium, silver, zinc, or iron?