Draw the Lewis structure of IF−2 I F 2 − MY ANSWER IS WRONG

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

What is the density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?