"Cracks" are placed between sidewalk concrete to prevent damage because, when heated, the concrete will undergo . Please need help really bad !! A. Pressure expansion
B. Volume expansion
C. Thermal expansion
D. Solid expansion

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Phosphorous can form an ion called phosphide, which has the formula p3−. this ion can form an ion called phosphide, which has the formula p3−. this ion properties very similar to those of pforms when a phosphorus atom loses three protonsis called a cationcontains 18 electrons