Its hybridization would be sp because Be only has 2 covalent bonds with Cl
b,f,h are already balanced
It is for safety if you come to a sudden stop like newtons law say if an object is in motion it stays in motion until a force stops it if the bike suddenly stopped then you would fly off because you wold still be going. and the gear helps protect you.
Chemical,when you light a match stick, you are starting a chain reaction of the substance chemical formula, making it a chemical change
Metal atoms have outer electrons which are not tied to any one atom. These electrons can move freely within the structure of a metal when an electric current is applied. There are no such free electrons in covalent or ionic solids, so electrons can't flow through them - they are non-conductors.
In a shorter term - no