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All EM waves travel at the same speed in a vacuum.

Plastic deformation happens to a material when that material is stretched beyond its elastic limit and hence won't return to its original shape. Therefore the material is permenantly mis-shaped.

The expected value of a discrete variable is defined as:

E(X) = ∑x*P(X=x) (for all possible values of x, in this case x = {1,2,3,4,5} ) 

(next, we will expand the summation and substitute in...

1 mole of gas is produces for 1 mole of metal used.

n (moles) = volume/24000             ----   This is because 1 mole of a gas occupies 24000cm3 of space, so it's...

Both of these are alkali-earth elements, this means that both elements have the same amount of outer-shell electrons (2 electrons). Strontium is a row below calcium, meaning it has an additional electron ...