There are 92 naturally occurring elements. how does this relate to the number of compounds?

a) because it takes at least two elements to make a compound, there are fewer than 46 kinds.

b) there are exactly 92 kinds of compounds, one for every kind of element.

c) elements combine in different ways to create many more than 92 compounds.

d) the number of compounds constantly increases as we discover new elements.

The two required components for a generator

If the area of a square has increased by a factor of 16, by how much has each side increased?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.