Which best describes the purpose of a controlled expirement

How many atoms are in 4.00 moles of helium?

Nonmetals gain electrons under certain conditions to attain a noble gas electron configuration. 1. How many electrons must be gained by the element carbon (C) to attain noble gas electron configuration?

Calculate the percentage by mass of lead in pbco3. a. 17.96 b. 22.46 c. 73.05 d. 77.54 e. 89.22

The graph of the equation below is a circle what is the length of the radius of the circle (X-4) 2 + (y+12) 2=172

Which characteristic is least likely to be used for predicting percent dissociation of a solid in a liquid?

You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 19 quibs of substance called skvarnick.

How do you know if an element is an ion?

Which gas is not a greenhouse gas, A methane, B Water Vapor, C, Carbon dioxide, D, Nitrogen, E, Ozone

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!