In any chemical compound the elements are always combined in the same proportion by__.

a) charge

b) mass

c) volume

d) density

How many moles of MgCl2 are there in 329g of the compound

The mole and Avogadro's number are now almost synonymous with each other. We say that one mole of a substance is the amount that contains Avogadro's number of particles. However, both concepts were developed independently at different times.

Which descriptions apply to emitted radiation? Check all that apply. measurement in Ci/Bq measurement in conventional rad or the SI Gy the amount of radioactive materials released into the environment.

18. How are ionic compounds formed? A) Atoms share electrons. B) Elements change into different elements. C) Atoms gain/lose electrons and are held together by electrostatic forces. D) Atoms share protons.

What is most likely the ph of a solution containing many hydroxide ions (oh-) and few hydrogen ions (h) ?

Which of the following elements has its highest energy electrons in an "s" atomic orbital? radiium (Ra) neon (Ne) aluminum (Al) lanthanum (La)

About how long does it take for the Sun to make one rotation on its axis?

Does a physical change affect the identity of a substance

If the cost of electricity is 8 cents/kWh, how much will it cost to use the light for a whole year (365 days) ?

Place the object into the graduate cylinder and record the new volume of water