A pure substance that cannot be broken into simpler substances by physical or chemical means

The chemical formula for copper iodide is Cul. How many atoms of copper (Cu) is it made from? How many atoms of iodine (I) ?

Which term best indicates the total number of neutrons and protons in a particular isotope of an element? atomic number mass number group number atomic mass

How many oxygen atoms in 2.28 mol HNO3?

Which of the following is NOT an example of a physical property? A. Solid ice can be very brittle. B. Water can form hydrogen and oxygen gas under electrolysis conditions. C. Water can freeze solid at 32 degrees Fahrenheit. D.

How many atoms of hydrogen are there in 3.0kg of ethane

How many grams of oxygen are formed when 8.20 moles of KOH are formed? 4 KO (s) + 2 H2O (l) → 4 KOH (s) + O2 (g)

It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!

When aluminum, Al, metal is dipped in an aqueous solution of hydrochloric acid, HCl, hydrogen gas, H2, is produced with the formation of an aluminum chloride, AlCl3, solution.

What are the advantages of using solar energy

Which of the following has the highest critical temperature? H2 N2 NH3 H2O