a single atom of an element had 21 neutrons, and 20 electrons, and 20 protons which element is it? K. Zr. Ca. Sc

A sample of air is slowly passed through aqueous Sodium hydroxide and then over heater copper. Which gases are removed by this process?

Write the word equation for HNO3+NaHCO3->NaNO+H2O+CO2

Arrange these molecules in order of decreasing mass: C 6 H 14 , NO 2 , Fe 2 O 3 , and CaCO

Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas. what volume of chlorine would be produced by this reaction if of hydrogen chloride were consumed?

What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% c and 14.4 % h

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

Are there any good tips for organic chemistry reactions?