Which of the following equals one atomic mass unit? a. the mass of one electron b. the mass of one helium-4 atom c. the mass of one carbon-12 atom d. one-twelfth the mass of one carbon-12 atom

A sample of fuel is found to contain 87.4% nitrogen and 12.6% hydrogen. if the molecular mass of the fuel is 32.05 grams/miles, what is the molecular formula of the fuel?

Got it on my own so I deleted the original

Which of the following groups contain three elements with stable electron configurations? a. lithium, krypton, argon b. argon, neon, barium c. xenon, neon, boron d. helium, xenon, neon

The correct electron configuration for Mn is Question 4 options: 1s22s22p63s63d2 1s22s22p63s23p64s24p5 1s22s22p62d103s23p3 1s22s22p63s23p64s23d5

In a solution of sugar, we used 500ml to make 50g/l solution. How much sugar was used?

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.