Given the following chemical reaction: 2 O2 + CH4 - - > CO2 + H2O

What mass of oxygen is required to completely react with 20 grams of CH4?

A) 10 grams O2

B) 20 grams O2

C) 80 grams O2

D) 144 grams O2

How do scientists determine the number of neutrons in an isotope of an atom? A. They find the number of protons. B. They divide the atomic mass by two. C. They add the number of electrons and protons. D.

Why do plants need to obtain carbon atoms

What common characteristic is generally shared by the elements at the center of a period?

Which of these scientists diagnosed smallpox and measles? A. Nicolaus Copernicus B. Al-Razi C. Archimedes D. Rosalind Franklin

There are around muscles in the human body 640 250 100

A diatomic gas has the molar mass of 38.00g/mol. what is the possible formula?

Which of the following is the final concentration of KCl if 500 ml of 0.25 M KCl is diluted to a final volume of 5 L? 0.025 L 0.0025 L 25 L 2.5 L

What do you use to measure mass

A salt shaker filled with 17.0g sodium chloride contain how many moles?

When a radioactive decay occurs what is released? A. Only protons and neutrons B. Only electrons C. Protons/Neutrons, beta particle, gamma ray D. Only gamma rays