The atomic mass of carbon-13 is 13. It has six protons. How many neutrons does this isotope have? 6 7 13 19

A sample of neon has a volume of 75.8 L at STP. Calculate the number of moles

Compare and contrast a chemical reaction and a nuclear reaction.

How to convert 157 cs to seconds

Which statement regarding nuclear and chemical reactions is not true? A. Chemical reactions involve electrons. B. Only chemical reactions produce stable atoms C. Nuclear reactions release more energy per mole D.

Methane burns in oxygen to produce carbon dioxide and water. Which of the following represents a preliminary, unbalanced equation with the correct chemical formulas? 1. CH4 + O2 → CO2 + H2O 2. CH4 + CO2 → O2 + H2O 3. CO2 + H2O → CH4 + O2 4.

True or false. elements in the same period have the same number of valence electrons

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

Which of these is an indicator that a chemical reaction has occurred? precipitate forms temperature remains the same color is diluted mass increases

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay

A 69.1-g sample of h2o contains how many molecules of water?