Which one of the following describe chemical properties? check all that apply. -water freezes at 0 degrees c. -sugar burns in air to form water and carbon dioxide. -mercury is a liquid at room temperature . -helium is the lightest monatomic element

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom

Based on the equation and the information in the table, what is the enthalpy of the reaction?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6