Copper reacts with concentrated nitric acid. Cu(s) + + 4HNO3(aq) + Cu(NO3)2(aq) + 2NO2(9) + 2H2O(1)
An excess of copper is added to 25.0 cm3 of 16.0 mol/dm3 HNO3.
Use this information, together with the equation above, to calculate the volume of NO, formed.
The gas volume is measured at room temperature and pressure.

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 6 b) 8 c) + 1 d) 12 e) 18

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products