PLEASE HELP complete the following table for the reactions that occur when black powder is ignited

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

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

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?