Protons are made up of up quarks and one down quark

The reaction q+r2=r2q is found to be first order in r2 and

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

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring