On a x-y graph of volume (x-axis) and mass (y-axis), the slope of the line represents

According to the loco mass the mass of reactants and products

Which of the following is an oxidation-reduction reaction? (pictured below)

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?