4. A scientist combines 14 grams of potassium nitrate with an unknown
amount of potassium chloride. If the total mass of the products is 27.6 grams,
what was the mass of the potassium chloride?

it doesn't. it was imagined up in the middle ages.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.