Arunner starts at point a, runs around a 1-mile track and finishes the run back at point a. which of the following statements is true?

a. the runner's displacement is 1 mile.
b. the runner's displacement is zero.
c. the distance the runner covered is zero.
d. the runner's speed was zero.

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance