Six students were asked to perform an experiment to see how the mass of a pendulum affected its period. they were given supplies and asked to design an experiment to test the impact that the mass of the bob had on period. what would likely make their results more reliable?

a) if each student was given different equipment.
b) if a set procedure was followed by all of the students.
c) if each student was given the same hypothesis to prove.
d) if the student all perform the investigation on the same day.

I know it's B because if a set procedure was followed by all of the students, this would improve the reliability of results.

answer; i believe the correct answer is (c) /// is a homogeneous mixture of gaseous substance nitrogen,oxygen and smaller amounts of other substancesmixtures can be either ( homogeneous or heterogeneous)plz check first good luck

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2