Science. Grade 5. My little sister needs help. A scientist analyzes the data and information from an experimental investigation he conducted and realizes his hypothesis is wrong.

Which choice best explains why his evidence is valuable?

The scientist should share his empirical observations so other scientists can also learn from his experimental investigation.

The scientist should write a conclusion in his science notebook using his empirical observations and keep the results to himself.

The scientist should consider changing his empirical observations so his hypothesis is more correct than incorrect.

The scientist should consider changing the area of science in which he is working because he may be more successful in another field of study.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

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