Exit Ticket - Formative Assessment 6.8ACD (9 questions) 7 of
Danielle has a rubber band. She stretches the rubber band with her fingers. After
she releases the rubber band, it flies through the air.
stretched rubber band
released rubber band
Which of the following is true about the energy of the rubber band?
The stretched rubber band has more kinetic energy, and the released rubber band has more potential energy.
Both the stretched rubber band and the released rubber band have only kinetic energy.
Both the stretched rubber band and the released rubber band have only potential energy.
The stretched rubber band has more potential energy, and the released rubber band has more kinetic energy.
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nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

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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