Are these physical change or chemical change? Prompt 1iron chain rusting over a long period of time

Answer for prompt 1 iron chain rusting over a long period of time

Prompt 2a piece of paper burning

Answer for prompt 2 a piece of paper burning

Prompt 3peach spoils by bacteria and rots

Answer for prompt 3

peach spoils by bacteria and rots

Prompt 4glue gun melts a glue stick

i believe the answer is true.

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