1. acids are substances that produce hydrogen ions (h+) when dissolved in water. lemon juice is an example of an acid. a. what does lemon juice taste like? b. what does it feel like if lemon juice gets in your eye? 2. bases are substances that produce hydroxide ions (oh-) when dissolved in water. hand soap is an example of a base. a. what does soap feel like? b. what does soap taste like? c. what does it feel like if soap gets in your eye?

i think it is true since you can test the answer and can use observations to complete it.

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

a is the correct answer