Which of the following pairs of samples would have different half-lives? a Sample A: Radon-214 at 100 degrees Celsius Sample B: Radon-214 at 500 degrees Celsius b Sample A: Carbon-14 being held still Sample B: Caron-14 being shaken vigorously c Sample A: Uranium-235 in a nuclear reactor Sample B: Uranium-238 in a nuclear reactor d Sample A: Potassium-40 found in a banana Sample B: Potassium-40 found in a metal deposit

they are made of gases.

they have a spherical shape.

they make energy through fusion.

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

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.