Question 2(multiple choice worth 3 points).
(01.04 mc)
what is generally true about the compressibility of solids?
this higher than the compressibility of gases and liquids.
it is lower than the compressibility of plasmas and gases.
it is higher than the compressibility of plasmas, but not of other phases.
it is lower than the compressibility of liquids, but not of other phases.
question 3 multiple choice worth 3 points)
(01.04 mc)
refer to the measurements in the table to determine which unidentified metal has the lowest density.
metal volume mac

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

wher is the rest of the question

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