Answer:
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First, we have to know the formula of each of the substances:
calcium nitrate: Ca(NO₃)₂
ammonium fluoride: NH4F
calcium fluoride: CaF2
dinitrogen monoxide: N2O
water: H2O
Next, we write the unbalanced reaction. We look at each element and count the number per side. The side with the less number of that element should get a coefficient to balance.
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The viscosity of water will decrease as it is directly related to intermolecular forces and when intermolecular forces decrease viscosity decreases.
Because they have a full outer shell and they are both noble gases...Because the outer shell has attained stable electronics configuration of octate rule this it is with noble gas as helium.
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The general equation for radioactive decay is;
N = N₀e^(-λt)
x - decay constant (λ) - rate of decay
t- time
N - amount remaining after t days , since we are calculating the half life, amount of time it takes for the substance to to be half its original value, its N₀/2
N₀ - amount initially present
substituting the values
N₀/2 = N₀e^(-0.081t)
0.5 = e^(-0.081t)
ln (0.5) = -0.081t
-0.693 = -0.081t
t = 0.693 / 0.081
= 8.55
half life of substance is 8.55 days