Answer:
[(x-37.5)/x]*100%
62.5% (assuming the original sample weighs 100.0g)
Explanation:
Let's say that the original sample is x
Mass of I-125 which has decayed: x-37.5
Percentage of decayed mass: [(x-37.5)/x]*100%
Please recheck, for this may not be the correct answer
Lets let our mass equal 3 on alletals and solve using d=m/v equation
Aluminum
V=3/2.70=1.11
Silver
V=3/10.5=.286
Rhenium
V=3/20.8=.144
Nickel
V=3/8.90=.337
This gives us the following list from largest to smallest Aluminum, Nickel, Silver, and Rhenium
Answer: All of the statements (A-D) are false
Explanation: All of the given statements are wrong as Hydrogen bonds are weaker than the ionic and the covalent bonds.
Liquid water is more dense than the solid water.
When heat or temperature is provided to the system of the ice, not only covalent bonds are broken but also hydrogen bonds also get broke.
Energy must not be given off in order to break down the crytsal lattice of ice to a liquid. Infact in changing the phase of the water, energy is released.
