Answer:
The half life of element XY is 12 days
Explanation:
Given:
Time taken for 1024 grams to decay into 32 grams = 60 days
To Find:
The half life of element XY = ?
Solution:
The Half life is calculated by
=
Substituting the values,
=
=
=
= 12
Here, I took this straight from the notes I took back when I learned this. If you need any more clarification, just say so.
<span>Bohr: Planetary model<span>Theorized that E- travel in specific orbits around the nucleus.The further an E- is from the nucleus, the higher its “energy.”The number of E- in the outermost orbital<span> determines the reactivity of an element.</span>
Bohr's model was a nucleus with concentric circles going around it representing the energy levels (where the electrons are in the atom). He was the first to demonstrate that the electrons in an atom orbit the nucleus, rather than stay in a consistent position. Google "Bohr Atomic Model" if you need any visual clarification. Hope I helped, and let me know if you need anything else!</span></span>
Hydrocarbon, to my knowledge is an organic compound consisting mainly of hydrogen and carbon. It is mainly found in petroleum and natural gas. Hope this helps!
Answer:
17.03Pa
Explanation:
Given parameters:
Initial volume = 15.5kL
Final volume = 6kL
Final pressure = 44Pa
Unknown:
Original pressure = ?
Solution:
The parameters given shows pressure and volume relationship of the given gas. One of the gas laws that predicts pressure - volume relationships is the Boyle's law.
Boyle's law states that "the volume of a fixed mass of gas varies inversely as the pressure changes, if the temperature is constant".
Mathematically,
P₁V₁ = P₂V₂
where P₁ is the initial pressure
V₁ is the initial volume
P₂ is the final pressure
V₂ is the final volume
Input the variables and solve for P₁;
P₁ x 15.5 = 44 x 6
P₁ = 17.03Pa
