Answer:
The correct answer is Magnesium (Mg)
Answer:
Explanation:
Radioactive decay follows the equation:
Ln [A] = -kt + ln [A]₀
<em>Where [A] is amount of isotope after time t: Our incognite,</em>
<em>k is rate constant: ln 2 / Half-life = 0.0231 years⁻¹</em>
<em>t are 60 years</em>
<em>[A]₀ is initial amount of isotope: 1.0g</em>
<em />
Replacing:
Ln [A] = -kt + ln [A]₀
Ln [A] = -0.0231 years⁻¹*60 years + ln 1.0g
ln [A] = -1.386
[A] = 0.25g
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The answer is:
E per gram = 0.45 V
The explanation:
when MnO2 is the substance who oxidized here so, the oxidizing agent and the anode here is Li.
and when the molar mass of Li is = 7 g/mol
and in our reaction equation we have 1 mole of Li will give 3.15 V of the electrical energy
that means that :
7 g of Li gives → 3.15 V
So 1 g of Li will give→ ???
∴ The E per gram = 3.15 V / 7 g of Li
= 0.45 V
As a block slides down a ramp the potential energy is transformed into kinetic energy.
If there is not friction between the ramp and the block that is the only conversion occurring.
If there is friction some potential energy will be converted into thermal energy (heat) and sound.
Also, if there is any kind of interaction between the block and other object some other kind of energies can be otained.
That is all what can be said without a figure that shows other specific condition that implies another conversion of energy.
Answer:
A = 2s²
B = 2p⁴
or 2s² 2p⁴
Explanation:
Oxygen:
It is the eighth element of periodic table. It is present in group sixteen and second period of periodic table. It has six valance electrons. It is also called chalcogen because it is ore forming element. its atomic number is 8.
Electronic configuration:
O₈ = 1s² 2s² 2p⁴
The two electrons in 1s shell represent the core electrons while the six electrons in second shell are valance electrons.
Valance shell electronic configuration :
2s² 2p⁴
