Answer:
Option d is correct = Negative ion
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg
. While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
When an atom gain electron negative charge increase because of more number of electron thus atom form negative ion or anion. For example,
Anion formation:
X + e⁻ → X⁻
Cation formation:
X → X⁺ + e⁻
Thus option d is correct option.
Explanation:
The volume of the copper block is:
The density of copper is 8.96 g/cm³
So the mass of the copper block is
or 126.44352 kg.
Answer:
B. Peer review
Explanation:
Peer review ensures that the results of an experimental procedures are consistent are reliable and they meet their objective statement.
When peers which are professionals in a field of study subjects the results from an experiment into a test, they can give their own verdict as to wether such findings are consistent and reliable with the problem in view.
<u>Answer:</u> The cell potential of the above reaction is 0.52 V
<u>Explanation:</u>
The given chemical equation follows:
<u>Oxidation half reaction:</u> 
<u>Reduction half reaction:</u> 
To calculate the EMF of the cell, we use the Nernst equation, which is:
![E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Zn^{2+}]}{[Pb^{2+}]}](https://tex.z-dn.net/?f=E_%7Bcell%7D%3DE%5Eo_%7Bcell%7D-%5Cfrac%7B0.059%7D%7Bn%7D%5Clog%20%5Cfrac%7B%5BZn%5E%7B2%2B%7D%5D%7D%7B%5BPb%5E%7B2%2B%7D%5D%7D)
where,
= electrode potential of the cell = ? V
= standard electrode potential of the cell = 0.63 V
n = number of electrons exchanged = 2
![[Zn^{2+}]=1.0M](https://tex.z-dn.net/?f=%5BZn%5E%7B2%2B%7D%5D%3D1.0M)
![[Pb^{2+}]=2.0\times 10^{-4}M](https://tex.z-dn.net/?f=%5BPb%5E%7B2%2B%7D%5D%3D2.0%5Ctimes%2010%5E%7B-4%7DM)
Putting values in above equation, we get:
Hence, the cell potential of the above reaction is 0.52 V
homeostasis means "steady state". Homeostasis describes how the body regulates its process to keep its internal conditions as stable as possible. Homeostasis is necessary because human cells are efficient but very demanding.
