<span>1.Which best explains why ionization energy tends to decrease from the top to the bottom of a group?
D.Electrons get farther from the nucleus. </span>They experience a weaker attraction to the positive charge of the nucleus.<span>
3.When electrons are removed from the outermost shell of a calcium atom, the atom becomes
D. a cation that has a smaller radius than the atom. </span><span>Since the atom is losing an electron, it not only becomes positively charged, also the effective nuclear charge diminishes making the remaining electrons aproach the nucleus.</span>
Answer:
a) Higher than −34 °C because dispersion forces are stronger in iodine due to a greater number of electrons.
Explanation:
Both chlorine and Iodine are halogens. They belong to the 7th group on the periodic table.
To examine the trend of boiling point in this group we must consider the nature of the intermolecular bonds that would be formed by the molecules of these elements. We know that London dispersion forces, a type of van der Waals attraction would be more prevalent. This is so because the molecules here would be non-polar and the uneven distribution of the constantly moving electrons would initiate the intermolecular bonding.
The uneven charge distribution leads to the formation of a temporary dipole.
This makes boiling point increase down the group because more electrons becomes involved and the bond becomes stronger.
The balanced skeleton reactions are given below
2CrO₄²⁻(aq) + 3Cu(s) +8(l) → 2Cr(OH)₃(s) + 3Cu(OH)₂(s) + 6(aq)
The oxidising agent and reducing agents are Cr and Cu .
There are following steps involve in balance redox reaction in basic medium .
- First divide the reaction into two half reactions which give oxidation and reduction half reaction.
- Then balance the elements other than oxygen and hydrogen atom.
- Balance the oxygen atom by adding where number of oxygen is less .
- Balance the hydrogen atom by adding on another side of where water molecule added.
- Add ions to both sides to neutralize ion.
- Combine and ion to make .
- Balance the charge by adding .
The species which reduces the other species in the redox reaction is called oxidizing agent . Similarly , the species which oxidize the other species in the redox reaction is called reducing agent .
To learn more about reducing agents please click here ,
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Explanation:
Compounds are the species in which all the components react chemically to form a molecule which has a different property from the constituting elements.
On the other hand, mixture are the species in which the components do not react chemically and the original properties of the components are not lost.
<u>Thus, separation of the mixture into its components can be done by the physical means while separation of the compound into its components can be only possible by the chemical means.</u>
A compound is a substance formed when two or more chemical elements are chemically bonded together