Fe³⁺ +e⁻ -> Fe²⁺ is the half reaction equation represents the reduction of an iron(II) ion
When an element or a compound gain electron , decreasing its oxidation number is called reduced and the half cell reaction is called Reduction reaction.
Fe³⁺ +e⁻ -> Fe²⁺ , Option C
In this reaction the Iron is gaining electron and the charge is getting reduced from +3 to +2 .
Therefore this half reaction equation represents the reduction of an iron(II) ion.
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b. 0 °C
c. 100 °C
d. 120 °C
Chromium-50 has 26 neutrons, chromium-52 has 28 neutrons, and chromium-53 has 29 neutrons.
Chromium has an atomic number of 24, which means it has 24 protons. To determine the number of neutrons in each chromium isotope, subtract the atomic number from the mass number. For chromium-50, subtracting 24 from 50 gives you 26 neutrons. For chromium-52, subtracting 24 from 52 gives you 28 neutrons. And for chromium-53, subtracting 24 from 53 gives you 29 neutrons.
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b. Catalysts are always formed by chemical reactions.
c. Catalysts are used up during a chemical reaction.
d. Catalysts lower the activation energy of a chemical reaction
B. calcium
C. rhodium
D. chlorine
Answer:
Calcium
Explanation:
Calcium is needed in our body to make bones (skeletal system) and teeth strong. Apart from making bones and teeth strong, it is required in other body functions such as:
Enabling blood to clot
Helping in muscle contraction
Helping heart muscle in maintaining normal heart beat
About 99% of calcium present in the body is stored in bones. Calcium is stored in bones in the form of calcium phosphate.
Bones continuously replace old calcium with new one. Calcium is not produced in our body. It comes from daily diet, therefore, it essential to take calcium rich diet.
Answer:
the same number of electrons in their outermost shells
Explanation:
On the periodic table, elements in the same column have the same number of electrons in their outermost shells (also known as valence electrons), and hence, are said to belong to the same group.
Similarly, elements on the same row in the periodic table have the same number of atomic orbitals and are said to belong to the same period.
The elements in each column have the same number of electrons in their outermost shells.
Elements are defined as the substances in chemistry that can not be broken down by any further chemical reaction.
Typical examples of elements include: oxygen, hydrogen,Helium, calcium, potassium, iron, Chlorine.
These elements are arranged in columns and the rows of the periodic table according to their atomic numbers.
The elements in each column have the same number of electrons in their outermost shells.
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