<u>Answer</u>:
By tracking oxidation numbers we can identify the number electron in the atom
<u>Explanation</u>:
Tracking of electrons helps us to know when and how many electrons get transferred from one atom to other atom . Oxidation referred as the “loss of one or more electrons” by an atom. When the oxidation number of an element increases, there is a loss of electrons and that element is being oxidized. Oxidation numbers are usually written with the sign (+plus or −minus) followed by the magnitude, which is the opposite of charges on ions. In their elemental stage oxidation number of an atom is zero.
Answer:
atoms of Ca.
Explanation:
Basic stoich question:
First the reaction is 
Converting grams to moles: 
Notice the mole ratio. For every 2 Ni produced, 3 Ca was used.
of Ca.
There are 
atoms in a mole.
Thus, multiplying them together = atoms
Answer: Option (d) is the correct answer.
Explanation:
A solute is defined as a substance which is present in small quantity into a solvent. Whereas a solvent is defined as the substance present in large amount as compared to a solute into a solution.
Therefore, always a solute tends to dissolve in solvent and never ever a solvent dissolves in a solute.
It is true that solutions can be made of liquids and solids, liquids and liquids, or gases and liquids. As a solution is a physical combination of two or more same or different states of matter.
Thus, we can conclude that out of the given options in a solution, the solvent is dissolved into the solute, this statement is incorrect.
Both too much and too little intake of zinc can impair the immune function. In addition to this, high intake of zinc can lessen the absorption of both iron and copper which are two of the most essential minerals needed by the human body.
Based on this:
<span>High zinc intakes can inhibit the absorption of copper is a true statement.</span>
In one H₂O molecule, there are two hydrogen atoms along with one oxygen atom. So for every 1 oxygen atom (of which there are 2 of in an oxygen gas molecule) there needs to be 2 hydrogen atoms per oxygen( which in the equation of 2H2 +O2–> 2H2, that 2 H2 is broken down into 4 hydrogen atoms which means 2 hydrogen atoms have to bond to 1 oxygen atom and with 4 hydrogen atoms, there will be 2 atoms of oxygen which creates 2 molecules of water.
So to solve the question,
10.5g/2=5.25g of oxygen required to fully react with hydrogen to make water
