Answer:
O(Oxygen)
Explanation:
2+2+4=8
And the eighth element of the periodic table is Oxygen
Yes, as the strongest of the species continue to survive (which is what natural selection is all about) they can mutate causing improved features and eventually new species (note that this happens over hundreds of thousands of years.
An example is the giraffe. It evolved from a type of horse who’s neck wasn’t long enough to reach the leaves on trees. Therefore, those born with longer necks were more likely to live, and the process of natural selection helped form giraffes as we know them today.
Answer: Option (d) is the correct answer.
Explanation:
When we dissolve an ionic compound in water then it readily dissociates into ions.
This is because ionic compounds are polar in nature and like dissolves like. Since, water is also polar in nature hence,
For example, NaF is an ionic compound as it is formed by transfer of an electron from sodium atom to fluorine atom.
So, when NaF is dissolved in water then it dissociates into and ions.
As electric current occurs due to movement of electrons or ions. Therefore, a solution with and ions is able to conduct electricity.
Thus, we can conclude that if you want to conduct an electrical current, then dissolving solid NaF in water would produce a solution capable of this.
Answer:
1.55 x 10²⁴ formula units
Explanation:
Given parameters:
Number of moles of CaCl₂ = 2.58moles
Unknown:
Formula units in the compound = ?
Solution:
To solve this problem, we must understand that;
1 mole of a substance contains 6.02 x 10²³ formula units
2.58 moles will contain 2.58 x 6.02 x 10²³ formula units
= 1.55 x 10²⁴ formula units
Chemistry is a subject of love❤❤❤❤❤